Re: PCI passthrough issue

[Jean Baptiste Favre <xen-devel@jbfavre.org>]

Le 12/01/2011 22:40, Konrad Rzeszutek Wilk a écrit :
> 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..

tcpdump is available on my OpenWRT domU, but I can not perform tcpdump
and DNS lookup with only console access and AFAIK screen is not
available on OpenWRT

>> 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?

Fails as in:
# dig google.com

; <<>> DiG 9.7.2-P3 <<>> google.com
;; global options: +cmd
;; connection timed out; no servers could be reached

>>
>> >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.