From: Avi Kivity <avi@redhat.com>
To: Harald Dunkel <harald.dunkel@aixigo.de>
Cc: kvm@vger.kernel.org
Subject: Re: kvm problem: bonding network interface breaks dhcp
Date: Wed, 04 Nov 2009 11:07:09 +0200 [thread overview]
Message-ID: <4AF1443D.8020109@redhat.com> (raw)
In-Reply-To: <4AF0502C.5010304@aixigo.de>
On 11/03/2009 05:45 PM, Harald Dunkel wrote:
> Hi folks,
>
> I am trying to use a bonding network interface as a bridge
> for a virtual machine (kvm). Host and guest are both running
> 2.6.31.5. Problem: The guest does not receive the DHCPOFFER
> reply sent by my dhcp server. There is no such problem if
> the host uses just a single network interface instead of
> bond0.
>
> Looking at tcpdump on the Linux guest there are several dhcp
> discover packages like
>
> 15:17:44.005306 00:16:36:2f:f1:d2> ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328) 0.0.0.0.68> 255.255.255.255.67: BOOTP/DHCP, Request from 00:16:36:2f:f1:d2, length 300, xid 0x4c31213d, secs 10, Flags [none]
> Client-Ethernet-Address 00:16:36:2f:f1:d2 [|bootp]
>
> The dhcp server receives these packages, and sends out
> a reply
>
> 15:17:45.927589 00:16:36:2f:f1:d2> ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 342: (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328) 0.0.0.0.68> 255.255.255.255.67: BOOTP/DHCP, Request from 00:16:36:2f:f1:d2, length 300, xid 0x4c31213d, secs 10, Flags [none]
> Client-Ethernet-Address 00:16:36:2f:f1:d2 [|bootp]
> 15:17:45.927658 00:15:17:94:16:65> 00:16:36:2f:f1:d2, ethertype IPv4 (0x0800), length 364: (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 350) 172.19.96.123.67> 172.19.97.243.68: BOOTP/DHCP, Reply, length 322, xid 0x4c31213d, secs 10, Flags [none]
> Your-IP 172.19.97.243
> Client-Ethernet-Address 00:16:36:2f:f1:d2 [|bootp]
>
> This reply never shows up on the guest.
>
>
>
Can you tcpdump on bond0, br0, vnet0, and the guest's interface to see
where the packet is lost?
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2009-11-04 9:07 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-03 15:45 kvm problem: bonding network interface breaks dhcp Harald Dunkel
2009-11-03 17:06 ` Matthew Palmer
2009-11-04 7:50 ` Harald Dunkel
2009-11-04 9:07 ` Avi Kivity [this message]
2009-11-04 11:02 ` Harald Dunkel
2009-11-04 11:09 ` Avi Kivity
2009-11-05 8:13 ` Harald Dunkel
2009-11-06 4:48 ` David S. Ahern
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