For X-Box : Click on “Applications and Gaming” tab and then click on “Port Range Forwarding” subtab… 1) On the first line in Application box type in Xbox, in the start box type in 88 and End box type in 88, leave the protocol as both and under ip address type in 192.168.1.20 and check the enable box… 2) On the second line in Application box type in Xbox1, in the start box type in 3074 and End box type in 3074, leave the protocol as both and under ip address type in 192.168.1.20 and check the enable box and click on Save Settings… 3) Once you return to the set up page click on the Security tab and uncheck Block Anonymous Internet Requests and click on Save Settings… 4) Click on set-up and change the MTU Size to 1452 and click Save Settings… 5) Now assign the given ip address on your Xbox Go to the Network Settings of your X-Box, and then go to IP Address Settings and select manual ip/static ip and enter this ip address :- 192.168.1.20, subnet mask :- 255.255.255.0, default gateway/gateway/router :- 192.168.1.1…Save the Settings… 6) Also assign the dns addresses on the Xbox Primary dns :- 4.2.2.2…Secondary dns :- 192.168.1.1…Save the Settings… 7) Turn off your modem, router, and Xbox…Wait for a minute… 
Plug the modem power first, wait for another minute and plug the router power cable, wait another minute and turn the Xbox and test it…it will connect…