Self-Assigned IP Addresses?

Hello everyone! I have 76 various Mac workstations and 6 Window machines. 4 of my Mac workstations and 1 of my Windows workstations have self-assigned IP addresses. I have tried to add a static IP which then claims I am connected but not able to get on the internet. I have spoken to Apple Tech Support who suggested to format the hard drive and install a fresh OS; there are many chats on their community page with suggestions on how to fix this but none of them have worked for me. Same with SW as other persons have had this issue come up - none of their answers applied to my issue. One of these 4 is brand new out of the box and the other 3 are within 5 years of age. Formatting is not an option. These machines are located throughout - various departments and on different floors. Some of the departments have a home run right back to the server; some go through an unmanaged 8 port switch that I installed which then home runs to the server.  If I add them to our wifi system - no problems as I can connect wirelessly. As soon as I turn off their wifi the ethernet goes back to a self-assigned IP address. Any advice would be very much appreciated as I want all of my workstations to be hard wired. 

User: Server Admin

How to Build a Next Gen Storage Infrastructure

Author Gary Scott

Could be a couple of things,

1  -DHCP has the machine got its IP reserved and it keeps trying ot assign it to the current IP address no matter what you do? Clear it out of the DHCP reservation list then assign it a  manually ip address

2  -The ip address your trying to asdsign the machines, is it alreayd in use or reserved, and thus cannot assign it to the new machines

3  - are you manually settings up the Subnet / GAteway correctly and not just ip address

4 - you could manually assign the machines to ip / subnet / gateway, then flush dns / or flush dns then assignt he information

5 whilst on autopmatic, ipconfig /release and before doing renew manually assign it (windows machines, dont know about macs)

These are just some suggestions that i would try but re-formatting seems  a lazy dont have a clue answer to most things

Author Robert Miller

Just because you give a computer a static IP address doesn't mean it can access the internet for various reasons 

Author Peter Lapetina

Is there a specific reason for self assigned IP? If you can, have your tried connecting those machines using DHCP? If DHCP is working, then your configuration for self assigned needs to be looked into.

Author David Lloyd-Williams

If you really need to have certain computers to have known IP addresses, then I suggest that you set up DHCP to assign the IP addresses to the MAC address of the computers.

Author Kevin Hughes

When you say “self-assigned” - do you mean APIPA (starting with 169.254)?

What happens if you move the problem child to a different wired LAN segment?

I’d also look at the DHCP server to see if the problem children’s MAC addresses have somehow ended up on the deny list.

Author Server Admin

@lapetinap - I am not trying to self-assign these machines - these machines are self-assigning themselves 169.254.... I would prefer to give them a static IP address or let the DHCP server assign them an address within our range of 10.0.1...

@rockin - 90% of my equipment have static ip addresses ranging from 10.0.1.1/255 - which is less than 200 devices. 

@davidlw - I will try that idea. It will take some time as I have 76 machines but I could just start with my problem workstations first, or do I have to do all of them at once in order to be effective? 

@GScott-UK - 

1 -DHCP has the machine got its IP reserved and it keeps trying ot assign it to the current IP address no matter what you do? Clear it out of the DHCP reservation list then assign it a manually ip address - A: I will try this.  

2 -The ip address your trying to asdsign the machines, is it alreayd in use or reserved, and thus cannot assign it to the new machines - A: I have specific IP addresses set aside for each department so there isn't any already being used. 

3 - are you manually settings up the Subnet / GAteway correctly and not just ip address - A: I have tried both with and without. 

4 - you could manually assign the machines to ip / subnet / gateway, then flush dns / or flush dns then assignt he information - A: I have not flushed the dns so I will try this.

5 whilst on autopmatic, ipconfig /release and before doing renew manually assign it (windows machines, dont know about macs) A: I will try this. 

@kevinhughes2 - 

When you say “self-assigned” - do you mean APIPA (starting with 169.254)?  Yes - exactly.

What happens if you move the problem child to a different wired LAN segment? A:  I will try this

I’d also look at the DHCP server to see if the problem children’s MAC addresses have somehow ended up on the deny list. A: I will look into this.  

A 169 address would indicate that they cannot contact a DHCP server so they get an APIPA address.

@rockn: I agree. What I don't understand is why. I'm thinking to unjoin the domain and rejoin it again in hopes it will contact the DCHP server. All the workstations around him have no issues and they all home run to the server. 

Have you tried to connect the PCs to a known working LAN port with a known good Cat 5 patch lead ? It sounds like the LAN just isn’t connecting or seeing the network. You might want to check the settings on the port - are they set to auto negotiate, or are they stuck at a single speed full duplex ? Check on the PC and also the switch. With regards your question if you have to convert all PCs over to DHCP assigned - no, do them one at a time, just make sure the DHCP pool doesn’t conflict with other static IPs on the network.

Is the NIC internal or expansion card? One possibility is that the TCPIP stack is corrupt. Try removing the network configuration an allow the machine to find it anew and reload the drivers, or if it is an internal NIC, disable it and install a new NIC an allow the system to find it. If you are using known good cable(s) and ports on a switch, then the probable problem is with the NIC or the NIC's drivers.

Going back to this (sorry it took so long but I'm a one-man department) it turned out to be a broken wire somewhere between the server room switch and the actual port. I appreciate all the help that was offered and it's amazing how you all hopped on and tried to fix this this with me as well. Stay safe and healthy! 

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How To Fix Internet Not Working Due To Self-Assigned IP Address Issue

self assigned ip example

If your Mac is connected to a working Wi-Fi network but the Internet is still not working, then we have got the solution for you. A lot of times your Mac is issued a self-assigned IP, which causes the Internet to not work on the machine.

Despite the same Wi-Fi network working on other devices, the Mac will simply show no internet connection error and Internet will not work on it. In these situations Wi-Fi has the self-assigned IP address and will not connect to the Internet despite the Internet working on other devices.

On Mac’s Wi-Fi page the Wi-Fi will also show the Self-Assigned IP Address text instead of connected. This is a very annoying problem that can cause Internet to not work on your Mac. Not having a working Internet connection on your Mac due to Mac’s self assigned IP problem can prevent you for doing work and render your Mac useless.

Good thing is self-assigned IP issue on Mac is quite easy to solve. You can fix the self-assigned IP address issue and get the Internet to work again on your Mac by simply deleting a few files on your machine.

Simply follow the steps below from an administrator account and put the mentioned files in trash.

