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Re: Sidewinder G2


From: Valdis.Kletnieks () vt edu
Date: Tue, 18 Nov 2003 11:20:06 -0500

On Tue, 18 Nov 2003 09:49:52 CST, "Perrymon, Josh L." said:
The cisco PIX doesn't run the actual SMTP service. The problem would be in
the Fixup for the SMTP protocol.

Hmm.. so we *don't* actually do SMTP, we merely screw with the bits in passing
even more than an actual SMTP relay would do (as it would just slap on a
Received: and keep going).  It answers a SYN packet on port 25, it sends a
distinctive '220 hello' reply different than what might be behind it, it
accepts EHLO/MAIL FROM/RCPT TO/DATA/QUIT, it isn't merely tunneling packets to
a server behind the firewall.

Pedantic sophistry at its best.  It's an SMTP server, guys. Looks like a duck,
quacks like a duck, and slapping a "this is a Fixup not a Server" label on it
isn't gonna remove the duck feathers.

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