failover firewall

[network770]

is it possible to introduce a failover firewall without dedicating a interface on each firewall for connecting the two.  we currently have one asa and want to add another one for failover but all interfaces are used, do we have any options? can we do stateful failover over the internal network and not have a cable going between the 2 firewalls?

i have never seen such a configuration and would love to see an example if possible at all

[Roman Rodichev]

you must have an interface dedicated for failover, but it doesn't need to be a physical interface, it could be a subinterface through a dedicated VLAN on your LAN. If you already have trunking on your internal interface, just setup another subinterface and a new vlan.