In a typical WAN scenario a WAN router would be connected to two Distribution Routers/Layer-3 switches for redundancy using routed (/30) Layer-3 links and be running an IGP (EIGRP or OSPF). If one of these links fails there is generally rapid failover and everything is happy...
If I replace this router for a PIX/ASA can I have this same scenario? i.e. two inside interfaces to the same internal networks?
Traffic from the same internal hosts could arrive on either 'inside' interface in the WAN router scenario due to equal-cost paths - is this possible with the PIX/ASA?
My understanding is the PIX creates state based on the source and destination interfaces and therefore allows the relevant traffic. If the sources traffic should arrive on different inside interfaces can this work?