Dual ISP, PBF and DMZ

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L1 Bithead

@mikand I think that the server will not handle outgoing traffic properly. Having two default gateways configured doesn't mean that both are used. I don't think that any system responds to traffic using the same network interface as the one on which the traffic arrived (ignoring routing table).  So you end up with spoofing like behaviour from the FW's perspective. You would need PBR on server as well.

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L6 Presenter

Perhaps adding some iptables magic would do it but I think its to overwork the problem in this case if you go that far =)

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