In theory you should be able to "share" your internet connection. I use a Linksys WRT54GS wireless router and I have a Linksys Game adapter on my son's 360. He has not complained about lag or slow server times unless other intensive bandwidth is being used.
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No, a Xbox 360 Wireless Adapter is not required to access, and set up Xbox Live, but you will need an internet connection. If you are close enough to a modem or router, you can buy an Ethernet cord, and plug it in to both the modem/router, and firmly into your Xbox 360 console. You will either need the Xbox 360 Wireless Adapter, or the Ethernet cord. Ethernet cords are very cheaper, much cheaper than a Wireless Adapter, but the Wireless Adapters are much or easier to reason with. So choose wisely with money.
If your screen freezes when playing on Xbox LIVE, the problem may be related to your Internet connection. A weak wireless signal can cause poor Xbox LIVE performance. If you are using wireless connection: 1. Go to My Xbox and select System Setttings.2. Select Network Settings.3. Select Wired Connection or the name of your wireless network.4. Select Test Xbox LIVE Connection. If your wireless signal is only one or two bars, try improving your signal strength by following the suggestions below.
Move your router or gateway off the floor and away from walls and metal objects such as metal file cabinets).
Minimize obstructions along a straight-line path between your Xbox and your wireless router or gateway.
Shorten the distance between your console and your wireless router or gateway. Ideally, your network hardware should be near the center of your home.
Change the position of the antenna on your Xbox 360 Wireless Networking Adapter (external adapter only).
Turn off wireless devices. If your router uses the 2.4 GHz band, try turning off wireless devices, such as 2.4 GHz cordless telephones and Bluetooth devices.
Try changing your wireless channel. Wireless routers and gateways can broadcast on different channels and one channel might be clearer than another. See your hardware documentation for help changing wireless channels.
Add a wireless repeater to extend your wireless network range. You can boost your signal strength by placing a wireless repeater halfway between your router or gateway and your console.
Add an Xbox 360 Wireless N Networking Adapter.
Switch wireless signal bands. If you have a dual-band router and an external wireless adapter, try switching the router to a wireless protocol that transmits on the 5 GHz band (wireless protocol A or N). Please see your hardware documentation for help with changing the wireless protocol.
the xbox site has a good list of solutions: http://support.xbox.com/en-us/pages/xbox-360/troubleshoot/kb/error-your-network-does-not-have-sufficient-mtu-setting.aspx?kbid=979104
From that list, here's a couple simple things to try:
If it has worked before, try rebooting your home router (or unplug it from the outlet, wait 10-15 seconds, and plug back in).
If it has not worked before, and it is wireless, it may be a weak or wireless signal. Try moving any cordless phones away from the xbox or home router, or moving your router to a different location, even a couple feet away.
ok, so if you want to do it wirelessly you need to get the wireless network adapter for the 360. i got mine at target for about 100 bucks. You also will need a Xbox live Gold card if you are wanting to play with your friends. you can also get your subcription over the xbox by using a credit card. The setup is pretty simple, just follow the on screan instructions. I am assuming your dashboard uses the "blades". if so, go over to the marketplace section, and go to join xbox live. then it will guide you through the process.
Basically i know its a rip off but if u wanna use wireless with the xbox 360 u need to buy the official xbox 360 wireless router which is about £60.There is another way if u dont use wireless u can connect the xbox 360 to a router or the phone line then go to your windows firewall and set it up manually.Hope this can help you .Joe stevenson