Connected to wireless network but can't access internet

[pierro504]

Hi, I've just installed Ubuntu on my desktop and configured the wireless connection. It says it is connected to my home network, but I can't access the internet, or rather, it does work in very brief intervals, then stops with the web page half painted. This issue impacts all apps that need internet access, from Firefox, to Install Drivers, Update Manager etc.
I've searched existing threads and tried ifconfig and sudo dhclient wlan0, no luck...
Any idea?
Thanks.

[inobe]

try restarting your router, just unplug it, and restart your box.

if it continues to happen, go into your connection properties and remove all save connections.

now locate the ssid and try again.

[lkraemer]

What Wfif Hardware are you using? What Drivers are installed?
Did you use ndiswrapper with Windows Drivers? How many different
methods did you attempt to get the Wifi functional?

Open a Terminal Window (Console) and post the output of:



lshw -C network
lsmod
ndiswrapper -l
cat /etc/modprobe.d/blacklist.conf
iwconfig



lk

[3rdalbum]

May be a case of something funny happening with your DNS settings; try changing your DNS directly to your ISP's DNS (rather than the router's own cache) or OpenDNS. I have instructions for this on my website: http://www.chrislees.info/ubuntu/opendns.shtml

[pierro504]

What Wfif Hardware are you using? What Drivers are installed?
Did you use ndiswrapper with Windows Drivers? How many different
methods did you attempt to get the Wifi functional?
Open a Terminal Window (Console) and post the output of:


lshw -C network
lsmod
ndiswrapper -l
cat /etc/modprobe.d/blacklist.conf
iwconfig

lk

Is Wfif hardware the network adapter? How do I find out from Ubuntu?
From Windows, it shows as "USB Wireless 802.11 b/g Adaptor", and the driver is Ralink 3.1.7.0.

I tried to run the code above, but it says ndiswrapper is not installed, and when I try to install it, it fails due to lack of network access.

Can you clarify what you mean by the different methods for getting Wifi functional? I let Ubuntu detect available networks and selected it, I also tried to manually type it in... Any other way?

[pierro504]

May be a case of something funny happening with your DNS settings; try changing your DNS directly to your ISP's DNS (rather than the router's own cache) or OpenDNS. I have instructions for this on my website: http://www.chrislees.info/ubuntu/opendns.shtml

Thanks for the link. I tried it: found my ISP DNS addresses and put them in. The connection worked just long enough to get me to my home page, then stopped working.

[cmcanulty]

look under file in firefox and make sure work offline is not checked

[lkraemer]

pierro504,
The commands should have given us the necessary information about your
Hardware, along with information about what modules were installed, and
what was blacklisted. Nothing was mentioned about installing anything!

Typically when one posts for help....he/she tries to aid those trying
to assist by following instructions, since we can't see your display.

In your case it might be best to SEARCH the forum for Ralink 3.1.7.0, and
proceed from there.

lk

[pierro504]

Sorry, I thought you needed the output of ndiswrapper. Here's the output of the requested commands without ndiswrapper installed.

I could not find anything on Ralink 3.1.7.0 in the forum.

Thanks for everyone's help, I appreciate it.

[Huligennem]

look under file in firefox and make sure work offline is not checked
Am having a similar problem, more on that later.. But every time I open Firefox, it works offline. Why is that?

[lkraemer]

pierro504,
Your Wifi is connected to: 12524Titus2p4GHz as Managed, and should be working.

It is reported as:
"configuration: broadcast=yes driver=rt73usb driverversion=2.6.35-22-generic firmware=N/A ip=192.168.1.10 multicast=yes wireless=IEEE 802.11bg

wlan0 IEEE 802.11bg ESSID:"12524Titus2p4GHz"
Mode:Managed Frequency:2.412 GHz Access Point:
E0:91:F5:C9:A8:87"

So Open a Terminal Window (Console) and do:



ping -c 3 www.google.com


You should see something like:


[larry@localhost ~]$ ping -c 3 www.google.com
PING www.l.google.com (74.125.224.52) 56(84) bytes of data.
64 bytes from 74.125.224.52: icmp_req=1 ttl=56 time=61.3 ms
64 bytes from 74.125.224.52: icmp_req=2 ttl=56 time=61.5 ms
64 bytes from 74.125.224.52: icmp_req=3 ttl=56 time=62.7 ms

--- www.l.google.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2003ms
rtt min/avg/max/mdev = 61.317/61.856/62.738/0.690 ms
[larry@localhost ~]$


3rdalbum has a good link with information about DNS Servers......
Posting #4

If that doesn't work, try putting in the OpenDNS Servers which are:
208.67.220.220 & 208.67.222.222 (I'm on Fedora 14 & Debian 6.0 at the
moment and the NETWORKING location for the DNS Servers is located
slightly different on these Distro's. You should be able to locate the
location under SYSTEM -> PREFERENCES or under SYSTEM -> ADMINISTRATION)

Also, Open Firefox and Click on FILE, to Open the Pulldown Menu and
make sure the Tick Box for WORK OFFLINE is NOT Checked.

