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How to configure a static IP address in CentOS 7

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You may have set up a CentOS server and, in the process, accidentally set it up with DHCP. If your CentOS server uses a GUI, changing that IP address from dynamic to static is very simple. But what if your server is a text-only machine? What do you do then? Fortunately, it’s not all that hard to configure that GUI-less server with a static IP address–you just have to know where it’s configured and know the syntax of the configuration. Of course, by nature of what we’re working on this is all done manually, so be prepared to type.

I’ll be working on CentOS 7 . I’ll assume you already have the operating system installed and working properly, have access to the machine, and have an administrative account. With that out of the way, let’s set up that static IP address.

Find your interface

The first thing we must do is find out the name of our ethernet interface. A static IP address cannot be configured without this name. To do this, log into your server and issue the command ip a . The output of this command ( Figure A ) will include the name of the interface.

manually configure ip address centos 7

As you can see, from my output, the name of my interface is enp0s3. Now that we know the name of our interface, we can configure the static address.

Configuring the address

Within the directory /etc/sysconfig/network-scripts/ you should find the file ifcfg-INTERFACENAME (Where INTERFACENAME is the name of your interface). In my instance, the file is ifcfg-enp0s3. It is important that you configure that file, and not the ifcfg-eth file. Open the correct file for editing with the command sudo nano /etc/sysconfig/network-scripts/ifcfg-enp0s3 . We need to modify that file in order to not only change the protocol from dhcp to static, but to add the specific IP address. So when you open up that file, you’ll want to change:

BOOTPROTO=dhcp

BOOTPROTO=static

Now you’ll need to add the entries to set not only the IP address, but the netmask, gateway, and DNS addresses. At the bottom of that file, add the following:

IPADDR=192.168.1.200 NETMASK=255.255.255.0 GATEWAY=192.168.1.1 DNS1=1.0.0.1 DNS2=1.1.1.1 DNS3=8.8.4.4

NOTE: All fields in bold, you will edit to reflect your networking needs. If you have fewer or more DNS entries, add or remove them as needed.

Save and close that file. In order to make the changes take effect, issue the command sudo systemctl restart network. Once the networking system has restarted, issue the command ip a to see that your IP address has changed to reflect your configuration.

And that’s all there is to setting a static IP address on CentOS. That wasn’t so hard, now was it? Don’t think this technique is limited only to GUI-less CentOS servers. You can use the same method to set a static IP address on a CentOS server with a GUI as well.

Enjoy having more control over your CentOS network interfaces.

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Tecmint: Linux Howtos, Tutorials & Guides

How to Configure Network Static IP Address on RHEL/CentOS 8/7

The scope of this tutorial is to explain how we can edit and make changes to Network Configurations on RHEL/CentOS 8/7 from the command line only, and, more specifically how we can set up a Static IP address on network interfaces using system network-scripts, which is a must be configured to serve Internet-facing network services, and how to configure or change RHEL/CentOS system hostname .

Configure Network Interface in CentOS 7

Also will show you, how we can manage or disable unwanted system services, such as Network Manager , which is no longer needed in-case you use a manual static IP configured on network scripts, Avahi-Daemon which is, also, not needed on a server and represents a seriously security gap, unless you installed the server on your Laptop and you want to instantly browse your network for other services, and on the final will present you Network Manager Text User Interface – nmtui , a system utility that can ease the job of editing your system network settings with advanced Interface configurations like creating Bond , Bridge , Team and VLAN Interfaces.

Requirements

  • Installation of “CentOS 8.0″ with Screenshots
  • Installation of RHEL 8 with Screenshots
  • How to Enable RHEL Subscription in RHEL 8
  • CentOS 7.0 Minimal System Installation
  • RHEL 7.0 Minimal System Installation
  • Active RHEL 7.0 Subscriptions and Functional Repositories

Also, be aware that most of the configurations offered by editing system files should not be performed from a remote location using SSH service until you establish a continued and reliable network connection using a fixed IP address.

On this page

  • Disable Unwanted Services in CentOS
  • Set Static IP Address on CentOS
  • Set Hostname in CentOS
  • Set Static IP Address on CentOS Using Nmtui Tool

Step 1: Disable Unwanted System Services in CentOS

1. Before actually starting to do anything we need to make sure that our system has some necessary editing and networking tools like netstat , ifconfig , wget , curl , and lsof installed, some of them will not be used on this step but it’s better to have them installed for future configurations.

Install Networking Tools in CentOS

2. After the tools have installed run ifconfig to get your Network Interfaces settings and status, and, then run netstat or lsof command to check what services are running by default on our server.

Check Network Interfaces and Services Status

3. The netstat command output is pretty self-explanatory and shows a list of sockets associated with their running program name.

If, for example, our system will not be used as a mail service you can stop Postfix master daemon which runs on localhost and, also stop and disable other unwanted services using the following commands – the only service I advise not to stop or disable for now is SSH if you need remote control over the server.

Stop Postfix Service

Stop Postfix Service

Stop Avahi Daemon Service

Stop Avahi Daemon

4. You can, also, use old init commands to stop or disable services but since Red Hat now implements systemd process and service management, you should better get used to systemctl commands and use it often.

If you use Arch Linux then it should be a piece of cake to switch to systemd – although all init commands now are linked and pass-through systemd filter.

5. If you want to get a list of all started services run the service command and for an exhaustive report use systemctl .

List All Services in Linux

6. To manage services run the systemctl command using the most important switches: start , stop , restart , reload , disable , enable , show , list-dependencies , is-enabled, etc. followed by your service name.

Also, another important feature that the systemctl command can also run on a remote server through SSH service on a specified host using -H option and perform the same actions as locally.

For example, see the command and screenshot below.

Run systemctl on Remote Server

Step 2: Configuring Static IP Address on CentOS

7. Before start editing Network Interface Card system files make sure that from now on and until you set static IP, you have physical or any other type of access to your server, because this step requires bringing down your network interface and connections.

Although it can be done smoothly without disrupting your connectivity and activate connection after reboot . There is no way you can test it before reboot if you only have a single NIC attached. Still, I will present to you with the entire method and indicate the steps needed to be avoided in case you want to maintain your connectivity and test it afterward.

