Adding Virtual nic's to *nix

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Sometimes, we need to add virtual NICs to our *nix machine. To do this, copy the eth0 configuration file from /etc/sysconfig/network-scripts/:

[root@test ~]# cp /etc/sysconfig/network-scripts/ifcfg-eth0 /etc/sysconfig/network-scripts/ifcfg-eth0:1

Edit the ifcfg-eth0:1 file and remove the "HWADDR" line:

[root@test ~]# vim /etc/sysconfig/network-scripts/ifcfg-eth0:1

After editing, the file should look like this:

DEVICE=eth0:1
BOOTPROTO=none
ONBOOT=yes
NETMASK=255.255.255.0
IPADDR=192.168.56.102
GATEWAY=192.168.56.1
TYPE=Ethernet
USERCTL=no
IPV6INIT=no
PEERDNS=yes

You can then use the ifup command to bring the virtual NIC up:

[root@test ~]# ifup eth0:1
In Debian and other Debian-based distributions:

Open the interfaces configuration file:

root@debian:~# vim /etc/network/interfaces

The file will look like this:

auto eth0
iface eth0 inet static
address 192.168.56.101
netmask 255.255.255.0

Add the following lines to include a virtual NIC:

auto eth0:1
iface eth0:1 inet static
address 192.168.56.102
netmask 255.255.255.0

Now, you can use the ifup command to activate the virtual NIC:

root@debian:~# ifup eth0:1

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