Setting The MTU
The Maximum Transmission Unit (MTU) is a value that defines the maximum size of each packet leaving your computer. You may need to lower this value on each computer behind WinRoute. To see if this is necessary you can perform a ping test as follows.
From a dos window type: ping -f -l 1472 yahoo.com
If you receive the message: Packet needs to be fragmented but DF set. Then you need to lower the MTU. Try the same test again using 1400 in place of 1472. If you get a message like: Reply from 216.115.108.243: bytes=1472 time=180ms TTL=246. Then 1400 is a sufficient size. Otherwise you’ll need to continue lowering the value until you get a reply.
Windows 2000/XP
HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/Tcpip/Parameters/Interfaces{interface}/MTU (DWORD Value)
NOTE: If the �MTU� value is not present by default you may need to add it as a dword value.
Set the value data (as decimal) to the packet size determined by the Fragmentation test
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