Date: Sat, 12 Sep 2009 15:09:13 +0200 From: Luigi Rizzo <rizzo@iet.unipi.it> To: Cypher Wu <cypher.w@gmail.com> Cc: freebsd-ipfw@freebsd.org Subject: Re: Transparent firewall & Dynamic rules Message-ID: <20090912130913.GA46135@onelab2.iet.unipi.it> In-Reply-To: <f9f38a550909120032k2572fd3y30a1a5e5d0b457cd@mail.gmail.com> References: <f9f38a550909120032k2572fd3y30a1a5e5d0b457cd@mail.gmail.com>
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On Sat, Sep 12, 2009 at 03:32:54PM +0800, Cypher Wu wrote: > 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. keepalives carry the addresses of the two endpoints, the firewall is not visible.
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