currently running Ubuntu 11.10. my wireless connection to our router has already been established but when i open Firefox, the page says server not found.please help me
I would suggest resetting your Router and your Modem (if you haven't done so already). In case you haven't I would suggest powering down your modem, router, and PC. Wait 30 seconds and power up your modem...wait 45 seconds to 1 minute and power up router...wait 45 seconds to 1 minute and then power up your PC.
I think this should fix it by resetting the IP connection. I know this works all the time with Windows.
Try this, go to terminal and try
If the ping to 220.127.116.11 is successful, then you have a DNS problem, and should try changing your DNS settings to use Google's DNS servers (18.104.22.168, 22.214.171.124)
If the ping fails, then you have no internet connection at all, and need to either configure the router or modem properly. Your best bet for configuring the modem would probably be to contact your ISP. Most routers are plug-n-play so that shouldn't need configuring, but if it does we can help you with that as well.
If you know how, try logging in to the router to check the status of the internet connection on the router. It's possible, though unlikely, that the internet is getting to the router but no further.
Edit: Also, though this probably goes without saying, check that you have the modem plugged into the correct port on the back of your router. There are usually 4 or more regular ports, and one 'uplink' port where the modem plugs in. If you plug it in to the wrong port, you will likely have network trouble.
try the following command in terminal
If it reply then your internet connection is ok, problem is in firefox. Maybe firefox is using proxy, to disable it Go to Edit>Preference>Advance>Network. select Settings for network and check no proxy.
If you can not ping that means something is wrong in routing. Check your router that is it provide service for specific(mac address filtering) machine? make sure your device mac address is in router
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1.ping www.google.com in terminal
2.if its work then do ifconfig and see which eth0 or eth1 or so.... connected
3.then do it ifup eth1 or eth2 or any other which is connected in the system.