4.1 KiB
Debian Specific Static IP Address Setup
Get the interface name by looking at
ip a
Example - here the interface we are targeting is enp1s0
~$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
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 noprefixroute
valid_lft forever preferred_lft forever
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 52:54:00:0c:f6:e7 brd ff:ff:ff:ff:ff:ff
altname enx5254000cf6e7
inet 192.168.50.80/24 brd 192.168.50.255 scope global dynamic noprefixroute enp1s0
valid_lft 85984sec preferred_lft 75184sec
inet6 2404:4400:4181:9200:5054:ff:fe0c:f6e7/64 scope global dynamic mngtmpaddr proto kernel_ra
valid_lft 86366sec preferred_lft 86366sec
inet6 2404:4400:4181:9200:617f:906e:3877:3f00/64 scope global dynamic mngtmpaddr noprefixroute
valid_lft 86366sec preferred_lft 86366sec
inet6 fe80::b2a2:4462:bece:c8b7/64 scope link
valid_lft forever preferred_lft forever
~$
We will be updated the interfaces file int he networking dir.
Before we do anything we always make a backup copy
sudo cp /etc/network/interfaces /etc/network/interfaces.bak
looking at the interface file its shows that the interface is set to dynamic
** Orginal interface 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
allow-hotplug enp1s0
iface enp1s0 inet dhcp
# This is an autoconfigured IPv6 interface
iface enp1s0 inet6 auto
We will update the face enp1s0 inet dhcp
section to look like this
Example of updated 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
allow-hotplug enp1s0 iface enp1s0 inet static address 192.168.50.20 netmask 255.255.255.0 gateway 192.168.50.254 dns-nameservers 192.168.50.254 8.8.8.8
This is an autoconfigured IPv6 interface
iface enp1s0 inet6 auto
After you have made this edit you can restart the service to get the new IP address
luddie@Node1-master:~$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
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 noprefixroute
valid_lft forever preferred_lft forever
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 52:54:00:0c:f6:e7 brd ff:ff:ff:ff:ff:ff
altname enx5254000cf6e7
inet 192.168.50.20/24 brd 192.168.50.255 scope global enp1s0
valid_lft forever preferred_lft forever
inet 192.168.50.80/24 brd 192.168.50.255 scope global secondary dynamic noprefixroute enp1s0
valid_lft 86372sec preferred_lft 75572sec
inet6 2404:4400:4181:9200:617f:906e:3877:3f00/64 scope global dynamic mngtmpaddr noprefixroute
valid_lft 86369sec preferred_lft 86369sec
inet6 2404:4400:4181:9200:5054:ff:fe0c:f6e7/64 scope global dynamic mngtmpaddr proto kernel_ra
valid_lft 86369sec preferred_lft 86369sec
inet6 fe80::b2a2:4462:bece:c8b7/64 scope link
valid_lft forever preferred_lft forever
luddie@Node1-master:~$
The network is now available via the updated ip address... HOWEVER did you see the old IP is still there?
inet 192.168.50.80/24 brd 192.168.50.255 scope global secondary dynamic noprefixroute enp1s0
valid_lft 86372sec preferred_lft 75572sec
Easiest way of dealing with this...
sudo reboot
And when the machine comes back up, ssh using the newly statically assigned IP address.