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RE: Legal? Road Runner proactive scanning.
From: "Mark Medici" <mark () dbma com>
Date: Fri, 12 Mar 2004 18:31:38 -0500

From: Bryan S. Sampsel [mailto:bsampsel () libertyactivist org]
Sent: Friday, March 12, 2004 11:23 AM

If you're the customer.  However, if you're not the customer, they
have no
legal right to scan your resources.

That's a different matter, but still it's not illegal, at least not
under any law that I have seen.  But IANAL or a cop, YMMV and all that
stuff.  While I might not like someone scanning my ports, there is
nothing particularly bad about it, unless it is done in such a way as to
constitute a denial-of-service attack or harassment.  

Now, how the person scanning uses that information may be illegal
(attempting an exploit) or negligent (unauthorized disclosure to third

Port scanning is such a common and innocuous occurrence that there's no
reason for it to even be a part of your normal IDS alerts or reports.
Just block it and log it and ignore it unless/until there's an
escalation, then go back to the raw logs for evidence.  Of course, if
the port scans make it through to your DMZ or internal network, then I'd
want to see alerts from the IDS's in those zones.

As for testing all connecting SMTP servers for the presence of open
relay/proxy, I think this is a matter of self preservation and a feature
I'd personally like to see my MTA provide.  It's hard to argue against
something that makes good common sense.

If it makes you feel better or more secure to firewall-off every IP that
scans your ports or checks for open relays, then go ahead and do it.
But expect to keep busy, and potentially loose communications from bona
fide customers in the process.

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