Maximum Transmission Unit (MTU)
One setting a router or gateway can influence is the Maximum Transmission Unit (MTU). The MTU determines the largest datagram than can be transmitted by an IP interface (without it needing to be broken down into smaller units). So what does MTU have to do with playing games? Read on…
What does MTU do on Xbox Live?
The MTU of your router or gateway must be greater than or equal to 1365. If it is less than 1365, you won’t be able to connect to Xbox Live.
How do I check my MTU size?
There are two ways. You can check your router or gateway manufacturer’s documentation for your device’s MTU setting. Or, you can let Xbox Live help you. With the latest update of the Xbox Dashboard, you can now determine if your MTU setting is too small for Xbox Live.
To see your MTU setting in the Xbox Dashboard
1. Select Xbox Live to sign in to Xbox Live from the Xbox Dashboard.
2. From the Xbox Dashboard, select MAIN MENU.
3. From the MAIN MENU, select SETTINGS.
4. From the SETTINGS screen, select NETWORK SETTINGS.
5. From the NETWORK SETTINGS screen, select CONNECT.
6. The Connect Status screen will automatically begin testing your network connection. When the test is complete, you will see 4 green balls on your screen.
7. When the network test is complete, press the Y button on your controller. A drop-down diagnostic screen will appear containing W, X, Y and Z diagnostic codes.
8. With the diagnostic screen visible, select OK to see additional information.
9. Find MT: x, where x is your MTU test result of either 0 or 1. 0 means your MTU size is not 1365 or greater and it won’t work with Xbox Live. 1 means your MTU size is 1365 or greater and you’re good to go for Xbox Live!
What if my MTU size is not compatible with XboxLive?
If the MT value is 0, you have a router or gateway that is incompatible with Xbox Live because of its MTU setting. You’ll need to change the MTU setting on your device. See your device documentation to accomplish this.
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