[AG-TECH] Bridge server with 2 interface cards

Wed Jan 12 06:04:59 CST 2005

Hi,

So far as I know, it is up to the user to choose which bridge server they
use, and the default (i.e first in the list) bridge server displayed does
not vary amongst clients.  I am unsure if there are plans to make this
change - I suppose randomizing the ordering in the list would do this.

Andrew :-)

============================================
Access Grid Support Centre,
RSS Group,
Manchester Computing,
Kilburn Building,
University of Manchester,
Oxford Road,
Manchester,
M13 9PL,
UK
Tel: +44(0)161-275 0685
Email: Andrew.Rowley at manchester.ac.uk

  _____  

From: Jinshung Liu [mailto:liu at tcrc.edu.tw] 
Sent: 12 January 2005 01:08
To: Andrew Rowley
Cc: ag-tech at mcs.anl.gov
Subject: Re: [AG-TECH] Bridge server with 2 interface cards

Hi, Andrew

Thanks for your comment , you are right about the design of bridge server.
We quit testing bridge server with 2 interface cards not only the way that
bridge server behaves, but the connection between venue server and bridge
server on 2 interface cards is awkard.

By the way, I would like to discuss another bridging design, and be glad to
share your opinion.

We have done tests on one venue serving by a couple of bridge servers, and
won't work as expected(we would like to see if the unicast connections could
be load shared). We built a couple of bridge servers and configured them to
serve a particular venue, so once you choose unicast service, a list of
bridge server would be  shown for selection, though some users selected the
different bridges, the users were directed to some particular  one.  

I know that many venues could be served by just one bridge server,  do you
think that AG team member have any intention to enchance load sharing
features as I mentioned above? 

Jinshung

 ----- Original Message ----- 

From: Andrew Rowley <mailto:Andrew.Rowley at manchester.ac.uk>  

To: 'Jinshung <mailto:jsliu at nchu.edu.tw>  Liu' 

Cc: ag-tech at mcs.anl.gov 

Sent: Wednesday, January 05, 2005 6:15 PM

Subject: RE: [AG-TECH] Bridge server with 2 interface cards

Hi,

Sorry, I misunderstood what was happening here.

What could be happening is that the bridge server is listening to multicast
on the network that does not have multicast enabled.  I am not sure how you
would go about doing this, but you need the unicast part of the bridge
server to listen on one network card and the multicast part to listen on the
other network card.  So far as I know, the current bridge server
(Quickbridge) only listens on one network card (which this is I am
uncertain).  I expect that if you use the multicast card by default, this
might work.  Otherwise, it will probably require a modification of the
source code of quickbridge to allow the choosing of a different network card
for the multicast and unicast sockets.

Andrew :-)

============================================
Access Grid Support Centre,
RSS Group,
Manchester Computing,
Kilburn Building,
University of Manchester,
Oxford Road,
Manchester,
M13 9PL,
UK
Tel: +44(0)161-275 0685
Email: Andrew.Rowley at manchester.ac.uk

  _____  

From: Jinshung Liu [mailto:jsliu at nchu.edu.tw] 
Sent: 23 December 2004 01:07
To: Andrew Rowley
Cc: ag-tech at mcs.anl.gov
Subject: Re: [AG-TECH] Bridge server with 2 interface cards

Andrew,

Thanks very much for your help, but I have another question, a reason that I
set up 2 cards.

We have 2 big networks, one is multicast enabled and the other is not, they
are not interconnected. But some users could access both networks, some
users can only access the network that is not multicast enabled.  So these 2
interface cards on Bridge server were designed to help  connectting  those 2
domain users.

Could you see any resolution ?

Jinshung 

----- Original Message ----- 

From: Andrew Rowley <mailto:Andrew.Rowley at manchester.ac.uk>  

To: 'Jinshung <mailto:liu at tcrc.edu.tw>  Liu' ; ag-tech at mcs.anl.gov 

Sent: Wednesday, December 22, 2004 6:27 PM

Subject: RE: [AG-TECH] Bridge server with 2 interface cards

Hi,

Often Multicast sockets are set up to "not loopback".  This means that any
traffic sent from the local computer is not received at the local computer
again.  This is typically true of bridges.

I do not think that you need to set up two separate cards to listen in to
multicast and unicast at the same time.  You can only set up one unicast
socket listening on a particular port, but you can usually set up any number
of multicast sockets listening on the same port as the unicast socket.

Hope this helps,

Andrew G D Rowley :-)

============================================
Access Grid Support Centre,
RSS Group,
Manchester Computing,
Kilburn Building,
University of Manchester,
Oxford Road,
Manchester,
M13 9PL,
UK
Tel: +44(0)161-275 0685
Email: Andrew.Rowley at manchester.ac.uk

  _____  

From: owner-ag-tech at mcs.anl.gov [mailto:owner-ag-tech at mcs.anl.gov] On Behalf
Of Jinshung Liu
Sent: 22 December 2004 03:18
To: ag-tech at mcs.anl.gov
Subject: [AG-TECH] Bridge server with 2 interface cards

Hi

We were trying to build a better AG connection topology, so we intalled 2
network interface cards, where one sits in multicast network domain and the
other in unicast network domain. 

But it didn't seem to work, the AG clients from multicast domain can't join
with the AG clients from unicast domain ( the clients using bridge server).

Could you give any suggestion ?

Jinshung Liu

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