Ubuntu Linux: Creating ethernet alias for eth0 network device

Q. I am using Ubuntu Linux and I would like to know how to create alias for eth0 so that I can have multiple IP address?

A. To create alias for eth0 use ifconfig command. It is use to configure a network interface and aliases.

Assuming that your eth0 IP is 192.168.1.10 and you would like to create an alias eth0:0 with IP 192.168.1.11. Type the following command:

sudo ifconfig eth0:0 192.168.1.11 up

OR

sudo /sbin/ifconfig eth0:0 192.168.1.11 up

Verify that alias is up and running using following two command(s):

/sbin/ifconfig
ping 192.168.1.11
ping your-getway-ip

Permanent configuration

Your ethernet configuration is located in a file called /etc/network/interfaces. If you reboot system you will lost your alias. To make it permanent you need to add it network configuration file:

gksudo gedit /etc/network/interfaces

OR

sudo vi /etc/network/interfaces

Append the following configuration:

auto eth0:0
iface eth0:0 inet static
name Ethernet alias LAN card
address 192.168.1.11
netmask 255.255.255.0
broadcast 192.168.1.255
network 192.168.1.0

Save the file and restart system or restart the network:

sudo /etc/init.d/networking restart

Please note that you can also use graphical tools located at System > Administration > Networking menu. Or use the following GUI tool to setup aliases, hostname, dns settings etc:

sudo network-admin

If you want more network aliases, use eth0:1, eth0:2, eth0:N (max upto 254).

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27 comments… add one
  • Bashed Nov 8, 2016 @ 3:39

    How do I bind an entire /22 in Ubuntu 16 server?

    right now I have this in interfaces:

    auto eno1
    iface eno1 inet static
    address xxx.xxx.16.2
    netmask 255.255.252.0
    network xxx.xxx.16.0
    broadcast xxx.xxx.19.255
    gateway xxx.xxx.16.1
    # dns-* options are implemented by the resolvconf package, if installed
    dns-nameservers 8.8.8.8 8.8.4.4
    dns-search domain.com

    I need to bind the full /22. I can only ping the .2 right now.

  • Swati Jun 22, 2016 @ 6:16

    Thanks, it worked!

  • Innokenty Longway Jul 22, 2014 @ 15:41

    All worked out. Thank you.

  • Yan Adam Jan 13, 2014 @ 16:16

    This thread is a little stale I guess but it’s the closest I could find…

    For those having issues with their aliases not coming up automatically on reboot, I’ve discovered that if the “root” interface ethx with no alias is not brought up, the aliases do not get configured.

    I fixed this by adding this lone entry only to my /etc/network/interfaces :
    auto ethx

    This worked under Ubuntu 12.04 at least.

  • Alexis Wilke Sep 23, 2013 @ 21:20

    Qui,

    It looks like the answer changed when Linux 2.2 came out. So there is no real limit (4 billion, 2 power 64 minus 1) but having too many will slowing down your system and your hardware is not unlikely going to have a limit of its own.

    Source:

    http://superuser.com/questions/231656/what-is-the-maximum-number-of-ips-that-can-be-assigned-to-a-given-computer

  • Qui Sep 23, 2013 @ 12:10

    Hi , i want to know how you sure max alias is 254 ??

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