router ip? you mean the config web addy? are you sure your trying the right address? its different for different brands of routers/models.
your router probably isnt set up properly anyway if it seem to work but you dont have the internet.
whos your isp? was your last router one from your isp pre configured?
Also double check that you have been given an IP address which is valid e.g. 192.168.1.X and not the crappy 169.x.x.x addresses that microsoft automatically assigns if DHCP fails.
May seem like a dumb question but have you gone to the web config page at 192.168.2.1 by the sounds of it and set up the details for your internet connection.
Sorry if you've mentioned this but I'm struggling to see exactly what the problem is, it needs to be configure before you will get a net connection.
the router IP goes nowhere