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Penetration Testing: Re: [PEN-TEST] Firewalking

Re: [PEN-TEST] Firewalking

From: Woch, Wojciech <Woch_W_at_ADMIRAL.FR>
Date: Thu, 8 Mar 2001 11:37:59 +0100

> What would be the best way to determine what kind of firewall is
> running on a server? Especially one that does not give out any
> banners. TCP-fingerprinting is not possible because there are
> no obvious open ports.

If it's a Firewall-1 v4.1 and you hit a Reject rule (one that generates a
RST+ACK from the firewall), within the IP header, the ID field will be 0 and
the original TTL set to 59.
Received on Mar 08 2001

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