I have a
single ASA 5510 as a main Firewall , on the edge of my network. in case of any outage the of the firewall the complete network goes down, now i want to connect another ASA, so i have redudency . Which is the best possible method also if i go for ASA failover feature in place of HSRP do i have to get additional licence?
You would want a switch on the outside of the ASA as well. Some people have two for redundancy.
You would plug both the ASAs and the router on to this switch on the outside.