how to stop using *telnet <domain> 25*

[David A. Bandel]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On Sat, 24 Jan 2004 11:29:06 -0600
Ben Duncan <bns at meta3.net> wrote:

> I think the question here is :
> 
> Someone outside our network/domain is using a telnet to
> port 25 to use the MTA.
> 
> Anyone more familiar with iptables know if such a "service"
> can be blocked ?

not on a remote system.  IP headers do not contain information about the
originating application.  You'd have to be in the originating machine
very high up in the OSI stack to get that info.

IP headers get you soure/destination IP, source/destination ports, TOS,
and more, but nothing to help stop this.  However, if the system isn't
an open relay, this shouldn't work.

Ciao,

David A. Bandel
- -- 
Focus on the dream, not the competition.
		Nemesis Racing Team motto
GPG key autoresponder:  mailto:david_key at pananix.com
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.3 (GNU/Linux)

iD8DBQFAEq3oj31PLQNUbV4RAlxbAJ94yyy8ZOpcYtz7xd+FHEKfAPx52QCfTCQJ
yxXsxTahBmR3ykpUJBvQ0iw=
=pYmc
-----END PGP SIGNATURE-----