a couple of days ago i turn on my 360 and it shows i am disconnected from xbox live. i run a test and it says my MTU settings are too low, needs to be at least 1354. never been an issue before and i didn't change any settings on my router or xbox prior to this error. i changed my MTU settings, tried a few different numbers between 1354 and 1460 (my isp's max). still won't connect. i removed the router from the equation and hooked up the 360 directly to the modem and i still get the same error. i called my ISP and they say everything is fine on their end. i've spent probably 6 hours now changing settings on my router and 360. i've gone through all the troubleshooting pages on the xbox live website and still can't get past the insufficient MTU error. any suggestions?