Two JGoup Server can't communicate each other with multicast

precondtion

we have two server Ip1 and Ip2 as a cluster , we used JGOUP as the sync cache channel. these days we find it not workable as it not sync data with

config:
to enable multi-machine synchronization, set the following to true

we are multicasting on 235.11.17.19 port 32765. For information about
<jgroupsInit>
<![CDATA[
UDP(mcast_addr=239.190.1.1;mcast_port=32986;discard_incompatible_packets=true;enable_diagnostics=false;
bind_addr=ip1;
max_bundle_size=60000;max_bundle_timeout=30;ip_ttl=32;enable_bundling=true;
use_concurrent_stack=true;thread_pool.enabled=true;thread_pool.min_threads=1;
thread_pool.max_threads=25;thread_pool.keep_alive_time=5000;
thread_pool.queue_enabled=false;thread_pool.queue_max_size=100;
thread_pool.rejection_policy=Run;oob_thread_pool.enabled=true;oob_thread_pool.min_threads=1;
oob_thread_pool.max_threads=8;oob_thread_pool.keep_alive_time=5000;oob_thread_pool.queue_enabled=false;
oob_thread_pool.queue_max_size=100;oob_thread_pool.rejection_policy=Run):
PING(timeout=2000;num_initial_members=3):
MERGE2(max_interval=30000;min_interval=10000):
FD_SOCK:FD(timeout=10000;max_tries=5;shun=true):
VERIFY_SUSPECT(timeout=1500):
pbcast.NAKACK(use_mcast_xmit=false;gc_lag=0;retransmit_timeout=300,600,1200,2400,4800;discard_delivered_msgs=true):
UNICAST(timeout=300,600,1200,2400,3600):
pbcast.STABLE(stability_delay=1000;desired_avg_gossip=50000;max_bytes=400000):
pbcast.GMS(print_local_addr=true;join_timeout=3000;shun=false;view_bundling=true):
FC(max_credits=20000000;min_threshold=0.10):
FRAG2(frag_size=60000):pbcast.STATE_TRANSFER
]]>
</jgroupsInit>

another server same config

<jgroupsInit>
<![CDATA[
UDP(mcast_addr=239.190.1.1;mcast_port=32986;discard_incompatible_packets=true;enable_diagnostics=false;
bind_addr=ip2;
max_bundle_size=60000;max_bundle_timeout=30;ip_ttl=32;enable_bundling=true;
use_concurrent_stack=true;thread_pool.enabled=true;thread_pool.min_threads=1;
thread_pool.max_threads=25;thread_pool.keep_alive_time=5000;
thread_pool.queue_enabled=false;thread_pool.queue_max_size=100;
thread_pool.rejection_policy=Run;oob_thread_pool.enabled=true;oob_thread_pool.min_threads=1;
oob_thread_pool.max_threads=8;oob_thread_pool.keep_alive_time=5000;oob_thread_pool.queue_enabled=false;
oob_thread_pool.queue_max_size=100;oob_thread_pool.rejection_policy=Run):
PING(timeout=2000;num_initial_members=3):
MERGE2(max_interval=30000;min_interval=10000):
FD_SOCK:FD(timeout=10000;max_tries=5;shun=true):
VERIFY_SUSPECT(timeout=1500):
pbcast.NAKACK(use_mcast_xmit=false;gc_lag=0;retransmit_timeout=300,600,1200,2400,4800;discard_delivered_msgs=true):
UNICAST(timeout=300,600,1200,2400,3600):
pbcast.STABLE(stability_delay=1000;desired_avg_gossip=50000;max_bytes=400000):
pbcast.GMS(print_local_addr=true;join_timeout=3000;shun=false;view_bundling=true):
FC(max_credits=20000000;min_threshold=0.10):
FRAG2(frag_size=60000):pbcast.STATE_TRANSFER
]]>
</jgroupsInit>

and we use the test programe test find no message receive at ip2
run at ip1 java -cp jgroups-all-2.6.12.jar org.jgroups.tests.McastSenderTest -mcast_addr 239.190.1.1 -port 32986

run at ip2 java -cp jgroups-all-2.6.12.jar org.jgroups.tests.McastReceiverTest -mcast_addr 239.190.1.1 -port 32986

we check two ips at the same network segment
at when we use the ping from ip1 to ip2, we can get the package with tcpdump