This solution works on all recent versions of macOS including macOS Ventura, macOS Monterey, macOS Big Sur and macOS Catalina.

Fix Self-Assigned IP Address Issue on Mac

You can use to solve the self-assigned IP address issue on your Mac running macOS Ventura, macOS Monterey, macOS Big Sur, macOS Catalina etc.

1. On your Mac launch finder and click on Macintosh HD. (Don’t see Macintosh HD? See here )

2. Click on the Library folder and go to Preferences.

3. Now click on the SystemConfiguration folder.

4. Next put the following files in trash.

  • com.apple.airport.preferences.plist
  • com.apple.network.identification.plist
  • NetworkInterfaces.plist

5. Restart your Mac.

Once the reboot has taken place the Internet will start working and self assigned IP address issue will be resolved.

If you don’t see all the files mentioned above, then just delete the ones that are present and reboot your machine.

How to Reset Mac’s IP address

In case you’re looking to reset your Mac’s IP address to solve internet connection problems with your computer, then the following instructions will help. If deleting the files mentioned above does not help, then the steps to reset Mac IP address can also prove helpful in fixing self-assigned IP Mac problem.

On macOS Ventura or later

Below you can find instructions on how to reset Mac IP address if you are running macOS Ventura or later.

1. Click on the Apple logo from the top menu bar and then click on System Settings .

2. Now click on Wi-Fi option from the side pane.

3. Make sure your Mac is connected to your Wi-Fi network. Then click on ‘ Details… ‘ located next to Wi-Fi’s name.

4. Now click on TCP/IP button from the left side pane.

5. Next find the ‘ Renew DHCP Lease ‘ button on the right side of the window and click on it.

6. Click on OK button and using the toggle next to Wi-Fi turn off Wi-Fi and turn it back on after a few seconds.

By performing these steps you should be able to solve self-assigned IP issue on your Mac and Internet should start working once again.

On macOS Monterey or earlier

Here’s how you can reset Mac IP address if you are running macOS Monterey or earlier on your Mac.

1. On your Mac open System Preferences.

2. Click on Network icon.

3. Make sure Wi-Fi is selected from the side pane and then click on ‘Advanced’ button.

4. Now click on TCP/IP from the top navigation bar.

5. Next click on ‘Renew DHCP Lease’ button.

6. Click OK to exit and from the top menu click on the Wi-Fi button and turn off Wi-Fi.

7. After a few seconds turn Wi-Fi back on and connect your Mac to your Wi-Fi network.

8. At this point Self-Assigned IP address issue should get solved and Internet should start working again.

There you have it, this is how you can easily and quickly fix Self-Assigned IP address issue on Mac and get your Internet connection working once again. If you have any questions regarding this tutorial, then feel free to let us know in the comments section below.

  • troubleshooting

self assigned ip example

Hello I recently instakked BIG SUR on my late 2013 macbook pro and I am having trouble tethering my Iphone XR to it. I can tether using wifi, but when I attempt to tether using bluetooth, my phone shows as connected in bluetooth preferences on my macbook and iphone, with the connection/link symbol shown on my iphone, but the internet will not work. In Network the bluetooth Pan shows an orange dot, STATUS: CONNECTED, but underneath it says ‘internet-not-working-self-assigned-ip-address-issue’. Do you have any ideas on how to fix this, I followed your instructions from the link ( https://ioshacker.com/how-to/fix-internet-not-working-self-assigned-ip-address-issue ) on your website, but each time I restart the computer the files that I put into the trash and delete from the trash re-appear in the system configuration folder. Only 2 of the 3 files you suggested to trash are in the folder, – com.apple.network.identification.plist – is not in the folder. Any advice appreciated.

I’m running Monterrey on my MacBook Pro and was having problem with the self-assigned IP and cannot connect to the Internet. I followed what your article suggested, several times, but was still unable to resolve the problem. Are there other suggestions that you think I should try? Thank you.

I just had the same issue and none of the fixes found online worked. I have McAfee Security software installed and there was a service running called McAfeeSystemExtensions. I deactivated the service within the Network settings and problem resolved.

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Self IP Addresses

Applies to:.

  • 11.5.10 , 11.5.9 , 11.5.8 , 11.5.7 , 11.5.6 , 11.5.5 , 11.5.4 , 11.5.3 , 11.5.2 , 11.5.1

BIG-IP Link Controller

Introduction to self ip addresses.

A self IP address is an IP address on the BIG-IP ® system that you associate with a VLAN, to access hosts in that VLAN. By virtue of its netmask, a self IP address represents an address space , that is, a range of IP addresses spanning the hosts in the VLAN, rather than a single host address. You can associate self IP addresses not only with VLANs, but also with VLAN groups.

Self IP addresses serve two purposes:

  • First, when sending a message to a destination server, the BIG-IP system uses the self IP addresses of its VLANs to determine the specific VLAN in which a destination server resides. For example, if VLAN internal has a self IP address of 10.10.10.100 , with a netmask of 255.255.255.0 , and the destination server’s IP address is 10.10.10.20 (with a netmask of 255.255.255.255 ), the BIG-IP system recognizes that the server’s IP address falls within the range of VLAN internal’s self IP address, and therefore sends the message to that VLAN. More specifically, the BIG-IP system sends the message to the interface that you assigned to that VLAN. If more than one interface is assigned to the VLAN, the BIG-IP system takes additional steps to determine the correct interface, such as checking the Layer2 forwarding table.
  • Second, a self IP address can serve as the default route for each destination server in the corresponding VLAN. In this case, the self IP address of a VLAN appears as the destination IP address in the packet header when the server sends a response to the BIG-IP system.

You normally assign self IP addresses to a VLAN when you initially run the Setup utility on a BIG-IP system. More specifically, you assign one static self IP address and one floating self IP address to each of the default VLANs (internal and external). Later, using the BIG-IP Configuration utility, you can create self IP addresses for other VLANs that you create.

Self IP addresses reside in administrative partitions/folders and are associated with traffic groups. The self IP addresses that you create when you run the Setup utility reside in partition Common (that is folder /Common ).

Types of self IP addresses

There are two types of self IP addresses that you can create:

  • A static self IP address is an IP address that the BIG-IP ® system does not share with another BIG-IP system. Any self IP address that you assign to the default traffic group traffic-group-local-only is a static self IP address.
  • A floating self IP address is an IP address that two BIG-IP systems share. Any self IP address that you assign to the default traffic group traffic-group-1 is a floating self IP address.

