Ebook Design and Performance of the OpenBSD Stateful Packet Filter

Submitted by antoq on Thu, 01/22/2009 - 02:28.
a d v e r t i s e m e n t s
  • part of a firewall, working on IP packet level (vs. application level proxies or ethernet level bridges)
  • packet filter intercepting each IP packet that passes through the kernel (in and out on each interface), passing or blocking it
  • stateless inspection based on the fields of each packet
  • stateful filtering keeping track of connections, additional information makes filtering more powerful (sequence number checks) and easier (replies, random client ports)

    • Download Design and Performance of the
    OpenBSD Stateful Packet Filter


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