8. Now move to /etc/sysconfig/network-scripts/ path, open and choose your Network Interface you want to assign static IP for editing – to get all NICs names to use ifconfig or IP command as shown.

Check Network Interface Name

9. Next, use the following network template to edit the file and make sure that the ONBOOT statement is set on YES , BOOTPROTO is set to static or none and don’t change HWADDR and UUID values provided by default.

Make the following changes as shown.

Configure IP Address in CentOS 8

10. After finishing editing the file, close it, and move to resolv.conf file if you want DNS servers enabled system-wide.

Here just add your DNS servers using nameserver statement.

11. Now Network Interface is configured with a static IP, the only thing remaining is to restart your network or reboot your system and use ifconfig or IP command to view the IP address and test configuration using ping command.

NOTE : After restart use the newly static IP address configured to perform remote login with SSH.

Check New IP Address

Step 3: Setting Hostname in CentOS

12. To adjust system hostname system-wide, open hostname and hosts file located on /etc path and edit both the following way.

Hostname File

Here you can add just the name of the system but it’s a good idea to append the .dot domain to.

Here add the same hostname as above on the 127.0.0.1 line before the localhost.localdomain statements.

Set Hostname in CentOS 7

Alternatively, you can set hostname using the hostnamectl command as shown.

13. To test if your hostname is correctly set use hostname command.

Step 4: Set Static IP Address on CentOS Using Nmtui Tool

14. NetworkManager Text User Interface (TUI) tool, nmtui , is an RHEL intuitive tool which provides a text interface to configure networking by controlling Network Manager, which helps to edit advanced network settings such as assign static IP addresses to Network Interfaces, activate or disable a connection, edit WI-FI connections, set your system hostname or create advanced Network interfaces like InfiniBand, bond, bridge, team or VLAN.

NetworkManager-tui is installed by default in RHEL/CentOS 7.0, but if for some reason its missing issue the following command to install it.

14. To start Network Manager Text User Interface run the nmtui command and use TAB or arrow keys to navigate through and press Enter to select an option. If you want to directly edit or connect a specific interface run the following options.

Configure Static IP in CentOS

If you want to set static IP you can, also, use Network Manager Text User Interface as a facile alternative to actually edit network interfaces files, with a limited number of options that method has to offer, but make sure Network Manager service is enabled and started on your system.

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11 thoughts on “How to Configure Network Static IP Address on RHEL/CentOS 8/7”

After 2 hours tests, Good all be fine, it works fine, just Added : In smb.conf file configuration in [Anonymous]

1- be sure that your server has a static connection 2- added user with password : smbpasswd -a username

Thank For Author I have make a samba configuration in 2 hours

I feel learning with quick manner in this site Thank you very much

I also routinely disable NetworkManager on my servers, but do note that “nmtui” (and also nmcli) are NetworkManager clients, so you cannot use them if you have disabled NetworkManager.

Excellent!. This is the ONLY post on setting static IP on Centos which is correct. Simple flow.

All: Just follow the steps as is.

Great explanation. Great job guys.

Great article. The static IP configuration works great on my RHEL 7 server vm.

Just have a question. The Red Hat documentation says that BOOTPROTO should be set to “none”. My copy of your configuration only works with BOOTPROTO=static as you used in your example. If I set it to none the ip address does not get updated. I am having some discussions with our Linux sys admins since they are insisting that I should follow only the Red Had docs and this is a problem as I can’t make it work with BOOTPROTO=none. Is there a reason why it only works with BOOTPROTO=static?

If it works with bootptoto=static then stick with this option as long as it does the job right! As far as i know it should work also with none (none actually specifies that no boot-time protocol should be used but the IP value from IPADDR=1.2.3.4 variable should be updated for NIC at boot time).

@Ehwan Kho: Just use ip link show or ifconfig -a command and you should see all your NICs names. You can also use nmtui to edit your new card settings.

How do I add a new network card – NIC? I tried using lspci | grep Ethernet, it display that it 2 cards. My question now how could I know its name? as they are not using the eth1, eth2 et al.. And I can’t see /etc/udev/rules.d/70-persistent-net.rules. Your thoughts are highly appreciated.

In my opinion you can use both approaches, manual editing NICs interfaces or configure static IP using NM or nmtui if you dont have a GUI. But for a better control and flexibility over your NICs you should go with manual configurations, without NM. If you go with manual without NM don’t forget to use NM_CONTROLLED=no and ONBOOT=yes parameters.

please matie cezar can you teach me how to network a small firm. i will be happy if you can teach me form scratch to the level of networking a firm. i want to learn the installation and configuration

I ALWAYS disable network manager on Servers, it’s too dynamic and wastes resources. Why Red Hat is pushing that crap I don’t know, but I haven’t met anyone who wants it on a server. It’s great for desktops, and laptops, but NOT servers. Also, the DNS settings need to stick to being setup in the resolv.conf file, not spread out in the ifcfg scripts. Keeps the config manageable and easy to troubleshoot.

From going over the documentation on RHEL/CentOS 7, it appears that they’re really pushing for NetworkManager to be the default way to manage networking. For servers (not desktop) do you believe it’s best to disable NetworkManager and just assign static IPs normally as you have instructed or do you believing managing all the network through net manager is worth it?

The reason I ask is because I only deal with servers (not desktops) and I’ve seen many times NetworkManger causing major network issues. So I’m still on the fence whether or not to do things through netManager. Specially considering that rhel 7 is using it by default.

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manually configure ip address centos 7

How to configure a static IP address on CentOS 7

Last updated on November 7, 2020 by Dan Nanni

If you want to set up a static IP address on a network interface in CentOS 7, there are several different ways to do it, varying depending on whether or not you want to use Network Manager for that.

Network Manager is a dynamic network control and configuration system that attempts to keep network devices and connections up and active when they are available). CentOS/RHEL 7 comes with Network Manager service installed and enabled by default.

