This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


[Xen-users] Multiple NICs, different subnets, wrong default gateway bein

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Multiple NICs, different subnets, wrong default gateway being set
From: Q Wade Billings <wade@xxxxxxxxxxxxxxxx>
Date: Wed, 1 Jul 2009 15:31:59 -0600
Delivery-date: Wed, 01 Jul 2009 14:32:46 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx

I have a very wierd issue happening on a XEN DomU FC8 server. The issue is this:

I have eth0 set to DHCP. I have the DCHPD server offering up a router option setting and have verified via tcpdump capture that it is giving out this information correctly. I then have eth1 set to be static on a completely different subnet (without a gateway statement). When I do a service network start/restart, what happens is that the default gateway gets set to the IP address of eth1 and not the router received from DHCP.

When I place a GATEWAY statement in /etc/sysconfig/network-scripts/ifcfg-eth1 (the static interface) and set it to the gateway handed out by DHCP, it all works just fine and the default gateway gets set correctly.

So, it looks like the eth1 interface is stomping on eth0 and the DHCP information being passed to it.

I have two questions; 1) Why is this happening and 2) what can I do to fix it right? Setting the gateway in ifcfg-eth1 for the other interface seems hacky and wrong.

Thanks in advance for any help you have to offer.

Xen-users mailing list
<Prev in Thread] Current Thread [Next in Thread>
  • [Xen-users] Multiple NICs, different subnets, wrong default gateway being set, Q Wade Billings <=