IP forwarding mechanisms Routing protocol(router only) ICMP redirect messages(host only) Router discovery protocol(host only) Manual configuration (router and host) IP packets IP Output router only IP forwarding table (compute the next hop) Network interfacesIP forwarding mechanisms 9 IP Output (compute the next hop) IP forwarding table Routing protocol (router only) ICMP redirect messages (host only) Router discovery protocol (host only) Manual configuration (router and host) IP packets Network interfaces router only