To verify the status of Network Manager service:

To check which network interface is managed by Network Manager, run:

manually configure ip address centos 7

If the output of nmcli shows connected for a particular interface (e.g., enp0s3 in this example), it means that the interface is managed by Network Manager. You can easily disable Network Manager for a particular interface, so that you can configure it on your own for a static IP address.

Here are two different ways to assign a static IP address to a network interface on CentOS 7 . We will be configuring a network interface named enp0s3 .

Configure a Static IP Address without Network Manager

Go to the /etc/sysconfig/network-scripts directory, and locate the configuration file of the interface ( ifcfg-enp0s3 ). Create it if not found.

manually configure ip address centos 7

Open the configuration file and edit the following variables:

manually configure ip address centos 7

In the above, NM_CONTROLLED=no indicates that this interface will be set up using this configuration file, instead of being managed by Network Manager service. ONBOOT=yes tells the system to bring up the interface during boot.

Save changes and restart the network service using the following command:

Now verify that the interface has been properly configured:

manually configure ip address centos 7

Configure a Static IP Address with Network Manager

If you want to use Network Manager to manage the interface, you can use nmtui (Network Manager Text User Interface) which provides a way to configure Network Manager in a terminal environment.

Before using nmtui , first set NM_CONTROLLED=yes in /etc/sysconfig/network-scripts/ifcfg-enp0s3 .

Now let's install nmtui as follows.

Then go ahead and edit the Network Manager configuration of enp0s3 interface:

The following screen will allow us to manually enter the same information that is contained in /etc/sysconfig/network-scripts/ifcfg-enp0s3 .

Use the arrow keys to navigate this screen, press Enter to select from a list of values (or fill in the desired values), and finally click OK at the bottom right:

manually configure ip address centos 7

Finally, restart the network service.

and you're ready to go.

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manually configure ip address centos 7

How to Configure CentOS 7 Network Settings

CentOS 7 network settings banner

The following tutorial will guide you through configuring CentOS 7 network settings. If you are familiar with CentOS 6 or lower, you will notice that the network configuration files are largely the same.

The biggest difference between the latest major version and those below it is the naming convention for network interfaces. Prior to CentOS 7 the network interfaces were numbered, starting from 0. The first interface would also be named eth0. This is no longer the case, as the first network interface is now labeled enp3s0. To add some confusion, the next interface is labeled enp8s0.

Understanding Network Interface Naming

A predictable way of determining a network interfaces name was introduced in CentOS 6. However, it wasn’t until CentOS 7 was released that the feature was enabled by default.

The predictable naming convention assigns a name to an interface based on a number of factors. For an ethernet card, the following are used: type, bus, and slot. For example, the first network interface for a CentOS 7 server running on Virtualbox would be labeled enp3sp, or Ethernet device, bus 3, slot 0.

Disabling Predictable Naming

While it is not recommended to disable this feature, you may disable it at any time. By doing so you return to having a naming convention of etc[0,1,2,3…].

Common Settings

GATEWAY : The IP address of your network gateway. Required if you require connectivity beyond your local network subnet, such as having Internet connectivity.

IPADDR : The IP address of the network interface.

Configuration File

Configuring a static ip.

A static address is one that is permanently assigned to one host. It is an address that is manually configured by the administrator.

  • Open the configuration file for your network interface. vi /etc/sysconfig/network-scripts/ifcfg-eth0
  • Add the following settings to the file: DEVICE=enp3s0 ONBOOT=yes IPADDR=192.168.1.10 NETMASK=255.255.255.0 GATEWAY=192.168.1.1
  • Save your changes and exit
  • Your new settings will not apply until the network interface is restarted or brought online. If you are remotely logged into the server and modifying the network settings of the interface you are connected to, reboot the system.
  • Restarting the network interface. ifdown enp0s3 ifup enp0s3

Configuring DHCP Settings

A dynamic address is one leased from a DHCP server when a system boots or a network interface comes online. The following settings configure a network interface for DHCP.

  • Open the configuration file for your network interface. vi /etc/sysconfig/network-scripts/ifcfg-
  • Add the following settings. If a configuration already exists, modify it to look like the following: DEVICE=enp3s0 ONBOOT=yes DHCP=yes

Validate Your Network Settings

You will want to ensure that your network interface has applied your new settings. You can use the IP command to output its settings.

The output will display basic information about the interface, such as device name, IP address, MAC address, etc. The following is an example of the output.

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LinuxToday

How to configure a static IP address on CentOS 7 / RHEL 7

On CentOS 7 or RHEL 7 one need to use the NetworkManager daemon. It attempts to make networking configuration and operation as painless and automatic as possible by managing the primary network connection and other network interfaces, like Ethernet, WiFi, and Mobile Broadband devices. In this quick tutorial you will learn about configuring a network interface using ifcfg files located in /etc/sysconfig/network-scripts/ directory in a CentOS 7 and RHEL 7.

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configure ip address centos

Configure IP address in Linux (RHEL/CentOS 7)

The first thing that we do after installing an operating system is to configure the IP address i.e. networking on the machine. Whether we want to connect to the internet or only to our local area network (LAN), we must provide information regarding our network to the machine. In this tutorial, we are going to discuss how to configure IP address in Linux (RHEL/CentOS 7) using three different methods.

Also if you would like to assign an IP address to your Ubuntu system, then please refer to this tutorial How to manage network in Ubuntu 18.04 – Netplan Command  or you can also refer to the tutorial for IP COMMAND, using which you can manage the network on all Linux distributions that have IP command installed.

(Recommended Read: IP Aliasing: Assigning multiple IP addresses to single NIC )

Configure IP address in Linux

Method 1- by editing the network interface file.

This method works on all Linux distributions. To configure the IP address, we need to open the network configuration file & pass our network information in the file. In RHEL/CentOS 7, location for all network interfaces in ' /etc/sysconfig/network-scripts ', in our case name of network interface is 'ifcfg-en0s3'. We will now edit the file to configure a static IP address for our system. Open the network interface file,

$ cd /etc/sysconfig/network-scripts $ vi ifcfg-en0s3

configure ip address linux

To configure a static IP address, change the ' BOOTPROTO ' to ' none ' (it's DHCP by default) & enter IP address, gateway & DNS information.  Also, change ' ONBOOT ' to ' yes ' so that we don't have to start networking services every time we restart our system.

configure ip address linux

After making all the changes, save the file & then restart the networking services to implement the changes.