You may need to go somewhere you can get an Ethernet Connection, and
after connecting via Ethernet, do a System Update. This should get you
any updates that may fix your problem.

Here is what I have previously used to manually connect.

Manual Method:
If you know the routers essid and the correct <interface>,
shown by using iwconfig ie wlan0, ath0, etc.... replace that
as the <interface> below:



sudo ifconfig <interface> down
sudo dhclient -r <interface>
sudo iwconfig <interface> essid "youressidofrouter"
sudo iwconfig <interface> mode Managed
sudo ifconfig <interface> up
sudo dhclient <interface>
iwconfig

example......for Airlink and Wlan0
sudo iwconfig Wlan0 essid "Airlink"

But, your ESSID and MODE is already selected........assuming the ESSID
is correct and it is UP with a 54 Mb Rate at 13db Power and Link
Quality=34/70.



"Bit Rate=54 Mb/s Tx-Power=13 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:on
Link Quality=34/70 Signal level=-76 dBm"


What about setting your WPA or WEP to NONE and try an OPEN connection
just to verify it is working before you enable encryption?..........
Assuming the ESSID and the Encryption Key is Correct...........

lk

[corncob]

try restarting your router, just unplug it, and restart your box.

if it continues to happen, go into your connection properties and remove all save connections.

now locate the ssid and try again.

Forgive me if I missed something but nobody seems to have suggested restarting your modem along with your router. It sounds as if your router is working but maybe your modem isn't. Do you have other computers on the network that are doing alright? What if you plug the computer directly into the router via ethernet cable?

[pierro504]

Thanks for suggesting. I did try the modem+router restart. I have several computers working fine on wireless, and even this one is working fine on wireless under Windows (but with other issues).
I have it wired directly into the router via ethernet right now, that's working fine. I'm doing system updates and trying all the things lk suggested in #11. Will report back. Thanks!

[pierro504]

Some progress, but the issue does not seem completely resolved yet:

I connected to the router via ethernet, which worked fine. I was then able to do a full system update and install all security and recommended updates. The connection then worked fine for a while, both on wired and wireless. I thought it was solved but started to have some intermittent connections again. It does not seem as systematic as before, which makes it harder to isolate. I'll play with it for a while and try and report more precise info.

In the mean time, here's the result of a few pings on Google:



abraracourcix@ubuntu:~$ ping -c 3 www.google.com
PING www.l.google.com (74.125.224.18) 56(84) bytes of data.
64 bytes from 74.125.224.18: icmp_req=1 ttl=55 time=21.9 ms
64 bytes from 74.125.224.18: icmp_req=2 ttl=55 time=19.1 ms
64 bytes from 74.125.224.18: icmp_req=3 ttl=55 time=25.0 ms

--- www.l.google.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 20645ms
rtt min/avg/max/mdev = 19.161/22.060/25.021/2.395 ms
abraracourcix@ubuntu:~$ ping -c 3 www.google.com
PING www.l.google.com (74.125.224.49) 56(84) bytes of data.
64 bytes from 74.125.224.49: icmp_req=1 ttl=55 time=20.9 ms
64 bytes from 74.125.224.49: icmp_req=2 ttl=55 time=72.0 ms

--- www.l.google.com ping statistics ---
3 packets transmitted, 2 received, 33% packet loss, time 16389ms
rtt min/avg/max/mdev = 20.915/46.491/72.068/25.577 ms

abraracourcix@ubuntu:~$ ping -c 3 www.google.com
ping: unknown host www.google.com

abraracourcix@ubuntu:~$ ping -c 3 www.google.com
ping: unknown host www.google.com

abraracourcix@ubuntu:~$ ping -c 3 www.google.com
PING www.l.google.com (74.125.224.48) 56(84) bytes of data.

--- www.l.google.com ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 2000ms