[AG-TECH] Bridge server with 2 interface cards

[Jinshung Liu]

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 
  To: 'Jinshung 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 J

  ============================================
  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 

    To: 'Jinshung 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 J

    ============================================
    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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