Related Links | Connection Tests: Maximum Transmission Unit (MTU)
This test confirms that your network has a sufficient Maximum Transmission Unit (MTU). MTU is a setting on your router or gateway that can affect network performance; the MTU diagnostic test will tell you if your router or gateway's MTU is too small. The MTU determines the largest datagram (a self-contained packet of information) that an IP interface can transmit. The larger the permissable datagram for your router or gateway, the faster the data throughput. Thus: the larger the datagram, the better the gaming. Xbox Live requires a minimum MTU setting of 1364, so your router or gateway's MTU must be greater than or equal to 1365. If it's less than 1365 you won't be able to connect to Xbox Live. If your console does not pass this test, you will not be able to sign in to Xbox Live. In this case, change the MTU setting on your router or gateway to a value of 1365 or greater (see the documentation that came with your device for details). Resources
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If you change your MTU setting and your console still fails this test, call 1-800-4MY-XBOX for help.