Is there a way to disabled multicast / force unicast on Windows 7 SP1?

It is helpfull to give more information what is your primary goal, otherwise the answer may be ambiguous: If mean LLMNR, the here is the info http://blogs.technet.com/b/networking/archive/2008/04/01/how-to-benefit-from-link-local-multicast-name-resolution.aspx For multicast streaming http://en.kioskea.net/faq/15319-windows-media-player-disable-multicast-streaming Disabling by GPO http://www.vistax64.com/vista-networking-sharing/95027-ability-disable-llmnr.html General discussion and references... http://service.real.com/help/library/guides/helixuniversalserver/htmfiles/multicst.htm Regards Milos

Hi, Please perform following steps for testing. Click Start->regedit->HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\{GUID} This GUID indicates the relevant NIC, and it can be found with WireShark program. DhcpConnForceBroadcastFlag (0 or 1) 0 indicate unicast 1 indicate broadcast WireShark http://www.wireshark.org/ Hope that helps.