Re: [Vserver] ifconfig problem with virtual interfaces

From: Björn Steinbrink <>
Date: Mon 23 Jan 2006 - 12:39:48 GMT
Message-ID: <20060123123948.GA7046@atjola.homenet>

On 2006.01.23 12:31:53 +0100, Raimund Specht wrote:
> Hi !
> We have a very strange problem here with virtual IP addresses (various
> up-to-date 2.6 kernels with vserver 2.0):
> Let eth0 have a normal IP address. Let v1 and v2 be two vservers with a
> virtual IP on eth0 each.
> # vserver v1 start
> # vserver v2 start
> ifconfig shows eth0, eth0:v1, and eth0:v2 as expected, everything works.
> # vserver v1 stop
> Now ifconfig shows that all virtual IPs have been removed although
> vserver-stat shows that v2 is still running. Networking with v2 doesn't
> work either. This only happens if the vserver, that was startet first, ist
> stopped. Other orderings work fine.
> This problem is not vserver related, we can reproduce it on non-vserver
> systems/kernels too. The following commands reproduce it on 90% of our
> systems (Debian, Ubuntu, Gentoo, all with Linux 2.6):
> # ifconfig eth0:1
> # ifconfig eth0:2
> # ifconfig eth0:1 del
> Does anyone else have this problem?
> Any workaround except defining an eth0:dummy interface outside any vserver?

Yep, that's default behaviour... :/

If you add the first address for a subnet, this becomes the 'primary'
address for this subnet, all later added addresses becomes secondaries.
Removing the primary address tears down all secondaries as well.

The common workaround is to have a primary address for each used subnet
on the host and only giving secondaries to the vservers.

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Received on Mon Jan 23 12:40:10 2006

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