I have two JBoss 3.2.5 under Redhat Enterprise Server R3 (Kernel 2.4.21) 
running in cluster mode (two machines in the same subnetwork 192.168.124.xxx).
All works fine unless I activate Multipathing on both machines. It looks like 
that the UDP communication fails, because both JBoss started without any errors 
but the instances doesn't see each other. If I deactivate the MP all works fine 
again. 
The config looks like this:

anonymous wrote :  <!-- The JGroups protocol configuration -->
  |     
  |       
  |         <!-- UDP: if you have a multihomed machine,
  |              set the bind_addr attribute to the appropriate NIC IP address 
-->
  |         <!-- UDP: On Windows machines, because of the media sense feature
  |              being broken with multicast (even after disabling media sense)
  |              set the loopback attribute to true -->
  |         <UDP mcast_addr="228.1.2.3" mcast_port="35566"
  |              ip_ttl="32" ip_mcast="true"
  |              mcast_send_buf_size="800000" mcast_recv_buf_size="150000"
  |              ucast_send_buf_size="800000" ucast_recv_buf_size="150000"
  |              loopback="false" />
  |         <PING timeout="2000" num_initial_members="3"
  |               up_thread="true" down_thread="true" />
  |         <MERGE2 min_interval="10000" max_interval="20000" />
  |         <FD shun="true" up_thread="true" down_thread="true"
  |             timeout="2500" max_tries="5" />
  |         <VERIFY_SUSPECT timeout="3000" num_msgs="3"
  |                         up_thread="true" down_thread="true" />
  |         <pbcast.NAKACK gc_lag="50" 
retransmit_timeout="300,600,1200,2400,4800"
  |                        max_xmit_size="8192"
  |                        up_thread="true" down_thread="true" />
  |         <UNICAST timeout="300,600,1200,2400,4800" window_size="100" 
min_threshold="10"
  |                  down_thread="true" />
  |         <pbcast.STABLE desired_avg_gossip="20000"
  |                        up_thread="true" down_thread="true" />
  |         <FRAG frag_size="8192"
  |               down_thread="true" up_thread="true" />
  |         <pbcast.GMS join_timeout="5000" join_retry_timeout="2000"
  |                     shun="true" print_local_addr="true" />
  |         <pbcast.STATE_TRANSFER up_thread="true" down_thread="true" />
  |       
  |     

Any ideas? I'm looking for a solution for the "old" 3.2.5 before switching to 
try a 3.2.7 or 4.0.x.

  

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