I honestly just suggest just giving the router a couple days... the same-thing happened to me, couldn't log in to router so I factory reset it(button on the back) and normally my dl speed is anywhere from 10-20mbps but after resetting it was only half that and I could only connect to matches in mw2 over 70ms(which is very odd for my connection).
It seemed to fix it's self in about a week, I'd also check the firmware.
[Edited by KiddCold, 4/4/2010 6:45:18 AM]
Hes talking about the NAT Type which as far as I know doesn't change by itself. My router is set just like his and I am going to change it so that I can find games faster.
Ok..
Remember your not always going to get top speeds all the time from sources, for example like Steam, if the network is congested it will result in slower speeds and higher ping times to networks.
But yes DO NOT go DMZ on your PC, that is seriously bad. Even though you have a specific address arranged via the Router, someone can access the router find your settings easily, find out what local IP addy you were assigned and connect via that.
With Steam you have to Port Forward ports to be used, Steam's help will tell you which ports and which are TCP and UDP protocols.
Thanks for the reply.
Ok I did notice something different, the activity lights on the router (there's 3, one for each computer/connection) are not blinking as much as they once did, they're more constant now, sometimes even stops at green colour. Previously I had 30 ping in local servers, now 100/110 (don't know if I mentioned this before), I've disabled the DMZ, now the NAT Type is Strict.