Should it be possible to start listening on a socket when the network 
adaptor is not connected, specifically a multicast address?  In my case 
this is a wireless adaptor out of range.  

I'm using UDP multicasting with, and unless the adaptor is 
connected I get an 'address not available' exception when listening.  A 
normal UDP socket listens OK.  

Also, if the network connection drops, and then reconnects later, no 
further multicasts are received.  It seems to socket must be closed each 
time the connection drops, and listen started again later.  

Is this all known multicasting behaviour?


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