You can use wireless router with DD-WRT as a wireless adapter for Xbox free

This tutorial will show you how to use a wireless router with the DD-WRT firmware installed as a wireless router for and Xbox or Xbox 360.
Hardware you will need:

• Wireless router with DD-WRT firmware installed (Client)
• Wireless router (Host)
• Xbox or Xbox 360
• PC
• Ethernet cord (optional)

Software you will need:

• Internet Explorer

You will have to configure the the Client router to be a wireless receiver which will allow it to receive the wireless signal from the Host and bridge it to the 4 Ethernet ports on the router. I chose to do this rather than purchase an Xbox wireless adapter because I could purchase a router (~$50) for around half the cost of the Xbox wireless adapter (~$100). This tutorial assumes you are using a Linksys WRT-54G/GL/GS router as the Host and an internet service provider (ISP) that provides a dynamic IP via DHCP.
Obtain Host router info:

1. Connect PC to Host router via Ethernet cord or wirelessly
2. Open Internet Explorer and navigate to 192.168.1.1 (this will open the Host router’s web interface)
   NOTE: You will be presented with a login prompt, use the credentials you set when configuring the router, if you cannot remember what they are, press the Reset button for 30 seconds, username and password will be reset to factory defaults (username: (blank), password: admin)
3. Select the Setup->Basic Setup tab and save the Host router’s Local IP, Subnet Mask, and Starting IP Address (usually 192.168.1.1, 255.255.255.0, 192.168.1.100)
4. Select the Wireless->Basic Wireless Settings tab and save the router’s SSID
5. Select the Wireless->Wireless Security tab and save the security info, if used
6. Select the Status->Router tab and save the DNS 1, and DNS 2 values

Configure Client router to receive wireless signal:

1. Connect PC to Client router via Ethernet cord or wirelessly
2. Open Internet Explorer and navigate to 192.168.1.1 (this will open the Host router’s web interface)
   NOTE: You will be presented with a login prompt, use the credentials you set when configuring the router, if you cannot remember what they are, press the Reset button for 30 seconds, username and password will be reset to factory defaults (username: root, password: admin)
3. Select the Wireless->Basic Settings tab
4. Change Wireless Mode to Client, change Wireless Network Name (SSID) to value saved from step 4 above, then press the Save Settings button
5. Select Wireless->Wireless Security tab
6. Enter wireless security settings from step 5 above and press the Save Settings button, if applicable
7. Select Setup->Basic Setup tab
8. Change Internet Connection Type.Connection Type to Static IP
9. Change Internet Connection Type.Internet IP Address to 192.168.1.2 (or any IP between Host’s Local IP (192.168.1.1) and Host’s Staring IP Address (usually 192.168.1.100))
10. Change Internet Connection Type.Subnet Mask to value from step 3 above (usually 255.255.255.0)
11. Change Internet Connection Type.Gateway to Host router’s Local IP from step 3 above (usually 192.168.1.1)
12. Change Internet Connection Type.Static DNS 1 to Host router’s Local IP from step 3 above (usually 192.168.1.1)
13. Change Internet Connection Type.Static DNS 2 to DNS 1 value from step 6 above
14. Change Internet Connection Type.Static DNS 3 to DNS 2 value from step 6 above
15. Change Router IP.Local IP Address to 192.169.2.2
16. Change Router IP.Subnet Mask to 255.255.255.0
17. Change Router IP.Gateway to 192.168.2.2
18. Change Router IP.Local DNS to Host router’s Local IP from step 3 above (usually 192.168.1.1)
19. Press the Save Settings button, you will get Settings are successful screen, then press the Close button
20. Go to Start->Run, then type cmd, and press Enter
21. Type ipconfig /release, then press Enter
22. Type ipconfig /renew, then press Enter
23. Open Internet Explorer and navigate to 192.168.2.2 to make sure the settings are saved
    NOTE: notice the new IP address for the Client router, it will be the value specified in step 15

Any device plugged into the Client router’s ports labeled 1-4 will now be able to connect to the internet. The Client router’s wireless signal will not be visible to any wireless adapter.
If you have a modded Xbox running Xbox Media Center (XBMC) connected to the Client router and wish to connect to a shared folder on a PC connected to the Host router, you may have to connect by entering the IP address of the PC sharing the folder rather than browsing to the PC.
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