I want to set up Active/Standby stateful failover. I only have 4 interfaces and 1 mgmt port. I have a outside, inside, and DMZ port configured. I want to use the last port for the stateful information and the MGMT port for the failover information. Is this the best (recommended) way to do this? Is there another way that would be better, possibly using the gig port for failover and stateful information?
Personally I would use your last gig port to do both failover and pass state information. The main thing is that the state link is a least the same speed as your fasted interface that you need to replicate. This is how I normally setup my customers firewalls.