Local: Firewalling  

Linux: Firewalling - Testing

Version: 0.04 from 2001-06-05
Copyright 2001 by Peter Bieringer <pb@bieringer.de>, original site of publishing: http://www.bieringer.de/linux/firewalling/
Unlimited non-commercial distribution of this document in its entirety is encouraged - please contact the author prior to commercial publication.

Suggestions, comments and improvements are welcome!


Changes to

Testing of firewall configuration

After successful setup of a firewall ruleset it's very recommended to test this setup from outside (and perhaps also from inside).
One of the best tools around for that is nmap (http://www.insecure.org/nmap/).

If you have need for a commercial auditing, then look e.g. at http://www.aerasec.de/security/services/, they offer different kind of.

Local test using netstat

Local and remote test using nmap


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