RE: [PEN-TEST] Detecting the presence of a firewall

[Frank Knobbe <FKnobbe () KnobbeITS com>]

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> -----Original Message-----
> From: railwayclubposse () hushmail com
> [mailto:railwayclubposse () hushmail com]
> Sent: Monday, May 14, 2001 11:44 AM
>
> For Checkpoint, use nmap and do a TCP and OS detection scan. 
> If they are 
> doing one-to-many NAT the machines will be detected as 
> "behind a Checkpoint 
> Firewall-1 4.1 SP2 Server" or whatever. The firewall itself 
> is likely to 
> have some combination of  TCP ports 256-259, 264-265 open for 
> management,
> auth, key exchange, etc. 

What criteria is nMap using? What would the result be if a) the
well-known-Checkpoint-ports are closed, and b) the default TTL has
been monkied with? (Not you, Doug)

Regards,
Frank

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