Navigate the the location below in your registry and make the corresponding change.

Create the following DWORD values and set the value as shown below. 

DefaultTTL = "80" hex (or 128 decimal)
This specifies the default time to live (TTL) for TCP/IP packets. The default is 32. 

EnablePMTUBHDetect = "0"
This specifies whether the stack will attempt to detect Maximum Transmission Unit (MTU) routers that do not send back ICMP fragmentation-needed messages. The default is 0. 

EnablePMTUDiscovery = "1"
This specifies whether the TCP/IP stack will attempt to perform path MTU discovery as specified in RFC 1191. The default is 1. 

SackOpts = "1"
This enables support for selective acknowledgements as documented by Request for Comment (RFC) 2018. Default is 0. 

Tcp1323Opts = "3"
This controls RFC 1323 time stamps and window scaling options. Possible values are: "0" = disable RFC 1323 options, "1" = window scale enabled only, "2" = time stamps enabled only and "3" = both options enabled. 

TcpWindowSize = "5ae4c" hex (or 372300 decimal)
This specifies the receive window size advertised by the TCP/IP stack. 

GlobalMaxTcpWindowSize = "5ae4c" hex (or 372300 decimal)
This specifies the system maximum receive window size advertised by the TCP/IP stack. 

Restart Windows. 

Key:[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters]
Data Type: REG_DWORD

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