To manage remotely your Linksys WAG200G adsl modem and router then you have to notice the following things:
- Enable remote management from the administration of your linksys router (it’s located by default at http://192.168.1.1 and username and password is admin)
- Check if your ISP (internet service provider) is blocking any ports.
- Go to http://www.canyouseeme.org/ and see if port 8080 is open. (Change the port for more security)
If the port is open then you can visit your router with the following link https://your ip here:port
Firefox or Internet Explorer will not load the administration until you grand access of the certificate. Trust the certificate and Voila! A popup dialog will ask you for username and password.
Change username and password for security reasons.
Also if you want to access a server (Mail server, Remote management, File server, etc) you have to forward a port from ouside to the inside. You can do this by configuring the port forwarding options from the Applications&Gaming page.
Hope it helped!