From: bjoern.d.rasmussen@gmail.com   
      
   Hm, removing this from /etc/sysctrl.conf on my OpenSuse 11.3 fixed the problem:   
      
   net.ipv4.conf.all.rp_filter = 1   
      
   -- Bjoern   
      
      
   On Monday, October 15, 2012 3:24:08 PM UTC+2, Bjoern wrote:   
   > 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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