Self IP addresses and MAC addresses

For each self IP address that you create for a VLAN, the BIG-IP ® system automatically assigns a media access control (MAC) address.

As an alternative, you can globally configure the BIG-IP system to assign the same MAC address to all VLANs. This feature is useful if your network includes a type of switch that does not keep a separate Layer 2 forwarding table for each VLAN on that switch.

Self IP addresses for SNATs

When you configure the BIG-IP ® system to manage local area traffic, you can implement a feature known as a secure network address translation (SNAT). A SNAT is an object that causes the BIG-IP system to translate the original source IP address of a packet to an IP address that you specify. A SNAT ensures that the target server sends its response back through the BIG-IP system rather than to the original client IP address directly.

When you create a SNAT, you can configure the BIG-IP system to automatically choose a translation address. This ability of the BIG-IP system to automatically choose a translation address is known as SNAT automapping , and in this case, the translation address that the system chooses is always an existing self IP address. Thus, for traffic going from the BIG-IP system to a destination server, configuring SNAT automapping ensures that the source IP address in the header of a packet is a self IP address.

When you create an automapped SNAT, the BIG-IP system actually creates a SNAT pool consisting of the system’s internal self IP addresses, and then uses an algorithm to select and assign an address from that SNAT pool.

Self IP address properties

It is when you initially run the Setup utility on a BIG-IP ® system that you normally create any static and floating self IP addresses and assign them to VLANs. However, if you want to create additional self IP addresses later, you can do so using the BIG-IP Configuration utility.

A self IP address, combined with a netmask, typically represents a range of host IP addresses in a VLAN. If you are assigning a self IP address to a VLAN group, the self IP address represents the range of self IP addresses assigned to the VLANs in that group.

When you specify a netmask for a self IP address, the self IP address can represent a range of IP addresses, rather than a single host address. For example, a self IP address of 10.0.0.100 can represent several host IP addresses if you specify a netmask of 255.255.0.0 .

VLAN/Tunnel assignment

You assign a unique self IP address to a specific VLAN or a VLAN group:

The VLAN/Tunnel list in the BIG-IP Configuration utility displays the names of all existing VLANs and VLAN groups.

Port lockdown

Each self IP address has a feature known as port lockdown. Port lockdown is a security feature that allows you to specify particular UDP and TCP protocols and services from which the self IP address can accept traffic.

You can determine the supported protocols and services by using the tmsh command tmsh list net self-allow defaults .

If you do not want to use the default setting ( Allow None ), you can configure port lockdown to allow either all UDP and TCP protocols and services ( Allow All ) or only those that you specify ( Allow Custom ).

Traffic groups

If you want the self IP address to be a floating IP address , that is, an address shared between two or more BIG-IP devices in a device group, you can assign a floating traffic group to the self IP address. A floating traffic group causes the self IP address to become a floating self IP address.

A floating self IP address ensures that application traffic reaches its destination. More specifically, a floating self IP address enables a source node to successfully send a request, and a destination node to successfully send a response, when the relevant BIG-IP device is unavailable.

If you want the self IP address to be a static (non-floating) IP address (used mostly for standalone devices), you can assign a non-floating traffic group to the self IP address. A non-floating traffic group causes the self IP address to become a non-floating self IP address. An example of a non-floating self IP address is the address that you assign to the default VLAN named HA, which is used strictly to process failover communications between BIG-IP devices, instead of processing application traffic.

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self assigned ip address mac

How to Fix the Self Assigned IP Address Issue on Mac

At times macOS users face the self-assigned IP address malfunction on their computer. Your Mac will keep alerting you to the ‘internet not working’ pop-up even if you have a Wi-Fi network connection.

It allows the network interface to make a malfunctioning ad-hoc network. There can be many reasons for network issues like a broken cable, DHCP server problem, network location, etc. But, it gets better if you know the correct way to troubleshoot the issue.

Table of Contents

Fixes for the self-assigned IP address issue

Self-assigned IP issues can frustrate users and cause internet issues. But, fret not, you can fix self-assigned IP address malfunction using any of the methods mentioned below:

  • Restart your modem

Before trying any other method to fix the internet issue restart your modem to see if it works. Click the ‘Wi-Fi’ button from the top menu on the Mac to turn it off. Please wait for a few minutes and then turn it back on. Check to see if the issue is fixed.

If this hack works, you will see the Wi-Fi connection running on your Mac with a proper IP address.

  • Re-enable the network preferences

self assigned ip example

To reset network preferences on your computer, follow these steps:

  • Open Mac, launch ‘Finder,’ and in the top menu bar, tap on ‘Go to Folder’ from the drop-down menu of the ‘Go’ bar
  • A new window will appear, type ''/Library/Preferences/SystemConfiguration/'' and press enter
  • The System Configuration window will open. Then delete the following commands: ‘ com.apple .airport.preferences.plist, Networkinterface.plist and preferences.plist’ to reset network configurations
  • Please only delete the files if you have no issue losing the network configuration
  • Please switch off the Mac and then switch it back on; try and link to the Wi-Fi again
  • Open TCP/IP settings again and look for the files that you deleted
  • You will find the removed files back in the old folder

self assigned ip example

  • Renew DHCP lease

One of the most common fixes to the ‘self-assigned IP issue’ is to renew the DHCP lease. A DHCP lease temporarily assigns an IP address to a device connected to the internet.

If the internet connection is malfunctioning, follow these steps to renew your DHCP lease:

  • Tap the Apple logo on the top-left menu bar, then visit the ‘System preferences’ section
  • Then click on ‘Network settings’ and click ‘Advanced’ in the Wi-Fi section
  • Then select the ‘TCP/IP’ section and tap on the ‘Renew DHCP lease’ button and select OK
  • After renewing the lease, check if you can connect to your Wi-Fi

self assigned ip example

  • Make a different network location/ new location

One way to fix self-assigned IP is to set up new network locations on your Mac. Follow the steps below to make a new network location:

  • Tap on the Apple logo from the menu bar and select ‘System preferences’
  • Enter the ‘Network settings’ then tap on ‘Drop-down menu’ near the Location tab
  • Then tap on ‘Edit locations’ and tap on the ‘+’ button and add a ‘new network location’ and tap on done
  • Choose ‘Wi-Fi’ or Ethernet; if not selected automatically
  • Then press on ‘Advanced’ button and again press the ‘Renew DHCP lease button’ and enter
  • This will set a ‘new location’ on the device
  • Reset Firewall

Primarily self-assigned IP address malfunction occurs when the system’s Firewall undergoes configuration problems. If you have performed significant configuration changes on a Mac, settings may not migrate properly. It causes a Firewall issue and might disrupt the network connection.

