Linux Network Administrators Guide
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Chapter 9. TCP/IP Firewall
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9.6. Original IP Firewall (2.0 Kernels)
The first generation IP firewall support for Linux appeared in the 1.1 series kernel. It was a port of the BSD ipfw firewall support to Linux by Alan Cox. The firewall support that appeared in the 2.0 series kernels and is the second generation was enhanced by Jos Vos, Pauline Middelink, and others.
9.6.1. Using ipfwadm
9.6.2. A More Complex Example
9.6.3. Summary of ipfwadm Arguments
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