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BetaRide
Asked: 2012-06-14 06:27:23 +0800 CST

set-up webserver with two nics

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I have a web/email server with to nics, eth0 and eth1. I want to set it up, in order all WAN traffic is going through eth0 and all LAN traffic is going through eth1.

I found a number of descriptions and tutorials about policy based ip routing, but I'm still not sure how to configure the server. Any help about what routes, rules and iptables entries I need would be helpfull.

This is the network I'd like to set-up:

  ----------------------------            
  ! Gateway to internal LAN  !
  ! 192.168.26.1             !
  ----------------------------
         !
         !
         !
  -------------------------            
  ! eth1: 192.168.26.154  !
  ! Email / Webserver     !
  ! eth0: 192.168.26.153  !
  -------------------------            
         !
         !
         !
  ----------------            
  ! WAN Gateway  !
  ! 192.168.26.7 !
  ----------------
         !
         !
         !
  ----------------            
  ! WAN          !
  ! any address  !
  ----------------
networking iptables ip-routing centos6

1 Answers

  1. It does not work that way.

    Plug your WAN gateway, LAN gateway and "email/webserver" into a switch. Forget eth1 on your "email/webserver".

    Assuming the WAN gateway does NAT and forwards appropriate ports to the "email/webserver", and your internal LAN is either in the 192.168.26.0/24 subnet or is NATed by LAN gateway, you just set the default router for the "email/webserver" to be 192.168.26.7 and do fine with that. The WAN users will go via the default gateway, the local users will be handled by the implicit link-local route.

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