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Special Forums IP Networking Interpreting [|llc] frames in enterprise traffic trace Post 302380586 by sstatla on Tuesday 15th of December 2009 03:16:16 PM
Old 12-15-2009
Java Interpreting [|llc] frames in enterprise traffic trace

The LBNL/ICSI Enterprise Tracing Project at LBNL/ICSI Enterprise Tracing Project - Project Overview provides a trace of an enterprise's network from 2005.

Upon reading these files with tcpdump, along with regular packets that appear like-
12:04:51.696971 IP 128.3.189.248.netbios-ssn > 128.3.44.26.ehome-ms: P 507590:507654(64) ack 168291 win 8484[|SMB]
12:04:51.729840 IP 128.3.44.26.ehome-ms > 128.3.189.248.netbios-ssn: P 168291:168354(63) ack 507654 win 64479[|SMB]
12:04:51.730201 IP 128.3.189.248.netbios-ssn > 128.3.44.26.ehome-ms: P 507654:507902(248) ack 168354 win 8421[|SMB]

there are some strange frames that show up-
12:04:51.781545 [|llc]34:c9:c8:fa:af:5e (oui Unknown) > a9:71:1d:9f:85:27 (oui Unknown), 802.3, length 404:
12:04:51.781670 [|llc]34:c9:c8:fa:af:5e (oui Unknown) > a9:71:1d:9f:85:27 (oui Unknown), 802.3, length 395:

I am trying to analyze these.
So far, I understand that-

1. The communication is between 2 devices that operate on the Data Link Layer, since IP address is missing. (802.3 wired ethernet switches?)
2. OUI- the Organization Unique Identifier is unknown because it is identified by the first 3 bytes of MAC address but the MAC address of the machines has been translated for anonymity purposes.
3. When I open this trace file using Wireshark, these particular frames show "Packet Size limited during capture" under the Info section. tcpdump has a default capture limit of 68 bytes and looks like these frames are bigger in size.
4. The ASCII payload in these frames is either
.q...'4....^.. or
.q...'4....^.}


So, the question is- Is this a legacy protocol/device? Has anyone come across anything like this?
Any information on this would be much appreciated.


Sunjeet
 

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REORDERCAP(1)						  The Wireshark Network Analyzer					     REORDERCAP(1)

NAME
reordercap - Reorder input file by timestamp into output file SYNOPSIS
reordercap [ -n ] <infile> <outfile> DESCRIPTION
Reordercap is a program that reads an input capture file and rewrites the frames to an output capture file, but with the frames sorted by increasing timestamp. This functionality may be useful when capture files have been created by combining frames from more than one well-synchronised source, but the frames have not been combined in strict time order. Reordercap writes the output capture file in the same format as the input capture file. Reordercap is able to detect, read and write the same capture files that are supported by Wireshark. The input file doesn't need a specific filename extension; the file format and an optional gzip compression will be detected automatically. Near the beginning of the DESCRIPTION section of wireshark(1) or <http://www.wireshark.org/docs/man-pages/wireshark.html> is a detailed description of the way Wireshark handles this, which is the same way reordercap handles this. OPTIONS
-n When the -n option is used, reordercap will not write out the output file if it finds that the input file is already in order. SEE ALSO
pcap(3), wireshark(1), tshark(1), dumpcap(1), editcap(1), mergecap(1), text2pcap(1), pcap-filter(7) or tcpdump(8) NOTES
Reordercap is part of the Wireshark distribution. The latest version of Wireshark can be found at <http://www.wireshark.org>. It may make sense to move this functionality into editcap, or perhaps mergecap, in which case reordercap could be retired. HTML versions of the Wireshark project man pages are available at: <http://www.wireshark.org/docs/man-pages>. AUTHORS
Original Author -------- ------ Martin Mathieson <martin.r.mathieson[AT]googlemail.com> 1.10.3 2013-07-28 REORDERCAP(1)
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