Setting Internet Access

Settings for Internet access with Microsoft TCP/IP stacks.

This information is provided for cases where connections across a Wide Area Network (WAN) including the Internet are not stable.  If you are only connecting locally or have no problems with connections across your network do not make these changes.

WFWG

Edit SYSTEM.INI

[MSTCP]
DefaultTTL=(Default is 32, set to 128)
PMTUBlackHoleDetect=(Default is 0, set to 1)
PMTUDiscovery=(Default is 1, set to 0)

Windows 95

Use REGEDIT to locate the following key:

[HKEY_LOCAL_MACHINE\
System\CurrentControlSet\Services\VxD\MSTCP]

Add these three items to the key:

“DefaultTTL”=”128”
“PMTUBlackHoleDetect “=hex:01
“PMTUDiscovery”=hex:00

DefaultTTL (string) (Default is 32, set to 128)
PMTUBlackHoleDetect (binary) (Default is 0, set to 1)
PMTUDiscovery (binary) (Default is 1, set to 0)

WIN NT

Use REGEDT32:

HKEY_LOCAL_MACHINE
SYSTEM\CurrentControlSet\Services\tcpip\parameters\DefaultTTL (Default is 32, set to 128)
EnablePMTUBHDetect (REG_DWORD) (default is 0, set to 1)
EnablePMTUDiscovery (REG_DWORD) (default is 1, set to 0)