ramito123 wrotehere is the story
Xbox live works like for a coupe of days then stops working for another couple of days saying the MTU isn't sufficient i try changing it hundreds of time and after a while it works , i updated my router and everything but still i have to problem i have a W340G Tp link router.
I had the same thing.
At first it worked then it stopped working because of the MTU even though the MTU was sufficient, I had to go to Ogero and change my modem and now it works.