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What are some reasonable filtering rules for a kernel-based packet screen?
Java Security,Windows code security, Windows Server 2003 Security,Internet Explorer 7 Security and Internet Firewalls questions and answers
(Continued from previous question...)
What are some reasonable filtering rules for a kernel-based packet screen?
This example is written specifically for ipfwadm on Linux, but the principles (and even much of the syntax) applies for other kernel interfaces for packet screening on ``open source'' Unix systems.
There are four basic categories covered by the ipfwadm rules:
-A
Packet Accounting
-I
Input firewall
-O
Output firewall
-F
Forwarding firewall
ipfwadm also has masquerading (-M) capabilities. For more information on switches and options, see the ipfwadm man page.
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