On 20 May 1998, Jake Colman wrote:
> I have a small private Class C network in my home office consisting of a Linux
> box and several Win boxes.  This network is up and running correctly.  I now
> have to add in an ISDN router to connect my home office network to my main
> office network.  The main office network uses a different set of addresses and
> is not part of my private Class C network space.  My goal is to have my Linux
> box resident on both networks and to allow all nodes on my private network
> access to the main office network.
> 
> To do this, do I need to add a second NIC to my Linux box or can I just add a
> second IP address to my single NIC?  What else might I have to do to live in
> both spaces at same time?

Most ISDN routers have no problem with "single address network
translation". For example, the little Bay Nautica 200 that lives on a
shelf above my computer is doing exactly that.

I assigned the Nautica two addresses: a local (192.168.0.x) address for
its Ethernet interface, and a remote (218.214.x.x) address on the remote
network for its PPP interface. The remote end is a 3com Total Control
access server, but just about any ISDN router can be on the remote end and
work properly if the routing tables are properly set up so that it'll
generate a proxy ARP for the PPP interface. I then set the Nautica into
"transparent proxy network address translation" mode, which works kind of
like IP Masquerading under Linux except not quite as reliable (:-( ). I
also set the Nautica to forward incoming connections to my main Linux
server machine so that I could get print jobs from remote systems.

The end result: My local network appears to be one machine to the central
site, but every machine on my local network can access the central site as
if it were directly connected.

Eric Lee Green   [EMAIL PROTECTED]          Executive Consultants
Systems Specialist               Educational Administration Solutions
             See http://members.tripod.com/~e_l_green



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