How to set the MTU size under Windows 7 ?

To manually set your Windows 7 MTU size, open command prompt as administrator and do the following:

1. Type: netsh int ipv4 show subinterface (this will show a list of network adapter names, and their current MTU values)

2. Type: netsh int ipv4 set subinterface "Local Area Connection" mtu=1480 store=persistent (where "Local Area Connection" is the name of the network adapter from the first command above, and 1480 is just a representation of the desired MTU size).

Network adapters are also listed under "Network Connections". For example, if the name of your network card under Network Connections is "Wireless Network Connection", and you'd like to set a MTU of 1500, you'd type:

netsh int ipv4 set subinterface "Wireless Network Connection" mtu=1500 store=persistent

3. Hit ENTER, reboot, and look at the output of "netsh int ipv4 show subinterface" again, the new MTU value that you set above should be retained.

Notes:
The "network interface name" is viewable under "Network Conenctions"
A list of "network interface names" and their current MTU values is also available by typing the following in command prompt: netsh interface ipv4 show subinterface