We are trying to setup a network whereby there are two routers, Router_A and Router_B. Both routers have their own ISP connection, so effectively IPADDRESS_1 and IP_ADDRESS_2.
Behind these routers we have an SBS 2003 server which is setup with to NIC cards in standard configuration (1 nic card for internet access pointing to ROUTER_A and one nic card for the local network).
We are trying to set it up so IPADDRESS_1/exchange and IPADDRESS_2/exchange both work. However currently only IPADDRESS_1/exchange works.
We have setup Router_B to forward all ports (DMZ) to Router_A. We have tried two different makes of router for Router_B however still have had no luck. We have also tried sending the traffic from Router_A and Router_B directly to the server, however this did not work either.
Should this be working? Or are we missing something?
P.S I appreciate that this looks like a scenario for a load balancing router, however we want to protect against the times that a router may fail, in this case the external clients only have to change the IPADDRESS they are connecting to.