netdev - Re: accelerated vlan gives pcap tagged packets untagged

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Message-ID: <49903200.6040408@trash.net>
Date:	Mon, 09 Feb 2009 14:39:12 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Pierre Ossman <drzeus-list@...eus.cx>
CC:	Francois Romieu <romieu@...zoreil.com>, netdev@...r.kernel.org
Subject: Re: accelerated vlan gives pcap tagged packets untagged

Pierre Ossman wrote:
> On Mon, 09 Feb 2009 14:23:01 +0100
> Patrick McHardy <kaber@...sh.net> wrote:
> 
>> Current kernel version (I think starting with 2.6.28) relay the
>> VLAN tag information to userspace through packet sockets. The
>> current libpcap release from tcpdump.org (or the one Dave keeps
>> in a git tree on kernel.org) supports reconstructing the tags.
>>
> 
> Ah. This is a Fedora 10 machine so it's running a 2.6.27 kernel. I'll
> see if I can do a test with an updated kernel.
> 
> Do you know if dhcpd also uses libpcap so that it will stop seeing
> packets it shouldn't?

I believe it depends on compilation options (but usually does on
modern distributions).
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