Failover cluster with two 3 LAN pfSense system

[decibel83]

Hi.

I'm studying about creating a failover cluster betweekn two pfSense systems and I read this tutorial http://pfsense.basis06.com/download/tutorials/carp/carp-cluster-new.htm.
This tutorial shows that the OPT1 interface is used to sync the two pfSense systems, but I should use it for WAN2 network (the second WAN connection in failover and with some connections routed on it).

The problem is that I have only 3 interfaces on the two pfSense systems, can I sync them using the LAN interface and not the OPT1 one?

Thank you very much!
Bye.

[jimp]

You can sync on LAN, but it's not ideal.

[decibel83]

Why?

[jimp]

There are security issues with doing state sync on LAN, and it can consume a significant amount of bandwidth depending on the rate at which states are added/removed.