my network is illustrated in the figure bellow.
i need to connect two ISP's to cisco "1841 router". one comes form serial cable and the other comes from Ethernet cable and make redundancy between them. if ISP 1 goes down then automatically the router will transfer the traffic to ISP 2.
also, the PC's shown bellow needs remote access from internet and routers (Router1, Router2, Router3) all needs public IP's.
note: all traffic will go through one ISP, and no load balance is implemented.
can you please tell me if this solution is possible or not on (1841 router)?