To fix the firewall configuration issue, follow these steps:

  • Click the ‘Finder’ icon to launch it, then select ‘Go to folder’ in the ‘Go’ menu bar
  • In the pop-up window, enter the following command /Macintosh HD/Library/Preferences/
  • In the new window, delete the ‘com.apple.alf.plist’ command
  • After the Mac restarts, reboot it and check if the Wi-Fi connects

self assigned ip example

Note that after the system boots, you would have to allow connections for the numerous programs temporarily. 

  • Setup the service order in network settings

If your Mac has a self-assigned IP address issue, try resetting the service order of Wi-Fi in the network settings.

To set ‘Service order’ on Mac, follow these steps:

  • Select the Apple logo on the screen and click ‘system preferences’
  • Click on ‘Network icon and then press on the gear icon
  • Then tap ‘Set service order,’ and drag the services you are using at the start of the file
  • For example, if you are utilizing Wi-Fi, select ‘Wi-Fi’ and put it on the first number

self assigned ip example

  • Change DNS servers

DNS servers change the domain name to IP addresses. Try changing the DNS servers to see if the issue fixes. Follow these steps:

  • Select the Apple logo and click ‘system preferences,’ then click on the ‘Network’ icon
  • Select the Wi-Fi icon or Ethernet you use (if not selected already)
  • Then choose the ‘DNS’ tab in the ‘Advanced’ section and press ‘+.’
  • Add the following numbers to the DNS server list: ‘8.8.8.8, 8.8.4.4, 1.1.1.1, 9.9.9.9’ and click ‘OK’
  • It will most likely fix the self-assigned IP address problem in your Mac

self assigned ip example

Contact an Apple support team tech. If the above methods do not fix your Mac’s self-assigned IP address issue.

What does self-assigned IP mean on Mac?

Self-assigned IP is one of the reasons why you are unable to use the internet on your device. It mainly occurs when your network router does not provide your device’s IP address, causing internet connection issues.

How do I give my Mac a static IP address?

You can give your Mac a static IP by following the steps below:

  • Select the Apple logo and click ‘System preferences’
  • Click on the ‘Network’ tab and then select the ‘Advanced button’ 
  • ON TCP/IP section, open the configure IPv4 list and select ‘manually’
  • Enter your IP settings in the field, and the static IP address will the assigned 

Conclusion 

By now, you must have learned how to fix self-assigned IP on your computer. Though it is not a huge problem, it does cause a lot of frustration among users. Hopefully, you found the article helpful and learned how to fix network malfunctions on your mac OS.

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Marid is a lifelong tech enthusiast and is the lead editor of Macdentro.com. An expert on all things Apple and a lifelong Mac user. Marid has over 10 years of experience using Apple products including the Apple watch, Ipad and etc

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iMac connected via Ethernet occasionally getting self-Assigned IP

So I have searched far and wide and have not found a solution. I have tried most of what people have posted here (some over 5 years old) to no avail.

The problem: I use my computer connected via Ethernet all the time and it works fine. Then I will lose internet and I will go to the Network preference and renew the DHCP lease on Ethernet and then it will appear as a Self-Assigned IP with a yellow dot. My wifi never stops working and I can continue to use the internet using wifi. Eventually Ethernet will come back on its own (back to a green dot). I have only managed to get it to come back sooner by rebooting my cable modem. Note that I use an Ethernet cable that has been embedded in my wall to the closet which has my cable modem, router, and switch with other Ethernet cables to the other rooms of the apartment. Here is a list of what I have tried:

  • Using a different patch cable from my switch to the female Ethernet cable leading to the room with the iMac.
  • Unplugging the Ethernet cable from the back of the iMac, from the patch panel, from the switch, from the router.
  • Turning the switch on and off.
  • Rebooting my router
  • Power cycling the router
  • Deleting network preferences in /Library/Preferences/SystemConfiguration
  • Deleting the firewall settings
  • Deleting the Ethernet option and recreating it
  • Rebooting the iMac

I did not try using a different Ethernet cable from the switch to the iMac because ultimately I have no problem getting fast connectivity via that cable, its not like I cannot get Ethernet to work, the issue is it going out and then coming back and having to restart the cable modem (and at times the mac too) to get back on ethernet. I am on an iMac 19,1 running OS X Catalina (10.15.7) with plenty of RAM.

So frustrating that physical connection has these issues. Any idea what could cause this?

Cheefachi's user avatar

Any idea what could cause this?

Fundamentally, it is an intermittent problem with the communications over ethernet between your computer and your router.

In most domestic home networks your router provides the DHCP service by which your computer is assigned an IP-address. If your computer cannot get an answer to it's DHCP request at startup, or after an ipconfig renew, the computer will use a self-assigned IP-address and will then normally not be able to route packets correctly to other networks.

So either your router is unreliable and occasionally unresponsive or you have a cabling problem.

It seems you lose Internet access suddenly at times other than system startup, in my experience this is usually a problem with your ISP connection and router. Some router/ISP combinations have fewer outages or recover more quickly. However it could also be caused by bad cabling, especially any that are accessible or subject to heat cycling, movement, etc.

In your case I would at least try replacing the ethernet cables one by one. Since they are cheap. Before doing so I would look at the Ethernet interface statistics and make a careful note of the numbers of low-level errors that it is seeing over a period of a few hours. You can then do a before and after comparison.

