JChannel ch=new JChannel(new SHARED_LOOPBACK(),
new SHARED_LOOPBACK_PING(),
new MERGE3().setValue("max_interval", 3000).setValue("min_interval", 1000),
new NAKACK2(),
new UNICAST3(),
new GMS().setValue("print_local_addr", false),
new FORWARD_TO_COORD(),
createRELAY2(site_name)).name(node_name);
if(receiver != null)
ch.setReceiver(receiver);
if(cluster_name != null)