IP Forwarding The story So far iP addresses are structure to reflect Internet structure Router iP packet headers carry these addresses When Packet arrives at router Examine header to determine intended destination Look up in table to determine next hop in path Send packet out appropriate port This/next lecture How to generate the forwarding table 9/28/2006 Lecture 10: Intra-Domain routing 29/28/2006 Lecture 10: Intra-Domain Routing 2 IP Forwarding • The Story So Far… • IP addresses are structure to reflect Internet structure • IP packet headers carry these addresses • When Packet Arrives at Router • Examine header to determine intended destination • Look up in table to determine next hop in path • Send packet out appropriate port • This/next lecture • How to generate the forwarding table Router