The problem is, my Wireless network connection cannot connect. It's only worked if I plugged in the cable and then used the Internet for a while,
after being assured that I am connected, I will remove the cable and start using Wifi. This works just for a while, but when I restart I will have to do the same thing again.
After connected to the wired network, I try to bring my netbook away from the modem, I am still connected if I am nearby to my modem that located upstairs of my house. Then if I go downstairs, the connections is fading away but the wireless indicator still indicate 100% active.
Downstairs, I can't access the internet at all even though the indicator shows 100%. If I want to connect to the internet again, I have to go upstairs, put in the cable in again and again. This trouble's really exhausting me.
What is the problem?
You haven't indicated which brand your wifi adapter is. Have you check if there's a more uptodate driver for your wifi adapter? Does this also happen if you try it on another platform like windows?
I suppose your computer doesn't receive LAN paramenters (IP, DNS) via wifi. Try to Ping some IP outside you home network, for example Google public DNS 8.8.8.8. If it works with wifi after disconnecting from your ethernet cable, you probably need to configure your wifi connection settings manually ! Most likely you will need to provide DNS server information.
I had a very similar problem today using Ubuntu Maverick. I reinstalled my wi-fi driver (
bcmwl-modaliases) and now the issue is apparently fixed. Identify your wi-fi driver and try to reinstall it on the cable. Then reboot and try to use your wi-fi connection.If I were experiencing this type of problem with my own computer, I would start by trying to figure out whether the problem was with the DSL modem/router, or the computer. So the first thing I would do is reboot the modem/router to see if it is just a simple problem with that equipment.
Next, I would log in to the modem/router's web based configuration system (using the wired connection) to reset the wireless password just in case I had mistyped it. Then I would reset the wireless password on the computer to match the password entered into the router's configuration. Then, I'd unplug the ethernet cable and turn on the computers wireless and connect wirelessly to the router. Does it work?
Next, I would start to suspect that maybe it is a problem with the computer. Is there another wireless access point that you can try connecting too? Maybe at a library or coffee shop? If I could not connect successfully to another wireless access point, then I would really start to suspect that the wireless on the computer had some kind of problem. Maybe a driver that doesn't work properly? Maybe the wireless card is defective?
Finally, I would start to investigate what type of wireless card was installed in the computer. Is it well supported in Ubuntu and other Linux based systems? Have other people reported trouble with this type of wireless card? If so, I would look seriously at replacing the wireless card with one that is properly supported by Ubuntu, most are.
Some questions:
ifconfigin your initial post?If you do have obtained an IP address on the wireless adapter, try 2 things:
sudo ifconfig eth0 down) orsudo dhclient eth0 -r)Read through the community documentation here it should give you all the information needed to find the root cause of the problem.
If your still having problems you will need to provide some more diagnostic information to enable us to help you further - stating that it works fine on Win7 gives us very little information to go on.