I've almost achieved what I need by using TcpDelegatingCacheLoaders. The configuration I have is: Cluster 1 has two nodes A and B replicating using UDP. Cluster 2 has two nodes C and D replicating using UDP. A, B, C, D all use unshared cacheloaders Clusters 1 and 2 cannot find each other Node A has a chained TcpDelegatingCacheLoader, delegating to a TcpCacheServer that wraps node D Node C has a chained TcpDelegatingCacheLoader, delegating to a TcpCacheServer that wraps node B Now what happens is that a single cache change is continually propagated in a loop, typically A->C->B->D->A, because A does not know that the update incoming from D originated from A (A and D are in separate clusters). I think I'm close to what I am trying to achieve; can anyone fill in the miss bits? Can the data packets be given UUIDs so that A can ignore packets that it created? Also, it looks like the true tag is ignored for the TcpDelegatingCacheLoader View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4020124#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...