Linux command to remove virtual interfaces or network aliases

by on September 21, 2006 · 4 comments· LAST UPDATED March 20, 2008

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Q. How do I remove virtual interfaces such as eth0:1 or eth1:1?

A. Use ifconfig command. It is used to remove virtual interfaces or network aliases.

Ifconfig is used to configure the kernel-resident network interfaces. It is used at boot time to set up interfaces as necessary. After that, it is usually only needed when debugging or when system tuning is needed.

Type the command to remove eth0:1:
# ifconfig eth0:1 down

/etc/sysconfig/network-scripts/ifcfg-ethX-range0 file

To remove interface permanently edit network configuration file stored at /etc/directory. For Red Hat / Fedora Core file stored in /etc/sysconfig/network-scripts/ directory. For Debian or Ubuntu Linux just edit file /etc/network/interfaces and remove the entries. For example open file called /etc/sysconfig/network-scripts/ifcfg-eth1-range0
# vi /etc/sysconfig/network-scripts/ifcfg-eth0-range0
You will see network aliases configuration:
IPADDR_START=192.167.1.5
IPADDR_END=192.167.1.100
CLONENUM_START=0
NETMASK=255.255.255.0

Just comment out everything or just rename the file:
# mv /etc/sysconfig/network-scripts/ifcfg-eth0-range0 /etc/sysconfig/network-scripts/working.ifcfg-eth0-range0.backup
Just restart network service:
# service network restart

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{ 4 comments… read them below or add one }

1 Ravi February 10, 2010 at 12:34 pm

Thanks Vivek, Very informative article, I hope its easy to use virtual interface, can you suggest how do I disable the alias/virtual interfaces at boot time and up this after system boot when I want manully, or through /etc/init.d/network cmd, I have already found this range file option but did not get the range break, like IPADDR_START=10.0.0.241 to
IPADDR_END=10.0.0.249 but not start the IP 10.0.0.242 how its possible

Ravi

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2 Jim June 29, 2011 at 11:17 pm

Little late with this but what the hey. You must be careful using ifconfig ethx:x down. If you run more than one virtual interface on a network card taking one out of the middle will move the list up. Say if you have 4 virtual interfaces of which the first is the real eth1. So if you take out eth1:2 then eth1:3 becomes eth1:2 and eth1:4 becomes eth1:3. This may confuse some scripts that deal with virtual interfaces. Beware.

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3 James Cordell March 2, 2012 at 10:11 am

I find this does not work for me. I am trying to remove a virtual interface

bond0:514 Link encap:Ethernet HWaddr 00:1F:F4:F6:DF:36
inet addr:10.133.133.133 Bcast:10.255.255.255 Mask:255.0.0.0
UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1

# ifconfig bond0:154 down
SIOCSIFFLAGS: Cannot assign requested address

im on.
Linux in-asterix01.gs2.bt.ip-soft.net 2.6.18-92.1.22.el5 #1 SMP Tue Dec 16 11:57:43 EST 2008 x86_64 x86_64 x86_64 GNU/Linux

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4 sidharth April 4, 2012 at 4:46 am

I have some 3 nic cards on my system. I have removed all from /etc/sysconfig/network-scripts and want to assign a single ip to the system. But still in setup I can see 3 devices present. Please help..

Thanks in advance
Sidharth

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