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
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