Ch05- IP routing_1

Ch05- IP routing_1 - Internet Routing Routing is a Layer-3...

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Copyright © 2008 Thomas W. Bajzek Internet Routing Routing is a Layer-3 process performed by routers (gateways) that join at least two networks, to determine at any point where a packet should be sent to get it closer to its destination Routing protocols Routing protocols communicate routing information between routers (gateways) to enable them to make routing decisions There are two types of protocols Interior Exterior A C B 196.15.13.8 192.8.25.1 192.8.25.2 192.8.26.1 D 192.8.25.3 192.8.27.1 192.8.27.2 142.19.17.1 Pkt to 142.19.17.6?? 192.4.1.1
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Copyright © 2008 Thomas W. Bajzek Route A path through a network from source to destination Static routes do not change with time; dynamic routes do Routing Figuring out where to send a packet next on the way to its destination Routing is done on a hop-by-hop, network-by-network basis The information needed is next IP-address along the path for the given packet If destination address is on same subnet as host Host uses ARP to ±nd the Layer-2 address Host sends packet directly to destination via Layer-2 address If destination is on different subnet Host sends packet to a router (gateway) that knows routes, and connects beyond the local subnet
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This note was uploaded on 04/13/2008 for the course CS 123 taught by Professor Bajkzek during the Spring '08 term at Carnegie Mellon.

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Ch05- IP routing_1 - Internet Routing Routing is a Layer-3...

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