Turning On Space-Saving Mode
Space-saving mode provides the host with a table that contains only
the default routes. On a host, in.routed runs with space-saving
mode turned off by default.
If the host is not to have a full routing table (which provides increased
protection against misconfigured routers), turn space-saving mode on.
How to Turn On Space-Saving Mode
Become superuser on the host.
Edit the /etc/rc2.d/S69inet startup script by adding
to the line /usr/sbin/in.routed -q the -s option:
/usr/sbin/in.routed -q -s
/usr/sbin/in.routed -q -S