Asus WL-500g losing speed

not sure if you are doing it right
your wireless router has 2 "sides" one is it's upload, it's wan network and that is where you should set DHCP - so that the router itself gets an ip from your LAN
other side is behind your wireless router and there DHCP should also be off. it would be best if you could put your router in bridged mode - just to extend your network over WIFI

Have you tried to reset the router? Most routers have a reset button in the back of the router (where the LAN ports are located) that you can hold in for ~30 seconds to reset the router to factory defaults which could also resolve the issue you're having as well. Although if you have a computer connected using a patch cable (CAT5) to a computer that is turned on and your not getting a link indicator light on your router then try another port to see if the led is visible then, if not try another patch cable or try connecting it to another machine.

Hi

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check the setting of the wireless

Yes you can get "into" your router via a broswser by typing in it's IP, usually 192.168.1.1 enter logon & password , if not set, usually admin, admin, (or blank). You should check your default settings though.

Then here you can manipulate ya router.

Usually the MAC is on a sticker somewhere on the router, but your ISP should also be able to detect it.

Whats the proble, please clarify....sodeep

It is possible that, since the firmware update, the standard username an password have changed. Try some other standard username/password combinations (see link).

When you're able to login, I would advise you to change username and password. If you leave both at the standard setting, anyone can access your router (and even change username and password).
Asus WL 500g Login Instructions

I've settle my problem. Set the correct VPI and VCI provided by ISP.

You need to contact your ISP if the internet connection is not there....