Says i don't have enough MTU - Video Game Consoles & Games

To change the MTU rate on your router follow the steps below:
Open your browser, enter the IP address of your router (192.168.0.1) and click OK.
Enter your username (admin) and password (blank by default).
Click OK to enter the web configuration page for the device.
Click on Setup and then click Manual Configure.
To change the MTU enter the number in the MTU field and click Save Settings.
If changing the MTU does not resolve the problem, continue changing the MTU in increments of ten.

1500 is the default MTU for Dynamic (DHCP) Cable (p. 20 in user manual).
1492 is the default MTU for PPPoE (Point to Point Protocol over Ethernet) DSL (p. 22 in user manual).
Other MTU settings are listed in the manual, simply do a search for "MTU".

Note: AOL DSL+ users must use MTU of 1400.

To find the proper MTU Size, you'll have to do a special ping of the destination you're trying to go to. A destination could
be another computer, or a URL (p. 86 in user manual).

Here is the PDF link to the User Manual:
http://www.dlink.com/-/media/Consumer_Products/DGL/DGL%204500/Manual/DGL%204500_Manual_EN_US.pdf

Don't change it. Microsoft is having issues...almost everyone in the US is getting that same message...

Go to the following link I will provide and your problems will be solved.
http://support.microsoft.com/kb/826159

An MTU is the largest physical packet size, measure in Bytes that a network is capable of transmitting.. If messages are larger than the MTU they are divided into smaller packets before they can be sent. All networks have different MTU's which the owner of the network set at what they want to set it at. 576 is a very common MTU if you connect through PPP. 1500 is the most common MTU for Ethernet connections. The Xbox Live system requires your network to have a certain Maximum Transmission Unit (MTU). MTU values are important to the performance of online games. If this test fails, you can adjust the MTU setting on your network router or equivalent device to resolve the problem. Xbox live requires the network you use to have a maximum MTU. This is key to online gamesing. If the MTU fails then you have to adjust the router you are using. If you cannot access the router to adjust the MTU the you will not be able to play online games.

Maximum transmission unit is 1500, but for the Xbox 360 it "must" be set within the range 1364 - 1492
Since there's no MTU settings for the TG782T. your only choice is to replace it with routers like Linksys, Belkin, Netgear.

The MTU or maximum transfer unit is configurable at the
modem that is bringing the internet service, in your case the Thomson tg782t modem, do not attempt to change the registry

xbox maintenance is today

What router is it?

I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309

You will have to set the MTU to 1500, that speed is not enough, if you are getting only 416Kbps downstream, then it's not right, either the router is at fault or your isp, understandably you are on 8mbits but you need to do a line speed check at BT web site and see what you should be getting in theory, as you may be far away from the exchange. The MTU of 1500 may not up it to what is should be, i think you need to check your line filters and get a line check done as 416 mbps is unacceptable.

MTU, Partial Loss of Internet Connection, and Performance MTU (Maximum Transmission Unit) is the largest packet a network device transmits. The best MTU setting for NETGEAR equipment is often just the default value. MTU is sometimes presented as something that can be easily changed to improve performance, but in practice this may cause problems. Leave MTU unchanged unless one of these situations applies: 1. You have problems connecting to your ISP or other Internet service, and their technical support (or NETGEAR's) recommends changing MTU. For example, these services may require an MTU change: * Yahoo email * MSN * AOL's DSL service 2. You use VPN, and have severe performance problems. 3. You used a program to "optimize" MTU for performance reasons, and now you have connectivity or performance problems. * An easy solution to most problems is to change MTU to 1400. * If you are willing to experiment, gradually reduce MTU as described in "Details of MTU", below. How to Change a Computer's MTU Size Note: If you change MTU on one computer, it is likely you will want to change it on your other computers, switches, and routers, as well. Instructions for changing MTU on other NETGEAR devices is found in the Reference Manuals. The third party Dr. TCP software can be used to change the MTU setting. 1. Download it from this link, choosing the zip file or the exe file at the top of the page. 2. Run the utility. 3. In the Adapter Settings pull down, select the Ethernet driver and adapter used to connect with the network. 4. In the MTU box, type the MTU size you are trying. 5. Click in any other box, without changing the data there. 6. Click Save. 7. Click Exit. 8. Restart the computer. Details About MTU A packet sent to a device larger than its MTU is broken into pieces. Ideally, MTU would be set to the same ? large ? value on all your computers, routers and switches, as well as on all the parts of the Internet that you access. But you cannot control the MTU on the Internet, and in practice the optimum MTU size on your LAN is related to your hardware, software, wireless interference, etc. * Tweaking MTU size may work well in one situation, but cause performance and connection problems in others. * When network devices with different MTU settings communicate, packets are fragmented to accommodate the one with the smallest MTU. * Windows XP sets MTU automatically, that is, it optimizes computer MTU for you. This Microsoft article explains resolving lack of connection to a broadband ISP using Windows XP: http://www.microsoft.com/windowsxp/using/networking/learnmore/ppoe.mspx * Once a network device fragments a packet, the data stays fragmented until arriving at the destination computer. Setting MTU size is a process of trial-and-error: start with the maximum value of 1500, then reduce the size until the problem goes away. Using one of these values is likely to solve problems caused by MTU size: * 1500. The largest Ethernet packet size; it is also the default value. This is the typical setting for non-PPPoE, non-VPN connections. The default value for NETGEAR routers, adapters and switches. * 1492. The size PPPoE prefers. * 1472. Maximum size to use for pinging. (Bigger packets are fragmented.) * 1468. The size DHCP prefers. * 1460. Usable by AOL if you don't have large email attachments, etc. * 1430. The size VPN and PPTP prefer. * 1400. Maximum size for AOL DSL. * 576. Typical value to connect to dial-up ISPs.