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Re: Scan a subnet behind a firewall

from [Jesper S. Jensen] Network Security [Permanent Link]
Subject: Re: Scan a subnet behind a firewall
Date: Tue, 29 Mar 2005 08:56:15 +0200
Biswas, Proneet wrote: 
Is there any tool which can help us compare the results of the two scan
results - One is a scan from outside the firewall and one is from
inside, this could give us an idea of how good the firewall is?


We do this.

1.1 nmap inside the firewall
1.2 use nmap result in a scan inside the firewall
2.1 nmap outside the firewall with the result from the first nmap scan (much faster result unless your PC listens on MANY ports)
2.2 scan outside the firwall with the new nmap result

You now have 2 scans, one seen from your own LAN and one as any evil-hacker out there on the net.

It requiers two scanners, or some temp openings in firewall, but it gives a pretty good result.


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