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Date:	Tue, 15 Apr 2014 01:34:47 +0000
From:	Dennis Punjabi <>
To:	Atzm Watanabe <>,
	Daniel Borkmann <>
CC:	Toshiaki Makita <>,
	"" <>
Subject: RE: 802.1AD packets - Kernel changes ether type from 88A8 to 8100
 on all packets.

>>> Hi.
>>> Though I'm not an expert with libpcap, I feel tcpdump sometimes shows a
>>> wrong vlan protocol (if vlan_tci is used).
>>> Maybe this topic has relevance?
>>> packet: deliver VLAN TPID to userspace
>> The issue seems not to be in AF_PACKET as it just 'playes dumb' and propagates
>> what has been set in the skb as metadata to user space e.g., see ...
> Yes.
> Also I sent a small pull-request for libpcap via github to fix this
> issue about 2 weeks ago, but it is not pulled yet, still opened:

Thanks Atzm and everyone for clarifying that and pointing me in the right direction.
Was not too sure where to begin looking.

I will apply the individual patches and try the 802.1AD filtering on the bridge.
Appreciate your help.

Best Regards,
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