PPP gateway
A PPP gateway is a TCP/IP gateway that has
one or more PPP network interfaces.
A TCP/IP gateway is a machine that has been configured to
forward IP packets that are not addressed to itself.
If a TCP/IP gateway has PPP network interfaces,
it will forward packets
that are either received over a PPP connection or
are addressed to a remote system accessible via a PPP interface.
See ``Configuring a PPP gateway'' for instructions.
A system can also be configured as a gateway by setting the values of the TCP/IP parameters ipforwarding and ipsendredirects to 1. This enables packets to be routed between all network interfaces on the machine. For more information, see Appendix C, ``Configuring TCP/IP tunable parameters'' in the Performance Guide.
You may want to use proxy ARP on a PPP gateway; see the following section.