How many pfSense can I apply CARP to



  • Hi all, I have this problem, I already have 2 pfSense in CARP with 4 interfaces each machine, but I need to apply CARP to other 4 pfSense with 3 interfaces each, but they are not phisically near the first 2. And these other 4 should be master as well. So the thing is there would be a cluster with 5 masters and 1 backup. All the masters would not be each one near the other, they would be in different cities, and through a fiber cable they get to the same switch but in different networks, where the first master and backup are plugged. So would I need more interfaces in the backup?? can I use a switch or router to connect these others masters? ty



  • CARP only supports one master for any one group (at this time), I think you can have multiple backups.

    You probably want to look into OSPF for your setup.



  • @nicolas010:

    Hi all, I have this problem, I already have 2 pfSense in CARP with 4 interfaces each machine, but I need to apply CARP to other 4 pfSense with 3 interfaces each, but they are not phisically near the first 2. And these other 4 should be master as well […]

    If CARP interfaces don't match in same network segments it make no sense to "carp" over both networks ?

    I can guess what you want - as our 2 office setup it would be nice to configure with 1 Master "configuration" machine both places with each master/slave failover.
    But on the other hand it's better to have both places their own CARP regulation because you can have only up to 256 CARP addresses per Setup => on /24 and your finished ;)

    I've found here in forum some weeks ago a hint that there is a plan (sometimes in this century? ;)) to deploy a "cluster"-configuration tool for pfsense so that many pfsense clusters can managed at one place… that would be great ;)


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