Question

13

How do I set an extra IP for an existing interface?

rated 0 times [ 13] [ 0] / answers: 1 / hits: 22940 / 2 Years ago, sun, march 13, 2022, 8:50:40

I have an interface eth0, and I wish to give it an extra virtual IP. I achieve this by the following:

ifconfig eth0:0 ip.address.goes.here netmask subnet.address.goes.here

This works fine, however, when I reboot, this is lost.

I have tried editing /etc/network/interfaces to add the following:

auto eth0:0 iface eth0:0 inet static

    address ip.address.goes.here

    netmask subnet.address.goes.here

However, upon rebooting, the static ip for eth0 is loaded fine, but, the eth0:0 virtual IP is not loaded at all.

So, how can I permanently add the eth0:0 virtual IP?

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rmodmi

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3 Years ago

answered 2 Years ago altybol · Accepted Answer

Instead of that eth0:0 business, you should do this:

Configure your (one) static IP address in /etc/network/interfaces as you normally would:

# The primary network interface

auto eth0

iface eth0 inet static

address 192.168.0.201

network 192.168.0.0

netmask 255.255.255.0

broadcast 192.168.0.255

gateway 192.168.0.1

Add another IP to this interface by adding this right after the above:

up /sbin/ip addr add 192.168.0.203/24 dev eth0

down /sbin/ip addr del 192.168.0.203/24 dev eth0

The complete file should look like this

Now, if you check what IP addresses are configured by running ip addr show, both will show up:

2: eth0:  mtu 1500 qdisc pfifo_fast state UP qlen 1000

    link/ether 08:00:27:1d:fa:0b brd ff:ff:ff:ff:ff:ff

    inet 192.168.0.201/24 brd 192.168.0.255 scope global eth0

    inet 192.168.0.203/24 scope global secondary eth0

My thanks to Lekensteyn for pointing me in the right direction. Every site on the internet just talks about eth0:0 for a secondary IP address. This seems like the proper way to do it.