If you are a Linux system administrator, time will come when you will need to configure networking on your system. Unlike desktop machines where you can use dynamic IP addresses, on a server infrastructure, you will need to setup a static IP address (at least in most cases).
IP address: 192.168.0.100 Netmask: 255.255.255.0 Hostname: node01.tecmint.com Domain name: demodomain.com Gateway: 192.168.0.1 DNS Server 1: 8.8.8.8 DNS Server 2: 4.4.4.4
Configure Static IP Address in RHEL/CentOS/Fedora:
To configure static IP address in RHEL / CentOS / Fedora, you will need to edit:
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/etc/sysconfig/network
/etc/sysconfig/network-scripts/ifcfg-eth0
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Where in the above “ifcfg-eth0″ answers to your network interface eth0. If your interface is named “eth1” then the file that you will need to edit is “ifcfg-eth1”.
Let’s start with the first file:
[php]# vi /etc/sysconfig/network[/php]
Open that file and set:
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NETWORKING=yes
HOSTNAME=node01.demodomain.com
GATEWAY=192.168.0.1
NETWORKING_IPV6=no
IPV6INIT=no
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Next open:
[php]# vi /etc/sysconfig/network-scripts/ifcfg-eth0[/php]
Note: Make sure to open the file corresponding to your network interface. You can find your network interface name with ifconfig -a command.
In that file make the following changes:
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DEVICE=”eth0″
BOOTPROTO=”static”
DNS1=”8.8.8.8″
DNS2=”4.4.4.4″
GATEWAY=”192.168.0.1″
HOSTNAME=”node01.demodomain.com”
HWADDR=”00:19:99:A4:46:AB”
IPADDR=”192.68.0.100″
NETMASK=”255.255.255.0″
NM_CONTROLLED=”yes”
ONBOOT=”yes”
TYPE=”Ethernet”
UUID=”8105c095-799b-4f5a-a445-c6d7c3681f07″
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You will only need to edit the settings for:
DNS1 and DNS2
GATEWAY
HOSTNAME
NETMASK
IPADDR
Other settings should have already been predefined.
Next edit resolve.conf file by opening it with a text editor such as nano or vi:
[php]# vi /etc/resolv.conf[/php]
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nameserver 8.8.8.8 # Replace with your nameserver ip
nameserver 4.4.4.4 # Replace with your nameserver ip
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Once you have made your changes restart the networking with:
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# /etc/init.d/network restart [On SysVinit]
# systemctl restart network [On SystemD]
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Set Static IP Address in Debian / Ubuntu
To setup static IP address in Debian/ Ubuntu, open the following file:
[php]# nano /etc/network/interfaces[/php]
You may see a line looking like this:
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auto eth0
iface eth0 inet dhcp
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Change it so it looks like this:
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auto eth0
iface eth0 inet static
address 192.168.0.100
netmask 255.255.255.0
gateway 192.168.0.1
dns-nameservers 4.4.4.4
dns-nameservers 8.8.8.8
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Save the file and then edit /etc/resolv.conf like this:
[php]# nano /etc/resolv.conf[/php]
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nameserver 8.8.8.8 # Replace with your nameserver ip
nameserver 4.4.4.4 # Replace with your nameserver ip
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Restart the networking on your system with:
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# /etc/init.d/network restart [On SysVinit]
# systemctl restart network [On SystemD]
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Your static IP address has been configured.
You now know how to configure a static IP address on a Linux distro. If you have any questions or comments, please do not hesitate to submit them in the comment section below.
