Configuring a host

This section guides you through the process of configuring the various hosts in your mini-Internet.

Nameing conventions

The interface to the router is called router-namerouter, e.g. JAKArouter for JAKA.

Show the current configuration

To show the current configuration for the host, use the following command:

ip address show

Changing the configuration

To change the IP address to an interface on the host, use the following command:

ip address add IP/SUBNET_SIZE dev INTERFACENAME

For example:

ip adddress add 111.0.222.3/24 dev BANKrouterOn

To remove an IP address, you can use the following command:

ip address del IP/SUBNET_SIZE dev INTERFACENAME

At this point, the host knows how to reach all the IP addresses with its own subnet. However, it does not know how to reach IP addresses outside their subnet. Hence, you normally add a route towards a default gateway at the house uses to reach all unknown IP addresses. To do that use the following command:

ip route add default via IP_ADDRESS

Continuing with our previous example:

ip route add default via 111.0.222.1

To see the current default gateway, use the following command:

ip route show
# or
netstat -rn

To delete past entries, use:

ip route del default via IP_ADDRESS