On May 9, 2010, at 10:17 PM, Dan Letkeman wrote: > Am I missing something? Or does this just not work? Well, ttl=1 always wins, or doesn't, so to speak. AFAIK, ssdp mcast destined packets are ttl=1 on winders by default. Not authoritative in all cases, but this seems spot on: http://msdn.microsoft.com/en-us/library/aa381091%28VS.85%29.aspx -Tk