[Dshield] testing a firewall

Erwin Fritz efritz at glja.com
Mon Dec 22 21:30:23 GMT 2003

There's a few of these tools around. The one I like is nmap. It's at www.insecure.org.

michael nancarrow wrote:

> Hi,
> 	I have recently deployed a new firewall system and spent
> 	a lot of time testing the new rules. The one problem I found 
> 	was that whilst I could test for known rules it was hard to test
> 	for unknown rules or unexpected results. Since we were not familiar
> 	with the new firewall we got some nasty surprises. What I was missing
> 	amongst the tool set was a means of getting every port from every
> 	ip address on the Internal network to respond. The idea being that
> 	I could do a complete port scan and guarantee a device behind the 
> 	firewall would respond if it got through. Does anybody no if such
> 	a tool exists ? everybody has been working hard to stop this type
> 	of response occurring on b/cast addresses but it can be handy at times.
> 	Particularly if you don't want to do the testing in-situ.
> thanks
> Mike

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