Not u or aything.
I and alot of other peps where talknig to a guy, asked us the sam question: "Why doesnt it go?" He had forgot to click the "Internet" button when he joined the "Multiplayer", instead he clicked the "LAN" button and thus not being able to get any info from the net.
Dont touch the DMZ... What router u got? u should go to a Virtual IP or UDP ports or something like that.. There u should be able to tell what ports u want to open, example 80 (Http), 21 (FTP).. 21000-28000 (Counter-Strike). And u should also be able to choose to what IP u would let those ports be opened for.. your IP then.. 192.168.x.x. (your internal IP, not your ISP-IP.)
First, update the Firmwae of the router to the newest. Most old versions got tons of bugs and things. (Mine wasnt able to config the Firewall..
)
I dont remeber what ports there are that u need to open for FL, but it says in the Read Me! file and u can ask it here for an answer.
SPQR