Switches-Ensure that the switches are configured to forward multicast traffic. Consult your operating system/firewall documentation for details on allowing multicast traffic. If multicast is not functioning properly, consult with a network administrator or sysadmin to determine the cause and to correct the situation.įirewalls-If any of the computers running the multicast test employ firewalls, the firewall may be blocking the traffic. Use the following troubleshooting tips if bidirectional multicast communication is not established. This indicates that multicast is functioning properly between these servers using the default multicast address and port. In the example both Server A and Server B are issuing multicast packets and seeing their own and each other's packets. The following example demonstrates sample output for Server B: Tue Mar 17 16:11:: Received test packet 7 from self.

Tue Mar 17 16:11:: Received test packet 6 from self. Tue Mar 17 16:11:: Received test packet 5 from self. Tue Mar 17 16:11:: Received test packet 4 from self. Tue Mar 17 16:11:: Received test packet 3 from self.

Tue Mar 17 16:11:: Received test packet 2 from self. Tue Mar 17 16:11:: Received test packet 1 from self. The following example demonstrates sample output for Server A: Start the test on Server A and Server B by entering the following command into each's respective command window and pressing ENTER: By default, the test uses a TTL of 4, if more network hops are required to route packets between Server A and Server B, specify a higher TTL value. For this test use a nonzero TTL which allows the packets to leave their respective servers. Next, test multicast communications between Server A and Server B. Repeat the same test on Server B to assure that it too has the multicast enabled for it's port combination. Also, note that a TTL of 0 was specified to prevent the multicast packets from leaving Server A. If you do not see something similar to the above, then multicast is not working. Leave the test running for approximately 5 minutes to ensure there are no failures.

Send wlisten multicast