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4 - Static and dynamic routing

Published online by Cambridge University Press:  05 June 2012

Shivendra S. Panwar ,
Shiwen Mao ,
Jeong-dong Ryoo  and
Yihan Li
Shivendra S. Panwar
Affiliation:
Polytechnic University, New York
Shiwen Mao
Affiliation:
Polytechnic University, New York
Jeong-dong Ryoo
Affiliation:
Electronics and Telecommunications Research Unit, South Korea
Yihan Li
Affiliation:
Polytechnic University, New York
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Summary

We hoped that we could find a way to permit an arbitrary collection of packet-switched networks to be interconnected in a transparent fashion, so that host computers could communicate end-to-end without having to do any translations in between.

Vinton G. Cerf

Objectives

  • Comparison of router and bridge.

  • IP forwarding.

  • Use of ICMP messages in routing.

  • The Routing Information Protocol (RIP).

  • The Open Shortest Path First (OSPF) protocol.

  • Static routing by manually building the routing tables in the routers and hosts.

  • Use of Traceroute to find an end-to-end route.

Static and dynamic routing

Routing is the act of transferring packets from a source to a destination using network layer protocol information. It involves two activities, determining optimal routing paths and transporting packets through an internetwork. The key to these two activities is the routing table maintained in each host and router. The routing table records optimal routes and is consulted when a forwarding decision is to be made for an arriving packet. The routing table can be manually set, updated by an ICMP message received, or by routing daemons implementing dynamic routing protocols.

Next-hop routing

When a host needs to send a packet to a destination, it uses its own netmask and the IP address of the destination host to find out the network and subnet ID (or the extended prefix) of the destination.

Type
Chapter
Information
TCP/IP Essentials
A Lab-Based Approach
 , pp. 77 - 99
Publisher: Cambridge University Press
Print publication year: 2004

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