Date: Mon, 24 May 2004 15:31:13 +0200 From: "Simon Chang" <agentflicker@hotmail.com> To: freebsd-ipfw@freebsd.org Subject: ISP redundancy and with IPFW Message-ID: <BAY7-F31ZmZ4JlmSFWh000125d4@hotmail.com>
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Hello all, IPFW newbie question. I am lucky enough to have 2 ADSL connections with 6 static addresses on each router. I have a web server that needs to be always availaible from the internet for our road warriors. What I would like to do is give this web server a private address say 10.0.0.1 and put it behind a freeBSD/IPFW firewall. I would then like to nat this private address to a public address from each ISP's range. Say 100.1.1.2 for ISP1 (The ISP router address is 100.1.1.1) and 200.2.2.2 for ISP2 (The ISP router address is 200.2.2.1) This would mean that our roadwarriors could type into their browsers either http://100.1.1.2 or http://200.2.2.2 and arrive at the web server. The problem I'm not sure about is how to configure the return routing of the packets (I don't think I can use a default router on the firewall). Say for example ISP1 was down - 100.1.1.2 does not work, so the user types 200.2.2.2 the packet arrives at the firewall is natted to 10.0.0.1 and sent to the web server. The retun packet is returned to the firewall where the souce is "unnattted" to 200.2.2.2 (destination could be anything), how do I specify a rule that says for this source address (in ISP2's network) send the packet to ISP2's router (200.2.2.1)? Obviously I cannot route by destination address as this could be anything (for the return packets). Is this possible with IPFW? and Nat together? Has anyone a similar rule set that they could send me? Cheers, Simon Chang. _________________________________________________________________ MSN 8 with e-mail virus protection service: 2 months FREE* http://join.msn.com/?page=features/virus
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