I am wondering how a certain subnet gets routed into the DR site using BGP during a disaster scenario.
We have our Main site that has an Internet router with an ethernet IP Address 220.127.116.11 (not real)
Our firewall at the Main site has it's outside interface in this subnet and all web servers under normal conditions are NATed to this subnet thru firewall. Our hosted DNS Zone file has host names resolving to this subnet.
During a failover where the Main MPLS router is shut down, the DR site is supposed (has been tested)to start advertising the 18.104.22.168 subnet out of the DR site. The web clients have connectivity to the DR servers via static NAT translations from the 22.214.171.124 subnet.
Does the BGP advertise this route and has the DR internet router as it's Next hop? to get to it?
If so, the DR PIX that has the static NATs set up in the 126.96.36.199 (Main Site) subnet on the outside Interface, has it's outside interface configured in the DR subnet of 188.8.131.52 subnet.
Are the static NATs in the DR PIX to the Main Site Internet subnet, like secondary addresses on routers?
I don't see how this works, attached are configs.
If I wanted to put a device (CSS) to redirect the servers on the inside network, I am not sure how I would set up the interface in between the router and the PIX.