From: bjoern.d.rasmussen@gmail.com   
      
   Hi   
      
   I'm currently working with an IGMP v2 switch which sends out a membership   
   query every two minutes. If no membership report has been issued to a group   
   within about 2-3 minutes the switch closes the group. This is all fine and   
   seems to correspond to RFC    
   2236.   
      
   If I create a Linux socket and set the socket-option IP_ADD_MEMBERSHIP to   
   report membership of 239.1.1.1 then I receive data from that multicast group   
   for about 2-3 minutes and then the IGMP switch closes the group because no one   
   has reported membership    
   of 239.1.1.1 since the last membership query.   
      
   Isn't a socket which is member of a multicast group supposed to report to IGMP   
   membership queries? When I look in Wirehark I can see that it doesn't. So how   
   do I ensure the IGMP switch doesn't close the multicast group until I   
   explicitly ask to leave the    
   group?   
      
   Kind regards   
      
   Bjoern   
      
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