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From: lr@cs.brown.edu (Luigi Rizzo)
Newsgroups: comp.protocols.tcp-ip
Subject: Network configuration problem
Message-ID: <75283@brunix.UUCP>
Date: 10 May 91 21:37:23 GMT
Sender: news@brunix.UUCP
Reply-To: lr@cs.brown.edu (Luigi Rizzo)
Organization: Univ. di Pisa (Italy)
Lines: 40

Hi there, we have the following configuration problem.
This is our network structure (all Ethernet running TCP/IP):

   global internet
      |
      R
      |    net1
   ------------------------------------------
	       |        |             |
	       A        B             C
	       |        |             |
   --------------  ------------  ------------
      net2           net3          net4

net1 will be connected to the global internet in the near future, via a
router (R).
The assigned Internet addresses for our department are 131.114.9.*,
and this appears to be the main source of problems.

Machines A, B and C are Unix boxes (HP9000 and others) with two
Ethernet interfaces. net2, net3, net4 are used to support communication
between groups of (disk/diskless) X workstations and their servers. Our
problem is to configure the network, especially the routing nodes
(A,B,C), so that each machine on each subnet can see the other and the
external world.
	Don't know about the router R, but apparently I can only use a
byte-aligned netmask on the Unix nodes. Thus each node on 'net1'
should be given a 'route' command for each node on the subnetworks,
instead of a unique 'route' for each subnetwork. Also, configuration of
the nodes on net2..net4 appears to be a problem (lots of 'route add'
for them, too).

Any ideas other than substituting A, B and C with bridges ?

	Thanks
	Luigi
==================================================================
Luigi Rizzo                Brown University & Univ. di Pisa
e-mail: lr@cs.brown.edu, luigi@iet.unipi.it
==================================================================