By default, a Wowza media server binds to the local network interface when joining a multicast stream. If you would like to force the Wowza media server to join using a particular network interface, edit [install-dir]/conf/VHost.xml and edit the RTP/Datagram/Incoming section like this (where [address-of-network-interface] is the local address of the network interface that you want the Wowza media server to use when joining the multicast stream):
<!-- <MulticastBindToAddress>true</MulticastBindToAddress> --> <!-- <MulticastInterfaceAddress>192.168.1.22</MulticastInterfaceAddress> -->
<Property> <Name>multicastInterfaceAddress</Name> <Value>[address-of-network-interface]</Value> </Property>
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