Comments on: Linux Creating or Adding New Network Alias To a Network Card (NIC)

By: mandeep kharel

mandeep kharel — Tue, 27 Dec 2011 15:27:10 +0000

thanks this help to my configure my network

By: Patrick

Patrick — Tue, 19 Jul 2011 15:54:30 +0000

For my centos5 this information was not sufficient. I’ve added a IP alias eth1:1 on a different subnet than eth1 with this ifcfg-eth1:1 file:
GATEWAY=194.xxx.xxx.xxx
TYPE=Ethernet
DEVICE=eth1:1
BOOTPROTO=none
NETMASK=255.255.255.0
IPADDR=194.xxx.xxx.xxx
USERCTL=no
IPV6INIT=no
ONPARENT=yes
PEERDNS=yes

This works fine with a:
service network restart

By: Pinoy

Pinoy — Wed, 27 Apr 2011 19:19:15 +0000

Thanks I just managed to add a new network alias to my server. :) I also followed Steve’s advice about the onboot parameter.

By: Steve Harper

Steve Harper — Sat, 19 Mar 2011 23:15:53 +0000

The ONBOOT parameter is not appropriate for a Virtual IP / IP Alias – you need to use the ONPARENT param instead.

HTH,
Steve Harper

By: Andrew K

Andrew K — Thu, 17 Mar 2011 06:21:35 +0000

Since when does an alias have to be on the same subnet? I use aliases all the time at work to create private “dev” VLANS with servers I SSH to directly (with a simple switch in between).

By: Stefan Lasiewski

Stefan Lasiewski — Wed, 09 Feb 2011 22:22:20 +0000

I agree with Michael Leahy.

/usr/share/doc/initscripts-*/sysconfig.txt says that the alias interfaces should not duplicate the information contained in the parent device.

From /usr/share/doc/initscripts-*/sysconfig.txt

/etc/sysconfig/network-scripts/ifcfg- and
/etc/sysconfig/network-scripts/ifcfg-::
The first defines an interface, and the second contains
only the parts of the definition that are different in a
“alias” (or alternative) interface. For example, the
network numbers might be different, but everything else
might be the same, so only the network numbers would be
in the alias file, but all the device information would
be in the base ifcfg file.

By: Michael Leahy

Michael Leahy — Mon, 29 Mar 2010 17:50:34 +0000

According to the documentation in /usr/share/doc/initscripts-*/sysconfig.txt, the file defining the eth0:0 device on RedHat/RHEL/CentOS/Fedora systems should only contain the information that is different from the parent eth0 device.

By: vamsi

vamsi — Sun, 31 Jan 2010 19:52:41 +0000

Hi sir
If I have several additional IPs, will creating eth0:1, eth0:2 and so on.
work’s ?
thanks :D

By: Vamsi

Vamsi — Tue, 19 Jan 2010 17:45:38 +0000

thanks !..will try to ad failover ip’s on my ovh box :)

By: Ross Sutherland

Ross Sutherland — Tue, 01 Sep 2009 10:58:27 +0000

Hello, I am very new to Linux. Currently using Ubuntu and was wondering what the following line means.
“name Ethernet alias LAN card”
Any help on this would be great thanks!

By: Manu Ignatius

Manu Ignatius — Tue, 25 Nov 2008 02:02:41 +0000

This blog explains how to create an aliased interface using a C program.
Link
Might be useful for some of you I guess.

By: Walid Rudwan Osman

Walid Rudwan Osman — Mon, 16 Apr 2007 07:08:19 +0000

Hello there
I am using Linux enterprise 4 on my Toshipa Laptop but it didn’t recognizing my NIC so I had to ask for the NIC installation file so I get and this is the name of the file install_8_37[1].tar but I dont know what to do after that ,so i need any help to do this but just please make simple and much details as much as you can because I am not quite expert.