Policy based routing example

This tutorial explains the concept of policy routing with a practical example. Policy routing is a feature which is available on routers and operating systems , which allows to forward packets based on the source IP address in the IP header. Normally, when a packet is received on a router, it looks into the destination IP address to make the forwarding decision.

policy routing example

In the above diagram there are two network, which are and The router also has two internet connections. It is required that all packets originating from should be forwarded through one internet link and packets from forwarded to the other link. In a typical environment, all internet bound packets originating from the LAN network can be forwarded to either one of the internet links. With the help of policy routing, packets originating from a specific source network address can be forwarded out through the required interface. The router can be configured with policy routing to achieve the stated requirement.

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