How to Create a Multihomed Host

Become superuser on the prospective multihomed host and do the following:

1. Create an /etc/hostname.interface file for each additional network interface installed in the machine.

2. Type:

   % touch /etc/notrouter

   This creates an empty file called /etc/notrouter.

3. Reboot the machine.

When the machine reboots, the startup script looks for the presence of the /etc/notrouter file. If the file exists, the startup script does not run in.routed -s or in.rdisc -r, and does not turn on IP forwarding on all interfaces configured "up" by ifconfig. This happens regardless of whether an /etc/gateways file exists. Thus the machine is now a multihomed host.