$ systemctl restart network $ vi ifcfg-en0s3

Method 2 - Using the Graphical interface

If we are using RHEL/CentOS with GUI then we can easily configure IP address graphically.  Open 'Network' either by clicking the network icon & then selecting ' Network Settings ' on the top-left corner of the screen or goto Applications-> System Tools-> Settings-> Network.

configure ip address linux

Next, click on the Settings icon (on the bottom right corner of the opened window) & select IPV4 then mention your network information on the opened window.

configure ip address linux

After the IP information has been edited, click on apply & exit from the menu. Lastly restart network services for implementing the changes.

Method 3- Using NMTUI command

This method can be used in GUI as well as in CLI. For using it in GUI mode, open a terminal and enter the command 'nmtui' & press enter or if using CLI, just enter the command 'nmtui' & press enter. This will open a new window with 3 options i.e. we can edit our network interface, activate a network interface, or set a hostname for our system  (read our tutorial on setting hostname HERE ).

To set up networking for the system, select 'Edit a connection', select your network interface & then select 'Edit' using the arrow keys. In the 'IPv4 Configuration' select 'manual' & then enter your network information.

configure ip address centos

After making changes, press 'OK' to save the file & on the next screen press 'Quit' to exit from the menu. Restart your network services for changes to take effect.

Apart from these three methods, you can also configure IP address when installing operating system & also there are two more methods through which we can configure our network on RHEL/CentOS 7 machines i.e. by using ' nmcli command & ifconfig command . This wraps up our tutorial on how to configure IP address in Linux. For any queries/questions, please use the comment box below.

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UbuntuMint – Everything About Ubuntu Linux

How to Set a Static IP Address in CentOS Linux

An IP ( Internet Protocol ) Address is a unique numerical representation of a computer on a network. Every computer connected to the Internet is identified by an IP Address.

Usually, IP addresses are dynamically assigned to a computer by a dedicated server called DHCP Server ( Dynamic Host Control Protocol ), and hence change from time to time as and when the connection is lost and reestablished.

However, there are scenarios where a static IP address is more preferable; Eg. In large corporations, where it removes the load of using DHCP for each computer in the organization.

Today, we will learn how to set a static IP address on a local network in CentOS .

List Network Interface Name

A computer can be connected to one or more network interfaces, for example to a WiFi device and a LAN device, which has different IP addresses for each interface.

Run the following command to show the interface names.

List Network Interface Names

The interface ‘ enp0s3 ‘ is the LAN device connected to my computer and the IP Address is ‘ 10.0.2.15 ‘. The other interface ‘ lo ‘ ( Loopback ) which is nothing but the local network of the computer within itself. Thus my computer is only connected to one interface, ‘ enp0s3 ‘.

Configuring Static IP Address in CentOS

Go to directory ‘ /etc/sysconfig/network-scripts ‘ and list the files; you should see a file corresponding to your network interface.

List Network Interface Files

Open the file ‘ifcfg-enp0s3’ using ‘ Vim ‘ or any editor of your choice.

Set the following values for the variables. Change the values according to the IP address and subnet that you need to set.

Set IP Address in CentOS

Save and exit the file. Restart the networking service with the following commands:

Finally, run ‘ ifconfig ‘ again to verify if static IP has been set.

Verify IP Address in CentOS

In this article, we saw an easy way to set an IP address in CentOS. The example, in this case, is a static IP on the local network, i.e., it is not a static public IP over the Internet.

To set a static public IP address over the Internet, you need to purchase the IP Address and configure it in the file as shown above, along with other details like DNS server, network prefix, which will be provided by your Internet Service Provider.

Thanks a lot for reading and let us know your thoughts in the comments below!

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lintut.com - Linux Howto's Guide

How to configure static ip address on CentOS 7

In this small tutorial i will explain how to configure static ip address on CentOS 7  minimal. First, need to edit the set up for the ethernet. Let’s start with editing “ /etc/sysconfig/network-scripts/ifcfg-enp0s3″  file:

And add following line:

Configure DNS Server

add following line:

Now restart your network or rebooting system

Check your network:

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11 comments.

I think you did not mention the subnet mask in the ifcfg file.

Yes, where can I configure the netmask?

Thank you so much! I was going through so many articles on how to do this and your did the trick. Excellent!!

Hi, I have set the network configuration , All correct , But when i run ifconfig -a i get wrong Gateway IP address. How can i fix or where can i chagne or correct these settings. From the interface and /etc/sysconfig/network-scripts/ifcfg-em1 all seesm to br correctly set.

Try this $ nmtui edit your_interface

Thanks nmtui helped me to change the hostname, But i still face issue with Default Gateway. i cannot ping to ouside network.

yes great job !! now tell me how to revert it. 🙂

facing issues though followed the step accordingly, unable to ping my gateway even. does the order of the sequence is to be followed strictly as mentioned ??

after you edit /etc/resolv.conf in step “Configure DNS Server”, disable network manager since you no longer need it. If enabled it will overwrite your resolve.conf file and thats why you can’t ping out. as root: # systemctl stop NetworkManager # systemctl disable NetworkManager at this point you can proceed to the next step restarting network :

“Now restart your network or rebooting system” /etc/init.d/network restart

The formating above is bad. # systemctl stop NetworkManager

# systemctl disable NetworkManager

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Assigning a static address using ip commands, configuring multiple addresses using ip commands, quick links.

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Configuring a Static IP in CentOS 7 for Enhanced Network Stability

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A reliable network connection is essential for smooth communication and data transmission in today’s networked environment. Making use of CentOS 7’s static IP address configuration is one technique to guarantee constant network access. You may improve network stability by following the thorough directions in this step-by-step tutorial, which will take you through the whole procedure.

Accessing the Terminal in Step 1

Step 2: authenticating as root, identifying the network interface in step 3, editing network configuration files in step 4, modifying the network configuration in step 5, step 6: finishing and saving, step 7: start up the network service again, verifying network configuration in step 8.

