Configuring 2 network interfaces on an Alpha Server

From: Ernie Bisson, MIT Bates Linear Accelerator <BISSON_at_AESIR.MIT.EDU>
Date: Fri, 1 Mar 1996 16:12:39 -0500 (EST)

I have an AlphaServer running OSF/1 V3.2A, configured with 2 Tulip network
interfaces.

The 1st inteerface is connected to our main network.
The 2nd will be connected to a network, on which I wish to keep clear of
traffic from the main network.

>From the AlphaServer, I would like to be able to communicate with any node
on the same network as the 2nd interface. Plus, I would like to be able to
communicate to the main network from the 2nd network. I don't mind having
to connect thru the AlphaServer first in order to accomplish this.

On the AlphaServer, the name given to the 1st interface is "locus" and the
name given to the 2nd is "sucol". As a test, I created a network of 2 nodes
by connecting a workstation named "lob" directly to "sucol".

Telnet from "locus" to both "sucol" and "lob" failed.
Telnet from either "sucol" or "lob" to "locus" failed.

The only way I found to get communication between the 2 networks working,
was by adding a static route for "sucol" and "lob" to the routing tables
on "locus". I did this with the following commands,

   route add -host sucol 18.77.2.239 -interface
   route add -host lob 18.77.2.239 -interface

18.77.2.239 is the address of the 2nd network interface.

It appears as though "locus" does not attempt to communicate over the 2nd
interface automatically.

I would like to avoid having to add static routes for all nodes that will
be connected to the 2nd network.

Is there a simpler way to get between the networks?

I realize that sub-netting is probably a solution. However, we share 18.77
address space with other departments within MIT and are not guaranteed
consecutive addresses.

Configuration of the 2 interfaces is as follows,

   tu0: flags=c63<UP,BROADCAST,NOTRAILERS,RUNNING,MULTICAST,SIMPLEX>
        inet 18.77.2.238 netmask ffff0000 broadcast 18.77.255.255 ipmtu 1500

   tu1: flags=c63<UP,BROADCAST,NOTRAILERS,RUNNING,MULTICAST,SIMPLEX>
        inet 18.77.2.239 netmask ffff0000 broadcast 18.77.255.255 ipmtu 1500


Thanks for any help.

--------------------------------------------------------------------------------
Ernie Bisson
M.I.T. Bates Linear Accelerator
P.O. Box 846
Middleton, Massachusetts 01949-2846
(508) 774-2370 or (617) 253-9218

E-Mail : bisson_at_bates.mit.edu
--------------------------------------------------------------------------------
Received on Fri Mar 01 1996 - 23:08:22 NZDT

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