Every router use a routing table to control the data-flow. Sometimes you have to set up the table. With this steps you can easy define the data-flow:

1. Describe the local networks
2. Describe the rest of all networks opposed to the standard-route
3. Describe the standard-route (0.0.0.0)

The standard route is the way through the network to the internet. If there is no internet connection you have to define the standard-route but probably you have an internet connection.

Lets do this with an example:

We want to set up the routing table for the router “West”.

• 10.0.1.0 (local) – by step 1
• 10.0.2.0 (next network opposed to the standard route) – by step 2
• 0.0.0.0 (standard route) – by step 3

Thats all to checkout the entries for the routing table.

One further thing: metric.

Metric are the units of the “hops”. If we are router “West” and we want to have the metric for the networks 10.0.1.0 and 10.0.2.0:

10.0.1.0 = local = 0 hops => metric = 0
10.0.2.0 = 1 hop => metric = 1

Thats all …