RedGrittyBrick's user avatar

  • I did a lot more experimentation the night I posted this (man, what a pain). The only time it worked even with restarts of everything was when I connected the Mac to the cable modem. I will try replacing the cables I can access (the one to the room is in the wall). I too am wondering whether there is a DHCP conflict between the ISP and my Netgear router. Both the cable modem and the router act as DHCP servers and I am wondering if that causes a conflict. Going to try to set static IPs. How would you see those ethernet interface stats, is there a Mac console log that would show them? –  Cheefachi Oct 12, 2020 at 22:29
  • @Cheefachi: I don't have a Mac but I think the command is netstat -ib or I think you can get the same info using the Network Utility app , located in the /System/Library/CoreServices/Applications folder. It should show the number of TX-errors and RX-errors since the computer was rebooted. You should see many millions of packets sent/received and zero errors. –  RedGrittyBrick Oct 12, 2020 at 22:47
  • So now after a month my setup that bypasses the switch is working. Essentially it is cable modem -> wifi router -> ethernet -> mac circumventing the switch. This is actually very surprising to me as I discovered my cable modem has a DHCP server (that I cannot turn off) but the switch from what I can tell does not and I was sure it was a DHCP IP address conflict. It may still be the issue but with 0 problems since I moved to that I'll stick with this setup until I have the time to debug it some more and everyone else in the household uses Wifi so its not urgent. Thanks for the help everyone! –  Cheefachi Nov 11, 2020 at 16:59

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self assigned ip example

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[SOLVED]   Ethernet has a self assigned IP address/DHCP ?

  • Thread starter charliespies
  • Start date Sep 18, 2021

charliespies

charliespies

  • Sep 18, 2021

House has been wired with Cat5e, was meant to use Cat6. Now NBN is connected we are trying to sought out issue with house network, I am trying to connect my iMac El Captain desktop via ethernet cable. I can connect through wifi. (Also trying to connect Sony Smart Tv.) I have connected my iMac to NBN and modem directly with ethernet cable, upstairs in comms room. When I take desktop downstairs and try and connect via ethernet cables I can not get a connection. I have tried renew DHCP lease for ethernet connection and I have the error " Ethernet has a self assigned IP address and will not be able to connect to the internet" In the ares that I am trying to connect there is a RJ12 coming out of the wall with the the other end being RJ45 going into a switch. The ethernet cable is coming out of the switch and into my computer. Lights are "on" on the switch for the cable going into my computer and rj45. NBN - Modem - ethernet cable into wall to downstairs - rj12 - rj45 - switch - ethernet cable - imac Spent most of the days trouble shooting with service provider. Cablers said we needed a second modem where we have placed the switch, and that they would return a swap the rj12 jack over to ethernet jack. Went to purchase modem and was told by sales that we need a switch instead. So I take it the DHCP is not making it through the ethernet cable? Any manual work around? Is it a problem that cables are cat5e not 6?  

rj12 is telephone lines not data. Cables that have rj12-rj45 are mostly used for a DSL modem connection not to connect to ethernet. Your best bet is to pull the rj12 jacks and replace them with rj45. Getting the proper wire pairs and colors on the correct pins is key to making ethernet work. Telephone doesn' t care as much. If the cable is really cat5e it will work fine cat6 provides no benifit. When you get the correct jacks you should see a light on your switch when it is plugged into the modem. Note if the device you call a modem is really just a modem and not a modem/router you can only plug 1 device into it so a switch will not be of much use.

rj12 is telephone lines not data. Cables that have rj12-rj45 are mostly used for a DSL modem connection not to connect to ethernet. Your best bet is to pull the rj12 jacks and replace them with rj45. Getting the proper wire pairs and colors on the correct pins is key to making ethernet work. Telephone doesn' t care as much. If the cable is really cat5e it will work fine cat6 provides no benifit. When you get the correct jacks you should see a light on your switch when it is plugged into the modem. Note if the device you call a modem is really just a modem and not a modem/router you can only plug 1 device into it so a switch will not be of much use.  

  • Sep 20, 2021

Thank you for your response. Yes old tech had installed a plate with 5 ethernet/1 telephone. The modem upstairs is router/modem. It has 4 ethernet ports. One ethernet comes downstairs into the back of the rj12, and one goes direct into another room downstairs. New techs did say to plug rj12/rj45 from plate into a second modem, so that make sense. New tech where also meant to come back and swap the plate rj12 for a rj45. Is there anything else we can do? Can we change the rj12 on the plate? As still waiting to hear back from tech?  

  • Sep 21, 2021

As long as the wire really is ethernet cable it is very easy to swap the wires. You just remove the wires from the rj12 likely trim off a small amounts and punch them into the rj45 keystone matching the wires to color pattern on the side. Many home improvement stores sell rj45 keystones and many of these do not need special tools to install.  

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Mac-Forums | Fix Mac iPhone iPad | Buying Tips | iOS OS Help

  • Digital Lifestyle
  • Internet, Networking, and Wireless

Self-Assigned IP Address - The Mystery Deepens

  • Thread starter Ratsima
  • Start date Sep 20, 2019
  • Tags address checked iphone keychain password
  • Sep 20, 2019

I didn't intend to continue with this topic, but today I went back to the problematic Class Cafe for the first time in several weeks and got a big surprise. As expected, I got a self-assigned IP address on both my iPad and iPhone. I didn't bother to use my work-around of entering an IP address, etc., manually. About half way through reading the Bangkok Post I got an email message on my iPad. What the heck? I checked, and sure enough, it now had a DHCP assigned IP address. I did nothing, so it just sort of happened. But, no joy with the iPhone. Still had a self-assigned IP. A half hour later and just before I left I checked the iPhone again. It too had a DHCP assigned IP. After I got home I checked the keychain entry for for the SSID classkorat. Now usually the keychain will show you the plain text password for whatever SSID you select. For example, it shows "2186amma" as the password for Cafe Ama's wifi. But, the password for classkorat is now shown as: "A16581C4562743A664144279A5939C3C51DC2A36BE6B7A07A05B5F598C0F3CC7" The actual password, which I had to enter today is: "044007277". I don't know if what's shown is an encrypted version of the actual password or something else. I've never seen this in the keychain. I checked a bunch of other SSIDs and they all show the password in plain text. I remain baffled.  

MacInWin

  • Oct 24, 2019

I came here because of your comment about it in the thread about memory. Could it be that the router is/was just slow in assigning an IP, the iPhone/iPad timed out and went self-assigned, but then tried again later and was successful? Do you have "auto-join" for networks turned on? (I think that is the No option on the "Ask to Join Networks" selection.) I am wondering if the router gets "busy" and doesn't assign IPs fast enough, then gets less busy and gets back to the iDevice fast enough. Not much you can do about that that I am aware of, but could be the issue. I can't explain the password change.  

