public void sendPongMessage(JChannel channel, Address src, Address dest) throws Exception {
    channel.send(createPongMessage(src, dest));
  }
GMSPingPonger is used to detect whether a member exists by sending UDP Ping and Pong
messages. A member can send a Ping message to another member and receive a Pong message
in response. GMSPingPonger is largely used to detect whether a quorum of the cluster
is reachable.
geode-membership/src/main/java/org/apache/geode/distributed/internal/membership/gms/messenger/GMSPingPonger.java