[ovs-discuss] Traffic forwarding issue between Xen domU/dom0 and ovs

Hans van Kranenburg hans.van.kranenburg at mendix.com
Fri Jun 29 09:41:18 UTC 2012


When re-reading my post from yesterday...

On 06/28/2012 08:21 PM, Hans van Kranenburg wrote:
>
> On the interface at the ovs (dom0) side, I can see arp requests, which
> are not being answered by the problematic host.
>
> # tcpdump -n -i domU-24-09
> tcpdump: WARNING: domU-24-09: no IPv4 address assigned
> tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
> listening on domU-24-09, link-type EN10MB (Ethernet), capture size 65535
> bytes
> 18:52:48.113540 ARP, Request who-has 10.140.36.9 tell 10.140.36.2,
> length 42
> 18:52:49.113556 ARP, Request who-has 10.140.36.9 tell 10.140.36.2,
> length 42
> 18:52:50.113552 ARP, Request who-has 10.140.36.9 tell 10.140.36.2,
> length 42
>
> But... inside the domU, no traffic is listed when dumping the eth4
> interface:
>
> # tcpdump -i eth4 -n
> tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
> listening on eth4, link-type EN10MB (Ethernet), capture size 65535 bytes

...I'm thinking this might as well be a regression or bug in xen or the 
linux kernel, because traffic is visible on the dom0-side of the 
network-interface of the domU... the arp requests do make it through ovs 
to the domU-24-09 in dom0

-- 
Hans van Kranenburg - System / Network Engineer
+31 (0)10 2760434 | hans.van.kranenburg at mendix.com | www.mendix.com



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