Change the MTU under Vista or Windows 7

First of all you are going to need to find the optimum mtu for your situation to do so follow these instructions.

ping www.google.com -f -l 1500 (lower case F and L not a 1)

you will receive something similar to this.

Pinging www.l.google.com [66.102.9.105] with 1500 bytes of data: Packet needs to be fragmented […]

How to find the optimum MTU

This is something i am always forgetting so here it is, the best way to find your optimal MTU setting is to use the ping command, open your command prompt and use the following command.

ping www.google.com -f -l 1500 (lower case F and L not a 1)

you will receive something similar to this.

[…]