I was wondering whether it's possible to define a same subnet that exist on both the inside and outside interfaces on a PIX 515 running ver 6.3(4). For instance a subnet of 10.10.1.0/24. I'm setting up the PIX to receive RIP routing update from the inside router for 10.10.1.0/24 routes. Also setup on the PIX is site-site VPN for 10.10.1.0/24 subnet. Under normal circumstances, the PIX will route traffic for 10.10.1.0/24 towards the inside router and should the WAN link to 10.10.1.0/24 fails, the router stopped advertising 10.10.1.0/24 to PIX. The PIX will then use a floating static route for 10.10.1.0/24 (with AD=5) to route traffic towards the site-site VPN.
So far I've been able to define floating static routes and configure passive RIP on the PIX. Then realised that I have to define the same subnet 10.10.1.0/24 on two different interfaces and I don't think the PIX will like this.
Thanks for your help.