Not possible to bind two UDP sockets to the same port if one of them uses ANY local address

[rhornig]

If the first socket is bound to ANY/7777, and trying to bind to second to 192.168.1.1/7777, then the second call fails in UDP::findSocketByLocalAddress().

The socket API allows two applications to use the same port provided that they use different local addresses and that SO_REUSEADDR socket option is set to true on all sockets. Sockets bound to a specific address will receive unicast packets sent to that address, while the socket bound to ANY will receive the packets whose destination address does not match any other socket.

from: http://dev.omnetpp.org/bugs/view.php?id=653