Routers use BGP (Border Gateway Protocol) , part of the TCP / IP protocol , to route between networks using different protocols. In a multi-homed network, the router uses Internal Border Gateway Protocol (IBGP) in S tub Domain , and EBGP (External Border Gateway Protocol) to communicate with other routers .
Multi-homing will make a difference if one of the connections to the ISP is broken. As soon as the router is assigned to connect to the ISP to determine that the connection is corrupted, the router will reroute all data through one of the other routers .
NAT can be used to extend routing for multi-homed , providing more connections.
Having fun!