Launch CentOS 7’s Terminal to get started. You may accomplish this by choosing “Terminal” from the “System Tools” section of the “Applications” menu after clicking on it.

Enhance stability. Buy Linux VPS . Configuring Static IP in CentOS 7. Get yours now!

You’ll need root access to set up a static IP. To log in as root, type the following command into the Terminal:

The network interface name connected to your CentOS 7 machine must then be identified. To get a list of accessible network interfaces, use the command below:

Find the interface name for your network connection, such as eth0, eth1, or ens33.

Configuring Static IP in CentOS 7

Open the network configuration file for the specified network interface in your chosen text editor (such as nano or vi). For instance, if your interface is called “eth0,” run the command:

Find the line containing “BOOTPROTO” in the network configuration file, then change “dhcp” to “static” on that line. To select your preferred IP address, subnet mask, gateway, and DNS servers, add the lines below:

Exit the text editor after saving your modifications to the network configuration file.

Restart the network service by running the following command to apply the modified network configuration:

Use the following command to determine if the static IP setup was properly implemented:

The modified IP address linked to your network interface should now be visible.

Conclusion: By carefully following this detailed how-to, you have successfully set up a static IP in CentOS 7. This guarantees a steady network connection, enabling reliable communication and data transmission. Benefit from improved network stability and continuous connection.

Keep in mind that setting up a static IP is a useful skill for both system administrators and network hobbyists.

Why should I configure a static IP in CentOS 7?

Configuring a static IP in CentOS 7 ensures a consistent network connection by assigning a fixed IP address to your system. This eliminates the reliance on DHCP servers and prevents potential IP conflicts, resulting in enhanced network stability.

Can I use any IP address for the static configuration?

While you have flexibility in choosing an IP address, it is important to ensure that the IP falls within your network's subnet range. Consult your network administrator or refer to your network documentation to determine the appropriate IP address to use for your static configuration.

What if I make a mistake while modifying the network configuration file?

If you encounter issues or make a mistake while editing the network configuration file, you can revert to the previous configuration by restoring the file from a backup. Alternatively, you can correct the errors by re-editing the file and saving the changes.

Do I need to restart my CentOS 7 system after applying the static IP configuration?

In most cases, restarting the system is not necessary after configuring a static IP. However, you will need to restart the network service by executing the command "systemctl restart network" for the changes to take effect.

Can I configure multiple static IP addresses on CentOS 7?

Yes, CentOS 7 allows you to configure multiple static IP addresses on different network interfaces. Simply repeat the steps outlined in the guide for each network interface, ensuring that the IP addresses, subnet masks, gateways, and DNS servers are set correctly for each interface.

Remember, if you encounter any difficulties or have specific network requirements, it is always recommended to consult with a network administrator or refer to CentOS 7 documentation for further assistance.

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How To Configure IP Address in CentOS 7 / RHEL 7 & CentOS 6 / RHEL 6

manually configure ip address centos 7

Just after the installation of operating systems, you must configure the network to access your system from outside. This guide helps you to Configure IP Address in CentOS 7 / RHEL 7 & CentOS 6 / RHEL 6 .

Here I will show how to configure Static IP addresses for your machine and also configure the network interface to get an IP address from the DHCP server.

Prerequisites

Let’s check the available interfaces on our system. Use the ifconfig command to list interfaces.

From the above output, you can see my system has two interfaces namely lo and ifcfg-enp0s3 . Depends on hardware, the name of the interface will change.

To set an IP address to an interface, go to /etc/sysconfig/network-scripts/ directory, there you will find a file ifcfg-<interfacename> .

As per the above output, my system has a file ifcfg-enp0s3 since CentOS 7 / RHEL 7 uses consistent network interface naming.

Static IP Address

In this mode, we will manually assign an IP address to machines.

Edit the ifcfg-<interfacename> file.

Restart the network service using the below command.

Now you can see the ip address 192.168.0.10 assigned to the interface enp0s3 .

DHCP IP Address

In this mode, the system will get an IP address from the DHCP server. This is the default mode set on CentOS to get an IP address from the DHCP server.

Just modify the lines like this.

Now you can see the ip address 192.168.0.23 assigned to the interface enp0s3 using DHCP.

That’s All. Please share your feedback in the comments section.

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Posted on Mar 27, 2023

How to configure a static IP address on CentOS 7 with VirtualBox

This article aims to explain how to configure a static IP address on a CentOS 7 virtual machine using VirtualBox.

We will go step by step, and at the end of this blog, you will be able to ssh into your virtual machine using a never-changing IP.

What is a static IP?

Every computer has a random local IP address unless you have specified the contrary. These addresses are not fixed. It means that they could change.

In most cases, you don’t care about the IP address, but you usually do with virtual machines.

If you have a MySQL service running on a virtual machine, you would want to save the connection configuration once and re-use it every time. If the IP address changes, you have to modify the connection settings.

Another approach is to use port-forwarding. This approach is okay until you have 3 or more virtual machines with multiple services and ports to keep track of.

The following image shows the ideal local development environment with static IP addresses.

Image description

Configure VirtualBox Networking

The app VirtualBox has some networking settings we have to set before changing the VM Linux configuration.

We want our VM to have the following:

  • Access to the internet
  • Access to our host computer

And we also want to be able to access the VM by IP.

Step 1: Stop the VM

You have to stop the VM before doing the following steps.

Step 2: Create Ethernet Adapter

Click on Tools - Networks and make sure you have an ethernet adapter created. Write down the IPv4 Prefix, because the static IP will be in this range.

Image description

In the image above:

  • The gateway is 192.168.56.1
  • The network mask is 255.255.255.0 (24 bits)

The static IP of my VM will be in the 192.168.56.xx range.

Step 3: Change adapters

Right-click on the virtual machine and choose the “Network” tab. We are going to add 2 adapters:

  • The first one is going to be a NAT. This way the VM will have internet access.
  • The second one has to be a “Host-only Adapter” with the ethernet adapter of the previous step. This is the adapter that will have the static IP assigned.

Image description

Configure VM Centos 7

Now that we have configured the VirtualBox networking, we will configure the inner VM networking settings.

