From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: PCI passthrough issue
Date: Wed, 12 Jan 2011 13:32:42 -0500
Message-ID: <20110112183242.GA23125@dumpdata.com>
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> 
> 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.
> (limit seems to be around 100 bytes).

What does wireshark or tcpdump tell you when you send the larger packets?