I had a perferctly fine connection of broadband internet. Win xp on laptop with KT connection.
I bought a couple of wireless device and to use those then bought a Buffalo Airstation wireless router.
I ran the wizard of the router and it was all fine. I could connect to the internet in my laptop and my samsung android phone.
One day suddenly it stopped working and started asking the user id and password of my ISP.
I had never give my username and password while connecting to my ISP coz it is all set up without that.
It works fine when I disconnect the router and use it directly in my laptop. Never asks me password.

Now, this is interesting- I can use skype, gtalk in my android machine and skype in ipad2 but cannot use internet in my laptop(connected to the router) or phone or ipad.
I know skype uses UDP and internet uses TCP.

Some website suggested it was the problem of DNS- dont know if that is true? But through my router I can ping buffalo/ google website using both domain name or IP.
The only problem I see is the connection between my router and my computer/ mobile.
Please help me resolve this problem.

Thanks in advance.