Reading this post made my whole house smell like fish. Is there something fishy about your stated situation?
Let's see... It your router, but it's downstairs, in a bar. It's your router and you are not really sure what brand/model it is. It's your router but you don't know your own admin password. You don't want to actually umm... 'visit' your router to get its info. If you do actually get your hands on it, since it's a bar, a raging bar-fight is most likely going to break out if you mess with everyone's Internet (not good, all against one). You want to do it incognito from upstairs. Now what's wrong with this picture?
No, I'm not a jerk, I'm just the only one that's going to respond to this post... so far.
My advice: Get about 40 good, strong, big, tough friends to start a fight with everyone else that's there and you sneak over to the router and push the reset button real quick-like while nobody is looking. Now go back upstairs and enter the router through the default username and password and set the MAC filtering to "accept only" and plug in your MAC address. Problem solved. Now go back downstairs and buy the winners of the fight a drink, they earned it.