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Re: AS400 telnet traffic
From: Skip Carter <skip () taygeta com>
Date: Thu, 20 Apr 2006 15:46:38 -0700

Telnet has the concept of the Network Virtual Terminal,
for which it sends control codes in-band.  The escape codes
you are seeing are those control codes.  Think of it as kinda
like curses for the NVT.

For details see:



On Thursday 20 April 2006 09:37, gamgamus () yahoo com wrote:

I have captured some AS400 telnet traffic with tcpdump on port tcp 23.

It seems to be encoded in some way, because I only can see a few initial
cleartext words, like: IBMRSEED, KBDTYPE, CODEPAGE, IBM-3477. The following
stream of words are unreadable with encoding or chiper.

When I see the dump with Ethereal, the decoded data are like:

\000\r\022\240\000\000\004 and goes on...

Does anyone known how to decode this capture to get the cleartext form?

 Dr. Everett (Skip) Carter           Phone: 831-641-0645 FAX:  831-641-0647
 Taygeta Network Security Services   email: skip () taygeta net
 1340 Munras Ave., Suite 314         WWW: http://www.taygeta.net/
 Monterey, CA. 93940            

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