Become superuser on the prospective multihomed host.
Create an /etc/hostname.interface file for each additional network interface that is installed in the machine.
Type the following:
% touch /etc/notrouter
This command creates an empty file that is called /etc/notrouter.
Reboot the machine.
When the machine reboots, the startup script checks 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. The file also does not turn on IP forwarding on all interfaces that are configured “up” by ifconfig. This process happens regardless of whether an /etc/gateways file exists. Thus the machine is now a multihomed host.