I am using the 250G Xbox. I have run the xbox live connection test multiple time and the final connection always fails. This is due to an insufficent MTU setting. However sense I live on campus and use the campus internet, I have no way to change these settings. I have tried connecting both wirelessly and hard wired with an ethernet cable. Is there any way to get around this?
The only way I have been able to get Live to work is if I make a network bridge from my laptop via the ehternet cable. This allows me to sign into Live on the dashboard, join a party, but as soon as I go to play multiplayer it disconnects and I am forced to re-run the network test to be able to sign in. These random disconnects also occur if just on the dashboard.
As a side note, and I know this is the Xbox forum, but as comparison both my laptop and my PS3 face no issues connecting and running the internet/multiplayer.