REGEDIT4

[HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\MSTCP]
"Tcp1323Opts"="1"
"SackOpts"="1"
"DefaultRcvWindow"="256960"
"DefaultTTL"="64"
"PMTUDiscovery"="1"
"PMTUBlackHoleDetect"="0"