Re: ICMP Scan

[Bill Weiss <houdini () clanspum net>]

tim logan(seclists () getemail net)@Tue, Mar 23, 2004 at 10:03:39AM -0600:
> I saw this traffic last night on an IDS system inside a firewall.  Can 
> somebody shed some light on it?  It looks to me like the purpose is to 
> determine the number of hops to the host in question.  If it is, what 
> would be the purpose?
[decrementing TTL]

Looks like a traceroute, with slightly different options.  Firewalk?

Traceroute normally increments the TTL, but the effect would be mostly the
same.

-- 
Bill Weiss
 
When the government fears the people, it is liberty.
When the people fear the government, it is tyranny.
        -- Thomas Paine


---------------------------------------------------------------------------
Free 30-day trial: firewall with virus/spam protection, URL filtering, VPN,
wireless security

Protect your network against hackers, viruses, spam and other risks with Astaro
Security Linux, the comprehensive security solution that combines six
applications in one software solution for ease of use and lower total cost of
ownership.

Download your free trial at 
http://www.securityfocus.com/sponsor/Astaro_incidents_040301
----------------------------------------------------------------------------