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Re: [Snort-users] Linktype 113 not decoded

from [Martin Roesch] Network Security [Permanent Link]
Subject: Re: [Snort-users] Linktype 113 not decoded
Date: Fri, 25 Feb 2005 13:47:12 -0500
Looks like you're using cooked sockets (Linux SLL) to acquire the data and Barnyard doesn't know how to process them. You'd have to add a layer 2 decoder for linux SLL traffic before Barnyard will recognize those packets.

      -Marty

On Feb 24, 2005, at 10:12 AM, BALDWIN, BILL (SBCSI) wrote:

I'm running into an issue I hope someone can help with.

Environment:
Snort-2.3.0
Barnyard-0.2.0
Libpcap-0.7.2-7.E3.2
RedHat ES 3 update 3 SMP (2.4.21-20.Elsmp)

The system is running 2 GigE fibre cards that are spanning 2 routers
with no ip address and snort starts with -i any. The problem is the
alerts have no ip/udp header information. Looking at barnyards dump.log
I'm getting "Linktype 113 not decoded. Raw packet dumped" instead of
the packet header. If I run tcpdump or ethereal on any of the
interfaces, I am able to get all header info.

Any help would be greatly appreciated.

Bill



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--
Martin Roesch - Founder/CTO, Sourcefire Inc. - +1-410-290-1616
Sourcefire - Discover.  Determine.  Defend.
roesch@sourcefire.com - http://www.sourcefire.com
Snort: Open Source Network IDS - http://www.snort.org



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