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How to configure Static IP Address in Ubuntu / Debian / LinuxMint

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Setting up the network and bringing servers into the network is the initial administration task for any system administrator.

In some cases, these tasks are automated using DHCP (Dynamic Network Configuration Protocol) which takes care of assigning IP Address to Desktop and Servers.

READ: How to configure DHCP server on CentOS 7 / Ubuntu 16.04 / Debian

But, if you go to the bigger infrastructure they use static (manual) IP to avoid network problems due non-availability of DHCP servers.

 

Configure Static IP Address in Ubuntu / Debian

Let us configure our network interface for the following information.

IP Address = 192.168.1.10
Netmask = 255.255.255.0
GATEWAY=192.168.1.1
DNS Server 1 = 192.168.1.1
DNS Server 2 = 8.8.8.8
Domain Name = itzgeek.local

Switch to the root user.

su -

OR

sudo su -

Make sure you install resolvconf package.

apt-get -y install resolvconf

Find the available network interfaces on your system

You can use any one of the below commands to get a list of network interfaces available on your system.

ifconfig

OR

ip a

Choose the desired network interface

The output of the ifconfig command:

enp0s3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.6  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fd50:1d9:9fe3:1400:79fa:c48f:b679:c85  prefixlen 64  scopeid 0x0
        inet6 fd50:1d9:9fe3:1400:a00:27ff:fe36:34ae  prefixlen 64  scopeid 0x0
        inet6 fe80::a00:27ff:fe36:34ae  prefixlen 64  scopeid 0x20
        ether 08:00:27:36:34:ae  txqueuelen 1000  (Ethernet)
        RX packets 226971  bytes 327928478 (312.7 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 60417  bytes 4869126 (4.6 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10
        loop  txqueuelen 1  (Local Loopback)
        RX packets 4714  bytes 6158753 (5.8 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 4714  bytes 6158753 (5.8 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

At this time, my system interface (enp0s3) takes IP Address from DHCP server.

READ: How to configure DHCP server on CentOS / Ubuntu / Debian

For this demo, we will configure a static IP for that interface.

Configure Static IP Address

Edit the interfaces file.

nano /etc/network/interfaces

Update the file with below information. If you are adding DNS entries in /etc/network/interfaces file, then you need to install the resolvconf package

# Interface Name #
auto enp0s3
# Static IP Address #
iface enp0s3 inet static
# IP Address #
address 192.168.1.10
# Netmask #
netmask 255.255.255.0
# Gateway #
gateway 192.168.1.1
# DNS Servers #
dns-nameservers 192.168.1.1
dns-nameservers 8.8.8.8
# Search Domain #
dns-search itzgeek.local

Restart the networking using the following command.

service networking restart

Verify Static IP Address

Verify the static IP using below commands.

ifconfig

OR

ip a

Output:

enp0s3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.10  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fd50:1d9:9fe3:1400:a00:27ff:fe36:34ae  prefixlen 64  scopeid 0x0
        inet6 fe80::a00:27ff:fe36:34ae  prefixlen 64  scopeid 0x20
        ether 08:00:27:36:34:ae  txqueuelen 1000  (Ethernet)
        RX packets 107  bytes 10918 (10.6 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 165  bytes 22379 (21.8 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10
        loop  txqueuelen 1  (Local Loopback)
        RX packets 824  bytes 66440 (64.8 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 824  bytes 66440 (64.8 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Also, verify the DNS servers entries.

cat /etc/resolv.conf

Output:

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 192.168.1.1
nameserver 8.8.8.8
search itzgeek.local

That’s All.

 

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How to configure Static IP Address in Ubuntu / Debian / LinuxMint

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