Looking to set up CARP, have a few questions



  • I understand the normal setup for CARP requires multiple IPs on both the WAN and LAN side.
    I have that, but not in the "normal" sense:
    My ISP provides me with a /30 (so 2 useable IP addresses, one of which is my pfsense WAN IP and the other is its gateway IP)for my public IP, with an additional /28 (in a different address space) routed to my pfsense WAN IP.

    Example with numbers (yes, the 10.x.x.x subnet isn't public, these are just examples):
    pfSense WAN IP: 10.1.1.42/30
    WAN_GW: 10.1.1.41

    Additional External IP Addresses: 10.3.67.160/28

    How can I set up CARP in this situation?



  • You can't. Your interconnect with your ISP must be a /29. They should be willing to switch you over to that, it's not an uncommon request since basically every router/firewall redundancy protocol requires it.



  • also make sure they're routing your internal subnet to a CARP IP so it goes to the current master firewall.



  • @cmb:

    You can't. Your interconnect with your ISP must be a /29. They should be willing to switch you over to that, it's not an uncommon request since basically every router/firewall redundancy protocol requires it.

    Ok, thats what I thought.
    I'll see about getting that changed.


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