I was there again day before yesterday (Wednesday here). I decided not to use my "fix" of entering the network data manually. I again just let it sit there with the self-assigned address. It never connected. When I was getting ready to leave, I turned auto-join OFF and tried to join manually. Same result. At that time there were only a few people using the connection. Three of us customers, three employees and two IP TVs. So, letting it sit there worked once, but not twice. I have since learned both from my daughter, who works there some days, and from their IT department, that I am the only customer complaining about the WiFi in that shop. As my daughter said: " Only you ". Two quote Shimon Peres: “If a problem has no solution, it may not be a problem, but a fact - not to be solved, but to be coped with over time.”  

Well-known member

Ratsima said: I have since learned both from my daughter, who works there some days, and from their IT department, that I am the only customer complaining about the WiFi in that shop . Click to expand...

Rod

I fear this may be just another example of the mysteries of the Asia Pacific region which apply as much to things technical as the do to the esoteric.  

  • Oct 25, 2019
Basically with DHCP a device will request re-assignment of a previous IP address from the same source. As all the shops appear to be the same source IE SSID, but are using different net blocks it can cause an argument. Click to expand...

Raz0rEdge

A device will ask to renew an IP address that it's already been given and when that fails, it will take a new address given by the router. However, if non initial IP address could be had and it was using the self-assigned IP address, it will always have to request a new IP address. SSID and IP address subnets are not related and devices remember previous SSIDs (and associated passwords) they've connected to, but not the previous IP addresses they've had. On the OTHER hand, routers will keep a list of MAC addresses and IPs assigned to those addresses and if a request comes from a known MAC address and the IP address which was previously given has been given out, the router will hand back the same IP. So on home networks, the minimal number of devices will tend to get the same IP addresses even over DHCP (even if the lease time is short).  

On the one hand you say: "A device will ask to renew an IP address that it's already been given", but then you say "devices remember previous SSIDs (and associated passwords) they've connected to, but not the previous IP addresses they've had". How does a device ask for an IP address that it has already been given if it doesn't remember the previous IP address they've had?  

IP numbers come with a "lease" which normally has a time associated with it. After that time limit, the device asks for a renewal of that lease from the router. If, for any reason, the lease has already expired before the device asks for the new lease, that number may have been assigned to another user and the router has to issue a new one in the range it controls. I think that is what Ashwin was talking about. Another way it can happen is the device gets out of range of the router before the lease expires, loses contact, then comes back in range and asks for the lease to be renewed. Again, if it's available, no problem, but if not, a new IP is issued. So that is how it works. In your case, Ratsima, if you walk into the shop with that SSID set to "fixed IP" as you said you have done, then when the router communicates, the iPhone does NOT ask for an IP and as long as nobody else has that fixed IP, it should work. But if there is another user on that number, both will get an error about duplication. If you then switch to the DHCP mode, the iPhone will ask the router for a suitable number, and it should issue one in the range it controls, if there is one not currently leased. As for the blocks in different locations, that should not matter. The iPhone doesn't know what the range is that the router controls, and really doesn't care. All it does is request an address and when it has one, uses it. And the fact that store 1 uses range X but store 2 uses range Y doesn't matter to the iPhone at all. All it "knows" is that it asked for an IP and got one. (or not)  

OK. I understand. With all that expertise out there this should be simple: How do I fix it so that both my iPhone and iPad get an IP address at this one recalcitrant store?  

Next time you are in the store, try this. Settings, Wi-Fi, Tap on the SSID and then Forget This Network. Then let it find the SSID again and select the network. It should default to DHCP but you can check that with Settings, Wi-FI, Tap the SSID again and look for "Configure IP" to be Automatic, and below that a valid IP from the router, plus the subnet mask the routers is using and the router IP number itself. It may take some time if the router is cheap and cranky. There are tools for the Mac that can show you all the available routers your Mac can hear, but I couldn't find the same thing for iOS.  

Ratsima said: OK. I understand. With all that expertise out there this should be simple: How do I fix it so that both my iPhone and iPad get an IP address at this one recalcitrant store? Click to expand...
  • [*lForget This Network - Dozens of times
  • Manual Network Configuration - Dozens of times
  • Reset Network Settings - Half a dozen times
  • Factory Reset iPhone - Once

class.jpg

That screenshot looks correct. I just suggested you forget the network because you have, in the past, turned off Automatic and manually assigned an IP, which is playing Russian roulette, network-style. And I think you had the Subnet Mask different from the one displayed in the image, but that post was pretty far back and I may not be remembering correctly. In any event, my thought was to forget the network and start over as if you just showed up for the first time, letting the iDevices and the Router negotiate the connection just like everybody else does. If you have tried that and it doesn't work, then you may well have to just live with it. The cafe is not willing to change, you can't force that, and your iDevices seem to work at other cafes. About all I can think of is to go somewhere else for coffee that works for you.  

I have leaned to live with it. I either use my phone's cellular data or enter a manual configuration. I’m very happy to just sit there and drink my coffee while I read the Bangkok Post. But, I have an insatiable curiosity about this. I want to know what’s going on. If I give up I will have leaned nothing.  

ferrarr

  • Oct 26, 2019

I bet, most (if not all) of their customers don't frequent other locations.  

ferrarr said: I bet, most (if not all) of their customers don't frequent other locations. Click to expand...
Can you please explain how visiting more than one location would affect my devices' ability to get an IP address via DHCP? Click to expand...

So, what is it, then?  

That particular coffee shop doesn't want you to visit. That's about all I can think of. They purposely block you, and only you. I would take it personally, if I were you. ;D  

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self assigned ip example

IP address over ethernet is self-assigned when using a gigabit adapter

I'm using a MacBook Air, M2, running Sonoma 14.1.2.

It connects OK to the internet over Wi-Fi but cannot connect over ethernet when using a gigabit adapter in an outbuilding in the garden.

This is the situation:

The garden is small, and we have an office there, but the wi-fi is unreliable as the office has thick walls; therefore, I need to be able to use the ethernet connection we have from the living room in the house to the office .

  • Macbook can connect on wi-fi everywhere in the house and office (but unreliably in the office).
  • Macbook can connect on ethernet in the living room , straight from the router, using a Belkin USB-C LAN adapter.
  • Macbook cannot connect on ethernet in the office , using same Belkin USB-C LAN adapter. It gets a self-assigned IP address, or a green light, but no data comes through.
  • Husband's iMac can connect on ethernet in the office. His iMac doesn't need an adapter, it has an ethernet port.
  • Husband's iMac cannot connect on ethernet in the office if ethernet cable is coming out of a TP-Link TL-SG1005D, 5 Port Gigabit Ethernet Network Switch.

