These settings allow you to boost the speed of your broadband Internet connection when using a Cable Modem or DSL Router with Windows 2000 or Windows XP.
Open your registry and find the key below.
( to open registry type regedit on Run )
Create the following DWORD values, as most of these values will not already exist you will need to create them by clicking on ‘Edit -> New -> DWORD Value’ and then set the value as shown below.
DefaultTTL = “80″ hex (or 128 decimal)
Specifies the default time to live (TTL) for TCP/IP packets. The default is 32.
EnablePMTUBHDetect = “0″
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″
Specifies whether the TCP/IP stack will attempt to perform path MTU discovery as specified in RFC 1191. The default is 1.
GlobalMaxTcpWindowSize = “7FFF” hex (or 32767 decimal)
Specifies the system maximum receive window size advertised by the TCP/IP stack.
TcpMaxDupAcks = “2″
Determines the number of duplicate ACKs that must be received for the same sequence number of sent data before “fast retransmit” is triggered.
SackOpts = “1″
Enables support for selective acknowledgements as documented by Request for Comment (RFC) 2018. Default is 0.
Tcp1323Opts = “1″
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 = “7FFF” hex (or 32767 decimal)
Specifies the receive window size advertised by the TCP/IP stack. If you have a latent network you can try increasing the value to 93440, 186880, or 372300.
Exit your registry and restart Windows for the changes to take effect.
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