Config Broadband Connection in registry:
locate the key folder:
keys to add or edit:
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.
Note: These optimized settings may not work with all ISP configurations, in which case the parameters should be returned to the default values.
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