Re: [Xen-users] Bridging works fine under KVM but not Xen

["Glenn E. Bailey III" <replicant@xxxxxxxxxxxxxxxx>]

On Fri, Jan 10, 2014 at 9:11 AM, John Jaser <john@xxxxxxxxx> wrote:
> Glenn:
>
> Did you run tcpdump -e on eth0, xenbr0, and the vif on Dom0, and eth0 on 
> DomU?  If so where does the icmp packet drop?  Does it make it to the dom0 
> eth0?

Ah, interesting question. For reference:

Network is 10.157.208.0/20

10.157.209.42 at 00:16:3e:18:36:11 - Guest OS
10.157.209.8 at 00:25:B5:00:02:FB - xenbr0 on host
10.157.208.1 at 00:07:7d:1a:79:93 - Gateway

Let's start with a dump from xenbr0:

10:52:45.077059 00:16:3e:18:36:11 > Broadcast, ethertype ARP (0x0806),
length 42: Request who-has 10.157.208.1 tell 10.157.209.42, length 28
10:52:45.077213 00:07:7d:1a:79:93 > 00:16:3e:18:36:11, ethertype ARP
(0x0806), length 56: Reply 10.157.208.1 is-at 00:07:7d:1a:79:93,
length 42

It see's the request and reply's back w/the correct MAC for the GW.

Now eth0 on the host:

10:48:15.190012 ARP, Request who-has 10.157.208.1 tell 10.157.209.42, length 28
10:48:15.190144 ARP, Reply 10.157.208.1 is-at 00:07:7d:1a:79:93, length 42

Same thing. But, if we look at the vif on the host:

10:53:45.713067 00:16:3e:18:36:11 > Broadcast, ethertype ARP (0x0806),
length 42: Request who-has 10.157.208.1 tell 10.157.209.42, length 28
10:53:44.713087 00:16:3e:18:36:11 > Broadcast, ethertype ARP (0x0806),
length 42: Request who-has 10.157.208.1 tell 10.157.209.42, length 28

We never see the answer come back.

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