Configuring the Linksys setting on 192.168.1.1?

Hey guys, i am soooooooo pissed off that whenever i want to play with my friends on GTA4 on Xbox360 and suddenly it said "Disconnected. returning to singleplayer." So i found out my NAT Type(on MW2) is Moderate, and i looked up the sites, they said my NAT Type has to be Open so that i wouldn't have another problem in the future. so i typed "192.168.1.1" in the bar and i typed admin as username and none for pword, but nothing! so i tried another way: User:____ and P: admin, nothing. Use: admin and P: admin, STILL NOTHING! And yes i tried resetting my router by pressing the reset on (30 sec). STILL NOTHING! i looked up Youtube, a lotta of people have that same problem as i do. i tried the .2 and .0 and .245 and .100 in the address bar, NOTHING! i was so PISSED OFF THAT I JUST WASTED 5 HOURS OF MY LIFE I WOULD NEVER BE ABLE TO GET THAT BACK!!! please guys, I NEED your help.