online ps2 gaming problem..please help

ok like the title says i have a serious problem with getting online to play games such as socom 2 and combined assualt.I have dsl n its a really fast spped n when i try to connect it says i connect to the internet but then it says dnas error n wont authenticate dnas....i called sony n they said my internet connection is fine its something with my network....so i called my isp and they said i need a router so i went out n paid 134 bucks for a gaming router...it still says dnas error so that didnt work either so i was just wondering if anyone here knows how to fix this problem or anything at all...thanks in advance

just incase anyone comes trying to solve his problem, it's already been solved (in another thread)

yes its already been solved...thanks to everyone that helped