Step 1: Start the VM

Double-click on the VM or right-click and start.

Step 2: Get the connection name

We know the static IP will be assigned to the second adapter, the Host-only Adapter.

Let’s check the vm networking using ip addr | head -n 20 :

Image description

  • enp0s3: NAT Adapter
  • enp0s8: Host-Only Adapter

Now we know we have to assign an IP to the enp0s8 device. To get its connection name, you have to execute the following statement:

nmcli -p device

Image description

The connection name is “Ethernet connection 1”.

Step 3: Configure connection IP

There are two ways of doing it:

  • Graphically with nmtui
  • With bash statements and nmcli

In our case, we will execute some statements in the console.

If we execute ip addr | head -n 20 again, we will see the previous IP address.

Image description

Step 4: Reboot

The last step is to reboot the VM

Test the connection

Now we can connect to the VM using the command ssh [email protected]

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How to configure ipv6 address in Linux (RHEL / CentOS 7/8)

This step by step by guide to configure IPv6 address is validated on RHEL and CentOS 7 .

How-to-configure-ipv6-address-linux

IPv6 can act as a replacement for the IPv4 network protocol. The major problem it solves is the exhaustion of IPv4 addresses by using a much larger network address space. It also provides a number of enhancements and new features for network configuration management and support for future protocol changes.

The key reason IPv6 is not yet in wide deployment is that the core protocol does not have a simple way for systems that only have IPv6 addresses to communicate with systems that only have IPv4 addresses.

An IPv6 address is a 128-bit number , normally expressed as eight colon-separated groups of four hexadecimal nibbles (half-bytes). Each nibble represents four bits of the IPv6 address, so each group represents 16 bits of the IPv6 address.

To make it easier to write IPv6 addresses, leading zeros in a colon-separated group do not need to be written. However at least one nibble must be written in each field. Zeros which follow a non zero nibble in the group do not need to be written.

Since addresses with long strings of zeros are common, combine one or more groups of consecutive zeros with exactly one :: block.

Notice that under these rules 2001:1:1:1443::400 would be another less convenient way to write the example address. But it is a valid representation of the same address, and this can confuse administrators new to IPv6.

Some tips for writing consistently readable addresses

  • Always suppress all the leading zeros in a group
  • Use :: to shorten as much as possible. If two runs of zeros are equal in length, shorten the leftmost run of zeros by preference.
  • Although it is allowed, do not use :: to shorten one group of zeros, Use :0: instead, and save :: for runs of zeros longer than a single group.
  • Always use lowercase letters for hexadecimal numbers a through f .

Pre-requisite before starting to configure IPv6 address

Make sure that IPv6 is enable on your node. Look out for below entry in your sysctl configuration

This will list the IPv6 status for the default value and per interface value.

Here " 0 " means IPv6 is in active on our node, if the above returns " 1 " then it means IPv6 is disable on your node. So if the IPv6 is disable then your IPv6 configuration will not work.

I have already written an article with steps to enable or disable IPv6

Comparison of nm-setting and ifcfg-* directives

The following table maps some of the key NetworkManager settings name relevant to IPv6 connections to ifcfg-* directives.

Configure IPv6 address using Network Manager.

Open Network Manager Console from your Linux node

Select Edit a Connection and click on Ok

How to configure ipv6 address in Linux (RHEL / CentOS 7/8)

Next look out for your Ethernet card on which you wish to configure IPv6 address. If your NIC card does not appear on the list then you can add a new device . Since for me my device ( eno50 ) exists, so I will select the device and select Edit

How to configure ipv6 address in Linux (RHEL / CentOS 7/8)

This will bring you the main configuration page where you must give all the details to configure IPv6 address. Since I do not want to add IPv4 address to the same Ethernet device, I have disabled the IPv4 option.

Provide the IPv6 address/subnet and the gateway . Make sure you select Automatically Connect

How to configure ipv6 address in Linux (RHEL / CentOS 7/8)

Lastly click OK to exit the utility.

Next restart the network services to activate the changes

Now let us check the network configuration of eno50

So looks like I was able to successfully configure my interface with IPv6 address.

Validate the connectivity by pinging the IPv6 gateway

So I am able to connect to my gateway which means my IPv6 configuration was successful.

Configure IPv6 address using CLI

The following command will add a new connection for the interface eno49 , which will auto connect at startup, getting IPv4 networking information using DHCPv4. It will also get IPv6 networking settings by listening for router advertisements on the locallink.

The below command configures the eno49 interface statically using the IPv6 address and network prefix 2001:1:1:1443::433/122 and default IPv6 gateway 2001:1:1:1443::43F , but it still auto connects at startup and saves its configuration into /etc/sysconfig/network-scripts/ifcfg-eno49 .

Let us validate our configuration by pinging the gateway using eno49 interface

Again with the CLI looks like the steps are successful for me.

Modify existing IPv6 configuration

In the below command we are changing the IPv6 address of our interface eno49 from 2001:1:1:1443::433 to 2001:1:1:1443::434 , while the gateway remains the same.

Restart the eno49 interface

Next bring the the interface

Validate the new IP address for eno49 device

Check the connectivity from eno49 to it's gateway

Check the configuration file for eno49

I hope the steps from the article to configure IPv6 address on Linux (CentOS/RHEL 7/8) was helpful. Let me know your suggestions and feedback using the comment section.

Deepak Prasad

He is the founder of GoLinuxCloud and brings over a decade of expertise in Linux, Python, Go, Laravel, DevOps, Kubernetes, Git, Shell scripting, OpenShift, AWS, Networking, and Security. With extensive experience, he excels in various domains, from development to DevOps, Networking, and Security, ensuring robust and efficient solutions for diverse projects. You can reach out to him on his LinkedIn profile or join on Facebook page.

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Thank You for your support!!

6 thoughts on “How to configure ipv6 address in Linux (RHEL / CentOS 7/8)”

How did you get /122 when creating the new ip address and same gateway example?

This is the gateway and subnet provided by our network team.