Troubleshooting (none of this solved the problem, apart from number 4 temporarily)

  • Re-started router, laptop.
  • Contacted my internet provider to check there were no issues with our line.
  • Started Macbook on safe mode.
  • Created new user in Macbook with admin rights and connected succesfully in the office. This happened only once and hasn't happened again.
  • Re-installed previous operating system MacOS Ventura after using repair utility.
  • Upgraded to Sonoma.
  • Renewed DHCP lease.
  • Added DNS servers: 8.8.8.8, 8.8.4.4, 1.1.1.1, 9.9.9.9

Summary: MacBook air would only connect to the internet if straight from the router (with the Belkin adapter, as it does not have an ethernet port). If I need to add another step to this physical connection (through the CAT5e socket at the wall in the office, or the TP-Link switch) it self-assigns an address. This is the case for husband's iMac too, it would only work if there are no extra physical steps in the office, i.e. not through the TP-Link switch.

I have tried everything I can think of, and I have read many threads with no solution.

If anyone can crack this horrible puzzle, I would be SO grateful. Thanks!

MacBook Air, macOS 14.1

Posted on Dec 2, 2023 11:17 AM

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Dec 3, 2023 2:59 AM in response to John Galt

John, thank you very much for taking the time to read my post and answer it. I really appreciate it, as it has been such a frustrating experience to make any sense of the situation with not much knowledge of any of the parts.

I think you're on the right track, and your suspicion is probably correct, based on your explanation of how Gigabit Ethernet is unforgiving of faults.

I did spot two new things after I wrote this post, which may corroborate your suspicion:

The iMac (which is connecting to the ethernet in the office) is doing the following:

  • The speed at which it connects to the internet is so much slower than when connecting a computer to the ethernet straight from the router in the living room.
  • The speed at which the hardware (from System Settings -> Ethernet -> Details -> Hardware -> Configure -> Automatic -> Speed) is 10baseT , which is super slow but, interestingly, automatically chosen as such by the iMac.

I'll let you know what I find once I isolate where the problem is!

John Galt

Dec 2, 2023 2:54 PM in response to srome21

The extensive troubleshooting you performed seems to indicate the problem lies somewhere between the CAT5e socket at the wall in the office and the router. I realize the iMac was able to connect using that same office socket, but only without the Belkin adapter. Introducing the Belkin adapter causes it to fail. You know the adapter itself is ok though, because you can successfully use it when you connect directly to the router in the living room.

If my understanding is correct, the explanation may be that the Belkin adapter is unable to negotiate a connection through that office socket and the router. What that suggests is a Cat5e connection that is not actually meeting the rigorous Cat5e standards. The Belkin adapter itself may be ok but the connection isn't good enough.

The fact the TP-Link switch causes the same failure may be another indication of that substandard office connection. You didn't say whether it was involved in it or not though, or if you tried a different cable.

Lacking some independent testing equipment, the most expedient way of confirming my suspicion is to completely bypass that office socket with a sufficiently long Ethernet cable. Gigabit Ethernet is unforgiving of substandard connectors or wiring. Not enough twists per inch, or a broken / intermittent connection, and things won't work.

Try bypassing that office Ethernet port. I think you will find the culprit will be in the office connections or cables you had been using, and your challenge is to isolate the cause.

Dec 3, 2023 11:43 AM in response to srome21

The following is paraphrased from my notes regarding a discussion I had with an Apple engineer several years ago. The subject of the discussion was the amount of time it took to establish a fast and reliable Ethernet connection. It was taking on the order of 30 seconds or so, and I was wondering why it took so long to establish compared to a comparably fast wireless connection.

"The minimum protocol required to enable an Ethernet connection is 10Base-T.

"When you connect a 1000Base-T (1 GigE) switch, adapter, or other device, the protocol that communicates the Speed / Duplex / Flow Control between the devices is known as Auto-Negotiation. Auto-Negotiation requires only 2 pairs of conductors. The maximum available capability is subsequently shared between the devices.

"If the maximum shared speed for both sides is agreed to be 1 G then the link needs 4 pairs of conductors to sustain that speed. If only 2 conductor pairs are available, both devices will conclude the 4 pair connection is unreliable in way, and will then enter a search mode to find a speed that will work on any available 2 pairs of conductors."

The conclusion we reached was that "search mode" is not as fast as wireless due to that negotiation. If the hardware implemented to test that link is determined to be sufficiently compromised, it will abandon that 4 pair operation and revert to a lower speed which is sustained for the duration of the connection.

From that discussion I learned that the apparently simple Ethernet connection is not so simple after all, and yes it confirms our suspicion that your office-to-router link is not conforming to Gigabit Ethernet requirements. It may not even be conforming to 100Base-T requirements. I suspect you will ultimately find one or more broken or intermittent conductors or connections, and that repairing them will solve the problem. The required number of twists per inch is specified. Exceeding even the maximum length of any particular un-twisted pairs of conductors can affect its negotiated speed.

Since that discussion I learned a lot more about Gigabit Ethernet. The paraphrased notes I created at the time are exceedingly brief.

Dec 3, 2023 11:49 AM in response to John Galt

Thanks again, John. I have decided to get a tradesman to have a look, as I think it is likely to be something I cannot easily fix myself, as I don't have the equipment or the knowledge to test the sockets or the cable from the house to the office. Your responses and all the troubleshooting I've done really point to that. As soon as I find out what is going on, I'll share!

Dec 15, 2023 5:26 AM in response to John Galt

Hi John, I wanted to thank you again and tell you how my problem got solved. I'm writing to you from the office, connected to the ethernet from the computer, which couldn't go online before :)

An electrician came today. He worked out that pair 2 was failing (when he connected his tester). This was a simple fix, as one of the ends of the cable in the office was loose. However, I couldn't still use a switch, and the speeds in the officer were 9mbps. We get 65 Mbps in the house.

I mentioned your thoughts, and he went ahead and tidied up the connection in the office by shortening the bits of cable in the socket. At this point, he realised some of the cables were brittle and cut enough of them off to get rid of them and reconnect them again.

As a result, things got fixed; I'm using a switch and getting the same speed as in the house.

I'm so grateful for your patience in reading all my troubleshooting and recommending the next steps for me. I'm so happy things are fixed now! It took so much time and effort, and when you responded, I was at the end of my tether with this problem, so hearing your thoughts and recommendations was very valuable. Thank you.

