The Gateway Window allows you to configure the operation of the IPNetRouter
gateway.
IP Forwarding: It is possible to receive datagrams on an IP interface whose IP address is not an address for this computer. In this case, you can decide whether to discard such datagrams (normal behavior), or try to forward them on to their destination. Select "IP Forwarding: Never" to discard datagrams that are not addressed to this machine (RFC 1122 compliant). Use "IP Forwarding: Always" to always forward datagrams. Use "IP Forwarding: Automatic" to only forward datagrams when more than one IP interface is active (SunOS compatible).
In general, only designated routers should forward datagrams, but there are situations where you might want one machine to forward datagrams to another that would not otherwise have access to that network.
Remain Connected: Causes IPNetRouter to ping a PPP interface every three minutes and try to reconnect immediately if the PPP connection is lost for any reason.
Show PPP Dialogs: Enables the PPP modal dialogs to appear when connecting or disconnecting using OT/PPP.
Enable Local NAT: Allow Network Address Translation on datagrams received from other interfaces. This setting allows data from the LAN addressed to the public IP address of the gateway to be port mapped to machines behind the gateway. It also allows data masqueraded via the PPP interface to be reverse translated from an Ethernet interface for use with one way cable modems.
You can save an IP configuration (interfaces and routes) to a settings document and then restore this configuration later by opening the corresponding document. Since the "Interfaces" and "Routes" window show the actual interfaces and routes the IP module knows about, you can only open one document at a time to restore a previous configuration (since there is only one IP module). Use the "Upon Open" popup menu in the Gateway window to control what happens when a configuration document is opened (configure only, configure and display). This is especially useful for placing a settings document in your Startup Items folder to configure multiple IP interfaces each time your Macintosh starts up.
Detailed instructions for using IPNetRouter are available from the Sustainable Softworks web site at <http://www.sustworks.com>.