Could not find a matching real interface subnet for the virtual IP

  • Hi all,

    I am trying to set up CARP with 2 pfSense boxes.
    Both are running 2.1.3, same hardware.

    When I synchronise the master to the slave, I have one issue with 1 of the 3 Virtual IP, with the following message:
    "Sorry but we could not  find a matching real interface subnet for the virtual ip address"

    My real interfaces are configured correctly, and I do not understand why it cannot set the VIP.

    Master interface: vlan 254, IP
    Slave interface: vlan 254, IP
    Virtual interface: IP

    So, when it sync, the VIP is attached to the pfsync interface, which is not good.

    You can see attached the screenshots of my config.

    Any idea on how to resolve this issue?

    Thanks for you help,


  • Rebel Alliance Developer Netgate

    With a CARP setup the order of the interfaces on Interfaces > (assign) must be identical, including any internal identifiers for the names (e.g. wan->wan, lan->lan, opt1->opt1, opt2->opt2)

  • OK, indeed the network interfaces are not in the same order on the master and backup server.

    Is there an easy way to reorder the interfaces?

  • Rebel Alliance Developer Netgate

    get a backup, edit the interfaces, restore the backup

  • ok thanks, I will try tomorrow, thanks a lot!

  • Hi,

    it works fine now, thanks!

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