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Re: Data in SYN Packets
From: Mark Newman <mnx () UTK EDU>
Date: Mon, 26 Mar 2007 18:09:07 -0400

the 3DNS theory is as close to being reasonable as anything anyone could
suggest...without seeing a full packet dump...so, even though I love
that darn Google...searching through a packet dump is a better place to

...with many commercial IPS/IDS, you get lots of fancy signatures,
flexibility in response, a supposedly better ~approximation~ towards
anomaly detection, blobbity-blah-blah...but, aren't privileged enough to
see the actual structure of the signatures...(may the sun continue to
shine forever on open source)

...to have the most accurate understanding of what is really happening
you have to be able to (1) see and understand the stimulus/response (the
packets), (2) understand how the stimulus/response is processed by the
100 gajillion dollar IPS/IDS (the structure and inner workings of the
signature, etc. - yeah, right), and (3) distinguish and understand the
"alert" or "response" (if you get one...) as useful or...not

Mark Newman
University of Tennessee, Knoxville

On Mon, 2007-03-26 at 15:51 -0400, scott hollatz wrote:
Hash: SHA1


In our IPS log I see the following entry *TCP C2S Ambiguity: Data in
SYN Packet* daily directed towards our DNS server. These packets are
coming from four or so different addresses in China.  I did a brief
Google search with results being a few or more years old. A couple
the posts reported the same *Data in SYN Packet* with the
originating addresses also from China.

Can anybody shed light on this?

Thank you very much.

Could be 3DNS software for measuring DNS response time to find
response to web requests, ususally measured from several systems.

Mike Hanson
Network Security Manager
The College of St. Scholastica
Duluth, MN 55811

( mailto:n () css edu )

- --
scott hollatz                                        net
shollatz () d UMn eDu
information technology systems and services          tel +1 218 726
university of minnesota duluth mn usa                fax +1 218 726

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