Newsgroups: comp.parallel.pvm
From: amf@amf.ucns.uga.edu (Alan Ferrenberg)
Subject: Re: Can PVM work with fire walls / two networks?
Organization: University of Georgia, Athens
Date: 2 Aug 1994 12:59:09 GMT
Message-ID: <31lfut$qln@hobbes.cc.uga.edu>

In article <ANDREW.94Aug2121620@neptune.qmw.ac.uk>,
Andrew Smallbone  <A.Smallbone@qmw.ac.uk> wrote:
>
>Has anyone experienced using PVM with a fire wall? specifically:
>
>We are using pvm groups and a control process that marshals processing
>between a number of clients and server processes on different
>machines.
>
>The question is: 
>Will this work if the machine running the control process talks to the
>clients through one network and the server processes through another
>(i.e. two ethernet boards) Will this confuse PVM?  Will it try to use
>the default (le0) network for all communications?
>
>If any one's done this or tried something similar I'd appreciate a mail
>saying it works or doesn't.
>

We (the computer center at the University of Georgia) had a small PVM
cluster set up with two ethernet cards, one for PVM traffic and one
for communication with the rest of the world.  The secret in setting this
up seems to be to change the hostname of the machines to be something new,
and assign IP addresses for the second cards to these new names.  That
really was all the configuration we needed.  You could still get to these
machines by giving the original IP address (or the original hostname, since
we kept the original name on the campus nameserver) and PVM, which uses
'hostname' to determine the machine name when starting up the pvmd, sees
a different name (the one assigned to the second card) and automatically
uses the second interface for its communication.  It seemed to work well,
until we dismantled the PVM-cluster, that is!

amf

***************************************************************************
Alan M. Ferrenberg (amf@dcs.uga.edu)
Asst. Research Scientist
University Computing and Networking Services
The University of Georgia

"There are three kinds of people in the world:  Those who know how to count,
and those who don't."
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