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    DHCP for 2nd WAN i/f & modem half bridged help

    Problems Installing or Upgrading pfSense Software
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    • R
      rgunn
      last edited by

      Hi, I'm tearing my hair out trying to work around this…

      I have two WAN interfaces:

      1. WAN - ADSL2+ full bridge mode PPPOE under pfsense works great. Provider: IINET

      2. OPT2 - ADSL2+ half bridge mode using PPPOE. Interface reports identical IP address (which is my correct static IP) to that of the gateway (which is wrong, should be gateway address of the provider). Provider: TPG

      WAN2 interface (em3)
      Status up
      DHCP up 
      MAC address XX:XX:XX:XX
      IP address  XXX.XXX.XXX.124 
      Subnet mask 255.255.255.0
      Gateway XXX.XXX.XXX.124
      Media 100baseTX <full-duplex>In/out packets 108/173 (31 KB/53 KB)
      In/out errors 0/0
      Collisions 0

      Each WAN interface use a TP-LINK 8840 modem.

      Can anyone give me some clues how to debug this ?

      thanks

      Richard</full-duplex>

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      • R
        rgunn
        last edited by

        just to clarify each WAN i/f has its own modem/line/provider. The first WAN i/f is working (I'm using it now) Further reading suggests that the duplicate IP and gateway information might be correct on the second WAN i/f but I am not sure.

        NAT and Firewall rules are correct. If I switch the outbound NAT from WAN (the one I am using now ) to OPT2 (second WAN which use DHCP & half bridge modem) traffic doesn't get out.

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        • H
          hoba
          last edited by

          The subnetmask for such a configuration (IP and Gateway identical) should have a /32 subnetmask or a 255.255.255.255 in other notation. If you can't get this fixed at the modem or by the ISP just set the modem to router mode and create another private subnet between the modemrouter and the pfsense. Then set the pfSense IP as DMZ IP in the modemrouter and it should work. You should of course use an external monitor IP for that link then.

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          • R
            rgunn
            last edited by

            Thanks. Could you explain why if I connect using the modem & PPPOE (bypassing pfsense) I get my static IP address and a different gateway address (as I would expect), yet when using half bridge in the modem with PPP extensions and pfsense that g/w address is not passed to pfsense via dhcp ?

            I have tried using both DHCP & static mode for the OPT2 WAN i/f.

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            • H
              hoba
              last edited by

              It's either an issue with the modem in halfbrige mode or the ISP I think.

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              • W
                Wasca
                last edited by

                I have a similar situation.

                My WAN is doing a Full Bridged connection ADSL2+ with TPG

                My WAN2 (OPT2) is a Symetrical link static IP. If I disconnect th WAN link it brings down my WAN2 link I can't ping to any IP's on my DMZ (Routed via WAN2)

                What is going on?

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