Subject: Re: Traceroute difficulties
To: Dave Huang <email@example.com>
From: Steven M. Bellovin <firstname.lastname@example.org>
Date: 01/09/2003 06:58:26
In message <20030109083803.GL16074@azeotrope.org>, Dave Huang writes:
>Hmm... if you can ping it, there must be a route to it... the only thing
>I can think of is that the other end is sending back ICMP destination
>unreachable when you try to connect to port 25.
Some firewalls do that.
--Steve Bellovin, http://www.research.att.com/~smb (me)
http://www.wilyhacker.com (2nd edition of "Firewalls" book)