For us noobs: the network should be restarted after the address setup:

service network restart

Thanks for your feedback, I have updated the article 🙂

I really love your website.. Very nice colors & theme. Did you make this amazing site yourself? Please reply back as I’m planning to create my very own site and want to know where you got this from or exactly what the theme is called. Kudos!

One update for Centos 8. Change systemctl restart network to systemctl restart NetworkManager.service

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Modifying ESXi Host IPs in CentOS 7 DNS

Manually Modifying IP Addresses of ESXi Host in CentOS 7 DNS Records

Abstract: Learn the steps to manually modify IP addresses of ESXi hosts in CentOS 7 DNS records.

Manually Modifying IP Addresses on an ESXi Host and CentOS 7 DNS Server Records

In this article, we will discuss the complete steps required to manually modify IP addresses on an ESXi host and CentOS 7 DNS server records. This DNS virtual machine is running on the host. We have tried modifying the forward record, but it was unsuccessful.

Prerequisites

  • Access to the ESXi host and the CentOS 7 DNS server
  • Basic knowledge of networking and DNS concepts
  • A text editor, such as vim or nano, installed on the CentOS 7 DNS server

Modifying the IP Address on the ESXi Host

To modify the IP address on the ESXi host, follow these steps:

  • Connect to the ESXi host using the vSphere Client.
  • Select the ESXi host in the inventory and click on the "Configure" tab.
  • Under "System", click on "Networking".
  • Select the "vSwitch" that is connected to the network where you want to modify the IP address.
  • Click on the "Ports" tab and select the virtual NIC that is connected to the network.
  • Click on "Edit" and modify the IP address, subnet mask, and default gateway as required.
  • Click "OK" to save the changes.

Modifying the Forward Record on the CentOS 7 DNS Server

To modify the forward record on the CentOS 7 DNS server, follow these steps:

  • Log in to the CentOS 7 DNS server using SSH or a terminal.
  • Open the DNS configuration file using a text editor. For example, to use vim, enter the following command:
  • Find the "forward" section and modify the IP address as required. For example:
  • Save and close the file.
  • Restart the DNS service for the changes to take effect. For example, to restart the named service, enter the following command:

Modifying the Reverse Record on the CentOS 7 DNS Server

To modify the reverse record on the CentOS 7 DNS server, follow these steps:

  • Find the "zone" section for the reverse lookup zone and modify the IP address as required. For example:
  • Edit the reverse lookup zone file using a text editor. For example, to use vim, enter the following command:
  • Modify the PTR record for the IP address as required. For example:
  • Modifying the IP address on the ESXi host involves connecting to the host using the vSphere Client, selecting the network, and modifying the IP address, subnet mask, and default gateway as required.
  • Modifying the forward record on the CentOS 7 DNS server involves editing the DNS configuration file, modifying the forwarders section, and restarting the DNS service.
  • Modifying the reverse record on the CentOS 7 DNS server involves editing the DNS configuration file, modifying the reverse lookup zone, editing the reverse lookup zone file, and restarting the DNS service.
  • VMware vSphere Client User Guide
  • CentOS 7 DNS Server Configuration Guide
  • RFC 1035 - Domain Names - Implementation and Specification

Modifying the IP addresses of ESXi hosts in CentOS 7 DNS records can be done manually. Here's a step-by-step guide to help you through the process.

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Tags: :  ESXi CentOS DNS IP address

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IMAGES

  1. How to configure a static IP address on CentOS 7 / RHEL 7

    manually configure ip address centos 7

  2. Change IP Address on Centos 7 via Command line

    manually configure ip address centos 7

  3. How To Configure Static IP Address in CentOS 7 / RHEL 7

    manually configure ip address centos 7

  4. Configure centos 7 static ip

    manually configure ip address centos 7

  5. How to configure a static IP address on CentOS 7

    manually configure ip address centos 7

  6. How to configure a static IP address on CentOS 7 / RHEL 7

    manually configure ip address centos 7

VIDEO

  1. Configure network Static IP Address on Centos 7 Using Terminal

  2. CentOS 7 Tutorial

  3. Configure a static IP address in CentOS7

  4. How to Configure a Static IP Address on Network Interface Centos 7 Linux

  5. Configure static IP address on CentOS 7

  6. Change IP Address on Centos 7 via Command line

COMMENTS

  1. How to configure a static IP address on CentOS 7 / RHEL 7

    Verification. Verify new IP settings using the ip command for the NIC named eth0: # ip a s eth0. Verify new routing settings: # ip r. Next, verify DNS servers settings using the cat command or grep command to query the /etc/resolv.conf file as follows: # cat /etc/resolv.conf. Finally verify the internet connectivity using the ping command:

  2. How to configure a static IP address in CentOS 7

    So when you open up that file, you'll want to change: BOOTPROTO=dhcp. To: BOOTPROTO=static. Now you'll need to add the entries to set not only the IP address, but the netmask, gateway, and DNS ...

  3. How to Configure CentOS Network Settings {via terminal or GUI)

    1. Open the Network Manager by running the following command in the command line: nmtui. 2. The command prompts the NetworkManager TUI window, which appears as in the image below. Select Edit a connection to view configuration settings. 3. Next, choose the network you want to configure.

  4. Manual Network Configuration in Linux and How to Set a Static IP Address

    a specific IP address; full control over the address assignment; Since the Dynamic Host Configuration Protocol (DHCP) can take the Media Access Control (MAC) address into account when assigning the network-layer address, we might still automatically receive the same IP on each connection with that protocol. Moreover, the client can usually specify a preference.

  5. How to Configure Network Static IP Address on RHEL/CentOS 8/7

    Configure IP Address in CentOS 8. 10. After finishing editing the file, close it, and move to resolv.conf file if you want DNS servers enabled system-wide. # nano /etc/resolv.conf. Here just add your DNS servers using nameserver statement. nameserver 192.168.1.1. nameserver 8.8.8.8. 11.

  6. How to configure a static IP address on CentOS 7

    If you want to set up a static IP address on a network interface in CentOS 7, there are several different ways to do it, varying depending on whether or not you want to use Network Manager for that.. Network Manager is a dynamic network control and configuration system that attempts to keep network devices and connections up and active when they are available).

