I have the following configuration, perhaps not too atypical:

-----------------------------------------
|Linux cluster nodes in private network |
|192.168.0.2 - 192.168.0.20             |
----------------------------------------- 
              |
              |
------------------------------------------------------------------
|master node, does IP masquerading for the cluster nodes, 2 NICs: |
|   eth1 = 192.168.0.1                                            |
|   eth0 = 133.18.7.20                                            |
------------------------------------------------------------------
              |
              |
-----------------------------------------
|webserver of our institute, 133.18.7.35 |
-----------------------------------------


It took me a while to find out a working configuration including 
the master node and the cluster nodes and using the central web server. 
My problem is that I do not know how to multicast between 
the private and the 133.18.7.* network.
I played around with mrouted, but  without success. 
Then I came up with a solution where multicasting outside the private network
ist not necessary: 

- install the web client on the web server, change "localhost" in
  ganglia-rrd.pl and ganglia.php to the master node's name.
- start gmond on the cluster nodes
- start gmond on the master node with:
    gmond -s 133.18.7.35 -i eth1


It is fine, it works (see
http://www.physik.uni-leipzig.de/Computer/ganglia/index.php), but some
problems remain:

 -  gmetric does not work on the  master node since it has no -i option.  
 -  How can I add clients from the  133.18.7.* network? 

Many thanks for a fine piece of software!

Best wishes,
Meik

-- 
Meik Hellmund
Institut fuer Theoretische Physik, Uni Leipzig
e-mail:[EMAIL PROTECTED]
http://www.physik.uni-leipzig.de/~hellmund

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