Date: Mon, 24 Sep 2007 12:57:19 +0200 From: Max Laier <max@love2party.net> To: freebsd-net@freebsd.org Cc: Cristian KLEIN <cristi@net.utcluj.ro>, Christopher Cowart <ccowart@rescomp.berkeley.edu> Subject: Re: Large-scale 1-1 NAT Message-ID: <200709241257.27219.max@love2party.net> In-Reply-To: <46F77C27.9050400@net.utcluj.ro> References: <20070924072517.GL19429@hal.rescomp.berkeley.edu> <46F77C27.9050400@net.utcluj.ro>
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[-- Attachment #1 --] On Monday 24 September 2007, Cristian KLEIN wrote: > Hi, > > Christopher Cowart wrote: > > Hello, > > > > We're working on expanding our wireless network. Unfortunately, we're > > running out of IP addresses (aren't we all). As much as I'd love to > > just tell everyone to use IPv6, that isn't gonna fly. The next plan > > to consider is using an RFC1918 pool and NATing the traffic. > > > > If only it were that simple. The security folks have mandated that > > anyone who can talk to the internet at large must be individually > > indentifiable. This means having hundreds of users NATing to a single > > internet-routable IP isn't happening. > > We used to have this problem too, for some NATed networks. The solution > which has been adopted is to capture the flows on the gateway and send > them the security team. The netflow protocol is very well suited for > this. > > > The real question is: what's the best way to dynamically update the > > NAT table? > > You may use IPFW with IPNAT or PF instead. PF is able to reload its > configuration without disruption. Moreover, because the state table is > not flushed during a reload, you can even move NATed clients from one > public IP to another, without them noticing. In fact pf comes with an almost ready-made sollution. Check out authpf(8) for details. -- /"\ Best regards, | mlaier@freebsd.org \ / Max Laier | ICQ #67774661 X http://pf4freebsd.love2party.net/ | mlaier@EFnet / \ ASCII Ribbon Campaign | Against HTML Mail and News [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.4 (FreeBSD) iD8DBQBG95gWXyyEoT62BG0RArAJAJsFohxWX58R9qWFN3gZBJbfKN3XYgCfeB2y +jtgieVrxM1nMQ32VikG1to= =djUd -----END PGP SIGNATURE-----
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