Re: Strange TCP headers

[Michel Arboi <arboi () yahoo com>]

 --- pbsarnac () ThoughtWorks com a écrit : 
> The interesting thing is that a majority of the scans are originating
> from port 6346, which snort.org informs me is the gnutella server 
> port.

I suspect that your Pix is not decoding those packets (or fragments)
correctly.
If this is a new scanning technique, I hardly understand its use. Some
kind of fingerprinting maybe? They would use the 6346 port because it
might be unfiltered (on personal firewall at least), just like some
people used the 20 (FTP data) port to go through stupid stateless
filters.

> All those I've verified that at least
> two of the clients that these packets were directed to were running
> various file-sharing clients.

So I'd rather bet for 
1. an artefact created by the Cisco
2. some data corruption (bad phone line, deffective modem, whatever)
3. some IP layer bug


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