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Date:      Sat, 12 Sep 2009 15:32:54 +0800
From:      Cypher Wu <>
Subject:   Transparent firewall & Dynamic rules
Message-ID:  <>

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I want to build a transparent firewall based on IPFW. For static rules
this is fine, but for dynamic rules, ipfw uses keepalive packet to
avoid deleting a dynamic rule that both ends are still alive but don't
issue any traffic for a long time. But this means the firewall should
have it's own IPs and is not transparent anymore.

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