If an interface exists for the PPP link
but your system is not connected to a LAN or
another WAN,
you do not need to run a routing daemon such as
routed(1Mtcp)
to maintain the routing table, but you may need to configure
a default route to the outside world over the PPP interface.
List the contents of the routing table using the command
netstat -rn. If a default route does not exist
to the remote end of the PPP link, use the following command
to add one:
route add default remote_IP_address
remote_IP_address is the IP of the remote end of the link as displayed by the ifconfig -a command. Use the PPP Manager to configure this as the default route as described in ``Network protocol options''. Do not configure such a system to act as a router or as a proxy for ARP.
If your system is connected to a LAN or another WAN, and it is configured to act as a router to forward packets between the various networks, you should at least run routed on it. Use the PPP Manager to check whether it is configured as a router as described in ``Network protocol options''. If a routing daemon such as routed is running, you should not need to configure a default route over the PPP link. If other systems on a LAN need to be able to contact systems at the remote end of the link which have the same subnetwork address, configure proxy ARP.
See ``Troubleshooting IP routing'' for more information about troubleshooting routing problems.