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Old 11-09-2010, 06:03 PM   #1
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free firewall testing


I would like to test my firewall rules. Is there some app or web service where I can do that ?

thx for help.

Last edited by drManhattan; 11-09-2010 at 06:16 PM.
Old 11-09-2010, 08:43 PM   #2
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Originally Posted by drManhattan View Post

I would like to test my firewall rules. Is there some app or web service where I can do that ?

thx for help.
grc might can help in your endeavor.
Old 11-10-2010, 01:15 PM   #3
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...that's a good answer (one of several possible) provided that you mean 'external testing for holes' rather than 'testing from inside, to ensure that all of my service work', which is a rather different problem...
Old 11-10-2010, 01:26 PM   #4
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You can use nmap

Kind regards
Old 11-10-2010, 03:28 PM   #5
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To do firewall testing you have to first know whether you will be testing from inside or from outside. Then you have to decide whether you will be whitebox testing (knowing and specifically targetting rules) or black box testing (without targeting specific rules / a scatter technique )

Next, you should make sure that anyone that uses your firewall is aware that you are doing it -- ie, don't do it during peak business hours or anything.

Once you have that figured out, and I am assuming that you do own this network and firewall, you should use various scanning techniques to ensure that your traffic is filtered. Most are advanced, but have simple starting points. Also, vulnerability scanning will usually get you a nice easy to read report of what goes through and what is found.

Some popular scanners and testing suites are: nmap, gfi languard, nessus, hping, and scapy.
Old 11-10-2010, 04:11 PM   #6
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re: grc ....and to test your iptables you need to be using a bridged firewall if you have a router/modem that has its own firewall active.

Otherwise, grc and pcflank and similar external sites are testing your modem/firewall
Old 11-12-2010, 03:37 AM   #7
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Moved: This thread is more suitable in Linux Security and has been moved accordingly to help your question get the exposure it deserves.


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