Comments on: Ubuntu Linux: Creating ethernet alias for eth0 network device

By: Michael

Michael — Sun, 18 Dec 2011 04:34:01 +0000

The reason you may be having problems w/ AUTO on an alias is that you are not allowed to use anything other than the default subnet for the ip range in question.

(Example: 10.x.x.x uses a default subnet of 255.0.0.0) If you try to assign any other subnet mask to the aliased ip, it won’t let you, and will take down the interface instantly. (Also true if you use ifconfig to assign the netmask).

Kind of ruins the point needing things like a server w/ several 10.x.x subnets, and forces one to use 192.168 addresses for 255.255.255.0.

Which would be fine if one didn’t already have a complex subnetted 10.x.x.x set of ranges in place because 192.168 doesn’t have enough subnets.

Really annoying that.

By: Alexis Wilke

Alexis Wilke — Tue, 20 Sep 2011 06:22:06 +0000

Mitter,

Yes. The limit is something like 254. It one byte. 0 and 255 cannot be used or something like that.

Alexis

By: Mitter Singh Thakur

Mitter Singh Thakur — Fri, 16 Sep 2011 10:24:34 +0000

Hi all,

Thanks!

Can you please tell me why there is limit to create an alias for NIC?

How many IP’s we can assign to a single NIC any Why???

regards,
Mitter Singh Thakur
System Admin
+91-7737603000 | +91-8890152367 | mitter1989@gmail.com

By: Anonymous

Anonymous — Thu, 21 Apr 2011 12:39:15 +0000

I have the same problem as Alexis Wike, Did anyone come up with a solution for this. After reboot the eth0:0 does not comeup. The auto eth0:0 line is there in the file but it seems that it does nothing. Thanks

By: Alexis Wilke

Alexis Wilke — Sat, 20 Nov 2010 06:59:23 +0000

That is exactly what I have in my file… including the auto eth0:0. However, it looks like the auto is not that automatic on a reboot. Have you had problems on a reboot? Wondering because I’ve seen many people running in the problem of the 2nd IP disappearing after the machine is restarted.

Thank you, Alexis

By: Ross Cooney

Ross Cooney — Mon, 14 Jun 2010 19:38:00 +0000

Thanks for the helpful tip.

By: Ross Sutherland

Ross Sutherland — Tue, 01 Sep 2009 11:20:52 +0000

Hell there. I am a new Linux user, more specifically Ubuntu. I was confused what was meant be the following line – “name Ethernet alias LAN card”. Is this the physical device name or just eth0?

Any help with this would be great thanks.

By: Download Free Photos

Download Free Photos — Mon, 31 Aug 2009 07:42:21 +0000

Hello,

Can I manually add IP to /etc/network/interfaces ?
Can someone post an example of multiple IP addresses on one NIC ?

thanks

By: Gaurav Pruthi

Gaurav Pruthi — Thu, 22 Jan 2009 05:38:26 +0000

Why we can’t use more than 254 aliases on a NIC?
If i am using 2 NICs in my box, will the max. limit be 508?

By: Manu Ignatius

Manu Ignatius — Tue, 25 Nov 2008 02:08:16 +0000

This link might be somewhat useful for aliasing an interface using programming. Link

By: Alex

Alex — Fri, 03 Oct 2008 12:36:30 +0000

When creating an alias, must it be in the same subnetwork?
To explain better, if my ip address id 1.1.1.1/255.255.255.0, the alias must be 1.1.1.x or can it be 2.x.x.x?

thanks

By: vivek

vivek — Wed, 16 Jul 2008 11:14:09 +0000

Jayesh, Use our Linux support forum

By: Jayesh Sharma

Jayesh Sharma — Wed, 16 Jul 2008 10:50:17 +0000

Hi All,
This is a very good site to linux learner.But how can i post my query to get resolution.

By: Zulqarnain

Zulqarnain — Tue, 27 Nov 2007 07:53:00 +0000

i solve my problem of multi addresses.

By: jusdur

jusdur — Wed, 08 Aug 2007 03:12:18 +0000

what does mean this line:
name Ethernet alias LAN card

i look into man interfaces, but can’t found about name syntax

thx

By: Alex

Alex — Sun, 28 Jan 2007 06:23:08 +0000

What if you don’t use a permanent ip address and
rely on DHCP to assign the IP address?

Is this correct?
sudo ifconfig eth0 up

Do I need to setup dhcp?

By: Tamil

Tamil — Thu, 28 Dec 2006 11:08:47 +0000

simple and good guide. Thank you.

By: Cloudless

Cloudless — Fri, 04 Aug 2006 08:20:36 +0000

Thank you so much for this guide! It is easy to understand.

By: LinuxTitli

LinuxTitli — Sun, 18 Jun 2006 06:26:16 +0000

kotnik,

Err…

thanks for heads up :)

By: kotnik

kotnik — Sat, 17 Jun 2006 19:15:23 +0000

/sbin/infconfig

There’s no such command. Fix the typo ;)