Odd scans and stuff bouncing off firewalls

From: Nexus (nexus@patrol.i-way.co.uk)
Date: 08/13/02 

From: "Nexus" <nexus@patrol.i-way.co.uk>
To: <incidents@securityfocus.com>
Date: Tue, 13 Aug 2002 16:57:31 +0100

Just a quick straw poll to see if anyone has any hard data that supports the
logging and analysis of traffic that bounces off of filtering devices as
part of a business security plan ? Other than generating attack metrics to
wave under the noses of senior managment at budget time, is there any
definite _business_ requirement to have IDS sensors outside the firewall or
firewall "drop" logs et al regularly examined in the context of "external"
attack sources ?

 "We defended against X bazillion hack attacks last year so we need a bigger
budget for more stuff.."
BableFish (H2G2 version) : "Tons of port scans and worms from non
accountable netblocks bounced off of the firewall"

I don't bother to chase anything from anywhere unless it makes it through
the filters because I could care less and it would IMHO purely be a time
sink and even then only if it's from a netblock that has a whois abuse@
entry. As I said, this is purely my own view, on my own network knowing
the sheer amount of background radiation on the internet, so I would
appreciate some other points of view.

Cheers.

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