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Tomcat in memory session replication - multicast problem

 
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Hi,
I have a fedora 11 server built with multicast (as can bee seen form ifconfig eth0)
Since my cluster nodes are not discovering each other, I tried the following command:
$ route add -net 224.0.0.0 netmask 240.0.0.0 dev eth0

and then checked with route -n, the entry has been added.
Still I cannot ping 224.0.0.1 (it does not return)

I get the message saying :

"skipping state transfer. No members active in cluster group."
I have used the basic one line as well as the advanced configuration mentioned in http://tomcat.apache.org/tomcat-6.0-doc/cluster-howto.html

What else can I do to solve this problem?
 
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