  7. Configure Static IP Address on CentOS 8|CentOS 7

    There is an existing guide on how to configure static IP address using ip and ifconfig commands available on: Using ip and ifconfig to configure Linux networking. Wrapping Up. We have covered complete steps of How to configure static IP address on CentOS using manual modifications of network configuration files and using nmcli command line tool.

  8. How To Configure Static IP Address in CentOS 7 / RHEL 7

    READ: How To configure DHCP server on CentOS 7, Ubuntu 18.04 & Debian 9. But, if you go to the bigger organizations, they use static (manual) IP to avoid network issues due non-availability of DHCP servers. Configure Static IP Address in CentOS 7 / RHEL 7. Let us configure our system for the following information.

  9. How to Configure CentOS 7 Network Settings

    Prior to CentOS 7 the network interfaces were numbered, starting from 0. ... Configuring a Static IP. A static address is one that is permanently assigned to one host. It is an address that is manually configured by the administrator. Open the configuration file for your network interface.

  10. How to configure a static IP address on CentOS 7 / RHEL 7

    How to configure a static IP address on CentOS 7 / RHEL 7. On CentOS 7 or RHEL 7 one need to use the NetworkManager daemon. It attempts to make networking configuration and operation as painless and automatic as possible by managing the primary network connection and other network interfaces, like Ethernet, WiFi, and Mobile Broadband devices ...

  11. Configure IP address in Linux (RHEL/CentOS 7)

    Method 2 - Using the Graphical interface. If we are using RHEL/CentOS with GUI then we can easily configure IP address graphically. Open 'Network' either by clicking the network icon & then selecting 'Network Settings' on the top-left corner of the screen or goto Applications-> System Tools-> Settings-> Network.. Next, click on the Settings icon (on the bottom right corner of the opened window ...

  12. How to Set a Static IP Address in CentOS Linux

    Set IP Address in CentOS. Save and exit the file. Restart the networking service with the following commands: # nmcli networking off # nmcli networking on Finally, run 'ifconfig' again to verify if static IP has been set. # ifconfig Verify IP Address in CentOS Conclusion. In this article, we saw an easy way to set an IP address in CentOS.

  13. How to configure static ip address on CentOS 7

    In this small tutorial i will explain how to configure static ip address on CentOS 7 minimal. First, need to edit the set up for the ethernet.

  14. 3.6. Configuring IP Networking with ip Commands Red Hat Enterprise

    The package name in Red Hat Enterprise Linux 7 is iproute. If necessary, you can check that the ip utility is installed by checking its version number as follows: ~]$ ip -V. ip utility, iproute2-ss130716. The ip commands can be used to add and remove addresses and routes to interfaces in parallel with NetworkManager, which will preserve them ...

  15. nmcli commands for static IP networking in CentOS 7

    Instead, I would like a series of specific nmcli commands that can be entered into the terminal manually, and which also can make it easier to design a bash script later. Here is the current manual process, which works: 1.) The device eno1 was created during an automated installation process. 2.) Assign the IP address with the given netmask to ...

  16. Static IP Configuration on CentOS 7

    # ip a s eth0. New routing # ip r. DNS servers # cat /etc/resolv.conf. Internet connectivity # ping -c 3 cyberciti.biz # ping -c 4 google.com. Second Method The second method for configuring eth0 interface is the use of Network Manager nmtui command is used: # nmtui edit eth0 Conclusion. Congratulations, you now know how to do Static IP ...

  17. Configuring a Static IP in CentOS 7 for Enhanced Network Stability

    Use the following command to determine if the static IP setup was properly implemented: ip addr show. The modified IP address linked to your network interface should now be visible. Conclusion: By carefully following this detailed how-to, you have successfully set up a static IP in CentOS 7.

  18. Easy guide to assign Static IP Address on CentOS / RHEL (7 & 8)

    In this tutorial, we will learn how to assign static IP addresses in CentOS 7 or 8 machines. There are two ways we can assign a static IP address in CentOS 8 systems, 1- Using Network manager. 2 ...

  19. How To Configure IP Address in CentOS 7 / RHEL 7 & CentOS 6 ...

    In this mode, the system will get an IP address from the DHCP server. This is the default mode set on CentOS to get an IP address from the DHCP server. Edit the ifcfg-<interfacename> file. Just modify the lines like this. Restart the network service using the below command.

  20. Quick Guide To Modify CentOS 7 Network Config Files

    Configuring Network Interface for DHCP. step # 1: Find the Network Interface Name. step # 2: Edit the Network Configuration File. step # 3: Edit the Configuration File. step # 4: Restart the Network Service. step # 5: Verify the Changes. CentOS 7 Network Config Through the GUI. Configure a Static IP Address.

  21. How to configure a static IP address on CentOS 7 with VirtualBox

    Step 3: Change adapters. Right-click on the virtual machine and choose the "Network" tab. We are going to add 2 adapters: The first one is going to be a NAT. This way the VM will have internet access. The second one has to be a "Host-only Adapter" with the ethernet adapter of the previous step. This is the adapter that will have the ...

  22. How to configure ipv6 address in Linux (RHEL / CentOS 7/8)

    Select Edit a Connection and click on Ok. Next look out for your Ethernet card on which you wish to configure IPv6 address. If your NIC card does not appear on the list then you can add a new device. Since for me my device ( eno50) exists, so I will select the device and select Edit.

  23. Manually Modifying IP Addresses of ESXi Host in CentOS 7 DNS Records

    Click on "Edit" and modify the IP address, subnet mask, and default gateway as required. Click "OK" to save the changes. Modifying the Forward Record on the CentOS 7 DNS Server. To modify the forward record on the CentOS 7 DNS server, follow these steps: Log in to the CentOS 7 DNS server using SSH or a terminal.

  24. How to install and configure gitlab-CE on a local CentOS 7?

    I have manually installed GitLab Community Edition (gitlab-ce) on my CentOS 7 server, which has 2 CPUs and 8GB of memory. The installation process went smoothly, and I have kept all configurations at their default settings, except for the external_url option, which I set to my server's IP address.. After running gitlab-ctl reconfigure and restarting GitLab, I waited for over half an hour, but ...