1

IP Routing

• Routing is the process of moving IP packets from one network to

another network.

• Routing involves two basic activities:

– Determining best paths.

– Forwarding Packets through these paths.

IP Routing

A B

C D

61.0.0.10

191.0.0.10

E0

E0

S0

S1

S0

S1

S2

S0

S1

S0

Source IP & Port61.0.0.10 - 3000

Destination IP & Port 191.0.0.10 - 80

DATAhttp

request

61.0.0.1 0

191.0.0.10

DATA

DATA

Source IP & Port 191.0.0.10 - 80Destination IP & Port

61.0.0.10 - 3000

DATAhttp

request

191.0.0.1 0

61.0.0.10

DATA

Routing Network Diagram

S0

172.16.0.1/16S1

172.16.0.2/16E010.0.0.1/8

LAN – 10.0.0.0/8

HYDE0192.168.1.1/24

LAN – 192.168.1.0/24

CHE

Head Office Branch Office

Conditions for Routing

• Head office Ethernet interface should be in the same network as

your Head office LAN and similarly on Branch office side.

• Head office and Branch office connected Serial interface should be

in same network.

• Head office LAN and Branch office LAN should be in different

networks.

• All interfaces of a Router should be in different networks.

Show diagram

Show diagram

Show diagram

Show diagram

Types of Routing

• Static Routing

• Default Routing

• Dynamic Routing

7

Static Routing

• Static routes are configured, maintained and updated by network

administrator manually.

• Administrator should know the destination IP network for

configuration.

• Administrative distance for Static Route is 1.

Administrative Distance (AD) is the “reliability” of the routing protocol. AD range is 0-255, lesser the administrative distance, higher the priority

Static Routing Configuration

S0

172.16.0.1/16S1

172.16.0.2/16E010.0.0.1/8

LAN – 10.0.0.0/8

HYDE0192.168.1.1/24

LAN – 192.168.1.0/24

CHE

Head Office Branch Office

Example 2Example 1