Change IP Address

Change IP Address

This instruction helps to you change ip address of your server.

Show current ip address

I prefer to use ip address command to do that.

tacgui@tacacsgui:~$ ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: ens32: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:95:71:fd brd ff:ff:ff:ff:ff:ff
    inet 10.6.20.11/24 brd 10.6.20.255 scope global ens32
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe95:71fd/64 scope link
       valid_lft forever preferred_lft forever

Change Network Settings

You can use different editors, but nano is more user-friendly. Use command sudo nano /etc/network/interfaces to edit main network file.

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto ens32 # name of interface
iface ens32 inet static
        address 10.6.20.11 # ip address of your interface
        network 10.6.20.0 # you can change that entry or delete it
        broadcast 10.6.20.255 # you can change that entry or delete it
        gateway 10.6.20.1 # Gateway
        # dns-* options are implemented by the resolvconf package, if installed
        dns-nameservers 8.8.8.8 # DNS server ip address
        dns-search tacacsgui.local # you can change that entry or delete it

If you will use nano editor, to save changes press Ctrl + x and then press y to approve the save action.

Apply New Settings

It is final step. Use bunch of commands sudo ip addr flush dev ens32; sudo ifdown ens32; sudo ifup ens32;. Replace ens32 before applying, if you have other interface name.