Description

This article is from the AmiTCP/IP FAQ, by Mike Meyer with numerous contributions by others.

8.10: How do I set up other hosts to reach the internet via my SLIP line?

Before you do anything else, get IP address(es) for the other hosts from
your service provider. Your service provider has to arrange to send
packets for those IP addresses to your Amiga, so that it can forward them
to the appropriate hosts. Unless your provider is forwarding those packets
to your Amiga, nothing else will work, so don't even try. Note that your
provider is not obligated to provide this service to you, unless you have
a contract that says they are. Some providers will refuse to do so. 
Next, install TCP/IP on your other hosts. The default gateway address
should be the IP address of the gateway Amiga (the one that is connected
to the external SLIP line). For a SLIP connection, the destination IP
address should also be the gateway Amiga. 
Finally, configure the gateway Amiga. For SLIP interfaces, you can use the
same IP address for each line, with the destination address being the
address of the host on the other end of the line. Presumably, you're going
to use the same SLIP driver, so configure the second interface similar to
the first, changing only the device name and unit number. You may want to
turn off carrier detect. Copy the ifconfig line in amitcp:bin/startnet,
changing the destination IP address and SLIP device and unit to the values
for the SLIP connection you are adding. Last - but not least - edit
amitcp:db/amitcp.config to set gateway=YES instead of NO. 
Assuming that everything was done properly - by both you and your network
provider - you should be able to reboot the gateway and internal machines,
and have everything work. Testing should proceed along the same lines as
setting up an initial SLIP line: make sure your machines can talk to each
other, then try talking to the first external destination, then try
reaching the internet at large.  

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