Dec 15, 2023 7:41 AM in response to srome21

Great! Glad to hear it.

Thank you for the explanation of the reason. When you find an intermittent connection due to brittle conductors it's very likely all them are in need of attention, so the electrician did it right.

I imagine it didn't cost very much.

Dec 3, 2023 12:01 PM in response to srome21

A reasonably qualified electrician should be able to diagnose the problem in no time. Don't go crazy searching for a network engineer or something.

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  1. Why was 169.254.x.x chosen as self-assigned IP?

    IPv4 link-local addresses weren't added until 2005. The block chosen, 169.254../16, was obtained simply by requesting a block from IANA and having one allocated through the normal allocation process. So it was essentially random, rather than engineered. Added: The 169.254../16 address block used to belong to the US Department of State and ...

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  3. Self assigned IP address

    Read through several of the replies, and noted with interest that the IP address "169.xxx.xxx.xxx" was self-assigned. I ended up re-starting the modem and the Ethernet connection came up correctly, but then the Wi-Fi address was the self-assigned "169.xxx.xxx.xxx". Hmm. Re-started the Wi-Fi part of the modem/router and it was fixed. Really weird.

  4. List of assigned /8 IPv4 address blocks

    Each / 8 block contains 256 3 = 2 24 = 16,777,216 addresses, which covers the whole range of the last three delimited segments of an IP address. This means that 256 /8 address blocks fit into the entire IPv4 space. As IPv4 address exhaustion has advanced to its final stages, some organizations, such as Stanford University, formerly using 36.0.0 ...

  5. Self-Assigned IP Addresses?

    4 - you could manually assign the machines to ip / subnet / gateway, then flush dns / or flush dns then assignt he information - A: I have not flushed the dns so I will try this. 5 whilst on autopmatic, ipconfig /release and before doing renew manually assign it (windows machines, dont know about macs) A: I will try this.

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    If more than one interface is assigned to the VLAN, the BIG-IP system takes additional steps to determine the correct interface, such as checking the Layer2 forwarding table. Second, a self IP address can serve as the default route for each destination server in the corresponding VLAN. ... An example of a non-floating self IP address is the ...

  7. Self-assigned IP addresses

    An IP address within three ranges of numbers that are set aside for the computers in local networks. Assigned to the devices in the network by the DHCP service in the router, these private addresses are not visible on the Internet. The network address translation (NAT) function in the router converts the private addresses to the public address ...

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    3 Answers. A self assigned IP address suggests that your system did not receive an IP address from a DHCP or similar protocol. As Otto Andy Heiskanen mentions, restarting the DHCP server (by rebooting the router) can solve this issue often. However you mention your Linux environment does get an IP address, which could point at a different cause.

  9. Common Elements for Self IP tasks

    A system prompt is displayed on the primary slot of the named guest. Type the command. tmsh create net self address. ip_address/netmask. vlan. vlan_name. allow-service default. . This creates the specified IP address on the guest and makes required adjustments to the port lockdown settings.

  10. How To Fix Internet Not Working Due To Self-Assigned IP ...

    Click on the Library folder and go to Preferences. 3. Now click on the SystemConfiguration folder. 4. Next put the following files in trash. 5. Restart your Mac. Once the reboot has taken place the Internet will start working and self assigned IP address issue will be resolved.

  11. Self IP Addresses

    A self IP address is an IP address on the BIG-IP ® system that you associate with a VLAN, to access hosts in that VLAN. By virtue of its netmask, a self IP address represents an address space, that is, a range of IP addresses spanning the hosts in the VLAN, rather than a single host address.You can associate self IP addresses not only with VLANs, but also with VLAN groups.

  12. How to Fix the Self Assigned IP Address Issue on Mac

    One way to fix self-assigned IP is to set up new network locations on your Mac. Follow the steps below to make a new network location: Tap on the Apple logo from the menu bar and select 'System preferences'. Enter the 'Network settings' then tap on 'Drop-down menu' near the Location tab. Then tap on 'Edit locations' and tap on ...

  13. How do I get rid of a self assigned IP ad…

    Fill in everything as needed. System Preferences>Network>choose interface>Advanced>Proxies Tab, make sure none are set, like for HTTP & HTTPS. System Preferences>Network, unlock the lock if need be, highlight the Interface you use to connect to Internet, click on the advanced button, click on the DNS tab, click on the little plus icon, then add ...

  14. iMac connected via Ethernet occasionally getting self-Assigned IP

    Here is a list of what I have tried: Using a different patch cable from my switch to the female Ethernet cable leading to the room with the iMac. Unplugging the Ethernet cable from the back of the iMac, from the patch panel, from the switch, from the router. Turning the switch on and off. Rebooting my router. Power cycling the router.

  15. [SOLVED] Ethernet has a self assigned IP address/DHCP

    Solution. #2. rj12 is telephone lines not data. Cables that have rj12-rj45 are mostly used for a DSL modem connection not to connect to ethernet. Your best bet is to pull the rj12 jacks and replace them with rj45. Getting the proper wire pairs and colors on the correct pins is key to making ethernet work. Telephone doesn' t care as much.

  16. Ethernet connection fail: self assigned IP

    Ethernet has a self-assigned IP address and will not be able to connect to the Internet I was using the internet just fine and then all of a sudden it stopped working - I can use wireless, but when I go to the network system preferences it is yellow and says self-assigned IP. I have changed the cables from the router and I get a green light saying it is working.

  17. Self-Assigned IP Address

    As expected, I got a self-assigned IP address on both my iPad and iPhone. I didn't bother to use my work-around of entering an IP address, etc., manually. ... Now usually the keychain will show you the plain text password for whatever SSID you select. For example, it shows "2186amma" as the password for Cafe Ama's wifi. But, ...

  18. iphone tethering self-assigned isp caused…

    An example of how to add the iPhone: If you use Private Wi-Fi addresses then you can assign the iPhone a MAC address & a Private IP address. Log in to the router, add your iPhone NAME + iPhone MAC address + private IP address. Your iPhone MAC address is: go to Settings -> General -> About -> the Wi-Fi address (note this address).

  19. IP address over ethernet is self-assigned…

    Macbook can connect on ethernet in the living room, straight from the router, using a Belkin USB-C LAN adapter. Macbook cannot connect on ethernet in the office, using same Belkin USB-C LAN adapter. It gets a self-assigned IP address, or a green light, but no data comes through. Husband's iMac can connect on ethernet in the office.