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    CARP not working, IP Alias does ( solved : problem switch )

    Scheduled Pinned Locked Moved HA/CARP/VIPs
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    • N
      nicknuke
      last edited by nicknuke

      So we currently have 3 ISP, each with its own pfsense router.
      each ISP have 2 pfsense box for fail safe, both have Public IP CARPs
      We have no problems whatsoever with these 2 ISP.

      Now there is this new ISP, we're using fiber modem on our premise.
      I tried to add IP CARP on this pfsense box, but it can not be reached from outside. using tcptraceroute stop at some of the ISPs router.
      Then I tried to change the mode to IP Alias.... it worked, not sure why.

      What should I ask from the ISP about it ?
      I prefer CARP because we need to have failsafe when one box goes down.

      P.S : All pfsense are in virtualized environment ( KVM ).

      V 1 Reply Last reply Reply Quote 0
      • V
        viragomann @nicknuke
        last edited by

        @nicknuke
        The router has to allow MAC changes in short.

        When a device requests the MAC for the CARP VIP pfSense gives back the virtual MAC. Then the device sends its packets to this virtual MAC.
        However, when pfSense sends a packet to the device, it uses it's real interface MAC.

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        • N
          nicknuke @viragomann
          last edited by

          @viragomann
          Thanks for the insight..
          I happened to be able to log in to the router's admin mode. I think it's an ONT device.

          But, I suppose it does not make any difference ?
          I have to ask the ISP to configure it higher up on their router, am i correct ?

          S 1 Reply Last reply Reply Quote 0
          • S
            SteveITS Galactic Empire @nicknuke
            last edited by

            @nicknuke Per https://docs.netgate.com/pfsense/en/latest/troubleshooting/high-availability.html#other-switch-and-layer-2-issues you could try a switch between pfSense and the ISP router.

            Any particular reason you are using 6 pfSense routers and not two with 3 WANs each?
            https://docs.netgate.com/pfsense/en/latest/recipes/high-availability-multi-wan.html

            Pre-2.7.2/23.09: Only install packages for your version, or risk breaking it. Select your branch in System/Update/Update Settings.
            When upgrading, allow 10-15 minutes to restart, or more depending on packages and device speed.
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            • N
              nicknuke @SteveITS
              last edited by

              @SteveITS
              Thanks for the reply..
              I'm using a HP L2 switch, I have checked it and the only security option is Storm Control, and it is unchecked.
              Other 2 ISP are also plug in to the same switch, and the Carp is working. It's just this one ISP from their ONT modem, to this same switch and the carp on pfsense does not work. ( Other 2 ISP are just LAN cable since the ISP is in the same building )

              Actually the 2 ISP is our old ones.. they're in 2 master/slave pfsense router with CARP. pfsense is a kvm guest.
              Created another 2 pfsense master/slave just for this new ISP, so i can debug this without breaking another 2 ISP currently being used by users.

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              • N
                nicknuke
                last edited by

                It turned out it's faulty switch...
                Replaced it and all well..
                Sorry for the trouble and thanks for all suggestions !

                1 Reply Last reply Reply Quote 1
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