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Re: [Xen-devel] PCI passthrough issue

On Wed, Jan 12, 2011 at 09:07:30PM +0100, Jean Baptiste Favre wrote:
> Le 12/01/2011 19:32, Konrad Rzeszutek Wilk a écrit :
> >>
> >> Finally, I think that my setup shall not be responsible for the fact
> >> that ping works, small DNS answers are received but not bigger ones
> > 
> > Aah, somehow I missed that fact.
> Seems yes :)
> >> (limit seems to be around 100 bytes).
> > 
> > What does wireshark or tcpdump tell you when you send the larger packets?
> That's one of my problem: nothing special :(
> I can only run tcpdump on my gateway (no SSH available on my OpenWRT
> domU and only xm console access is available).

You can install (or just compile it statically) tcpdump on your OpenWRT,
or just hook it up to a beffier guest..
> I see DNS requests comming in, I see DNS answers going out.
> ARP requests are fine.
> As an example:
> dig free.fr works
> dig jbfavre.org works
> dig amazon.fr works
> dig amazon.com works (quite long, but works)
> dig google.fr fails
> dig google.com fails

Fails as in response or fails halfway?
> >From another machine in the same LAN, all requests work fine.
> Thought this was due to some ARP restriction setted up by default in
> OpenWRT, but in this case, I can not explain why some DNS lookup do work
> and some don't.
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