Ubuntu Networking :: Connected To Wifi But Cannot Access Internet

Sep 5, 2010

I've been using my upstairs computer with no problems recently up until this evening, when I rebooted it did an automatic scan of my disks, so I left it to it's thing and when I came back ubuntu had successfully booted, and had seemingly successfully connected to my wireless network as usual.

I've been through the wireless troubleshooting guide, paying special attention to sections 4 and 6 but to no avail, while I'm apparently connected, and have been assigned an IP by my router I'm unable to access anything outside my computer, including the router itself. This happened before, however I solved it by reinstalling ubuntu, and I'd rather not do that again!

output of ifconfig
eth0 Link encap:Ethernet HWaddr 00:1c:25:38:8e:de
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
[Code]....

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Ubuntu Networking :: Wifi Connected But Cannot Access The Internet

Sep 20, 2010

I am facing very strange problem with my Dell with WiFi card (04:00.0 Network controller: Intel Corporation Wireless WiFi Link 5100) It seems I am connected to the WiFi but can not access internet I have to disable networking and re-enable it to access internet.

Network configuration

Quote:

-network
description: Wireless interface
product: Wireless WiFi Link 5100
vendor: Intel Corporation

[code]....

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Code:
$ uname -a
Linux valyria 2.6.31-14-generic-pae #48-Ubuntu SMP Fri Oct 16 15:22:42 UTC 2009 i686

[code]...

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Jun 5, 2011

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Jul 11, 2011

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Jul 12, 2010

Problem with this bizarre Wifi problem. I have searched and searched and cannot find a solutions. Unfortunately this affects 3 computers in my household. And as the resident amateur Linux tech support/Linux advocate, I will be held responsible if I don't figure out how to fix this quick. After some extensive playing around, this is the situation. I have this problem on Ubuntu 9.10, Mint 9 (based on Ubuntu 10.04) and PC Linux OS 2010.:

- About a week ago the wireless network I use stopped working. There was a major power failure on our block during this period. No idea if there was a connection. Since then, I have been able to connect, but I am no longer able to access the internet. I can ping my own IP and my router, but no website (niether by IP not URL).

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- I have found exactly the same problem on my wife's laptop running Ubuntu 9.10 and on a Live CD of PC Linux OS 2010
- I am still able to log into all other wireless networks without problems.

I am perplexed. Is it possible for a wireless network to prevent internet access to linux computers? And inadvertently? I tried disabling IPv6 (which wasn't being used anyhow), but this didn't make a difference. I also tried manually entering an IP address and other network details into the network settings.

[Code]....

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Mar 23, 2010

WiFi on this laptop worked fine for a few months then went out; after a reinstall of ubuntu (since 9.xx had come out since then anyway) the wireless still refused to even see networks, let alone connect to them; under Wireless Networks in the NM, I just see a greyed out 'disconnected'. This got me to thinking that it may have just been a hardware issue, but I find that hard to believe. Anyway, here's the pertinent information:

Started off with an lshw command just to see if a network adapter is even listed as being connected: `lshw`

Code:
id:
network:1
description: Wireless interface
product: PRO/Wireless 2200BG [Calexico2] Network Connection[code]....

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Here are the details:
Code:
Laptop : Lenovo U330
lshw -C network output:
*-network
description: Wireless interface
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vendor: Intel Corporation
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serial: 00:21:5d:0b:08:d6
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resources: irq:46 memory:e4500000-e4501fff

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I just installed Fedora 14 i386, and Fedora can see the wireless network just fine. I try to connect and nothing happens. It asks for the PSK constantly (yes, I promise I'm entering it correctly), even after I enter it correctly (I guarantee). I've searched around here a bit, but due to my limited knowledge in linux system I can't figure it out

1.
Code:
lsusb
Bus 002 Device 002: ID 1737:0071 Linksys WUSB600N Dual-Band Wireless-N USB Network Adapter

2.
Code:
iwconfig
lo no wireless extensions.
[Code]....

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Jul 7, 2010

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[Code]...

I've also installed hostapd, and attempted a few things in there. Long run I want to allow wifi users to access the net. But will probably need iptables etc but just want to pass this step. I've see a few howtos seem to use ath0. It's probably only a minor issues.

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Sep 7, 2010

I've recently salvaged a computer I found gathering dust in the basement and decided I'll have it running on Fedora (I have a summer studentship coming up that needs Linux use so I thought I'd best start learning!). Following a clean install, Fedora can see the wireless network just fine. I try to connect and nothing happens. Half of the time it will ask for the PSK (yes, I promise I'm entering it correctly) and the other half of the time it will just stop. When it does ask for the PSK I enter it (correctly) and it will ask me again... and again.

Quote:
uname -r

2.6.33.3-85.fc13.i686

Quote:
lspci
00:0b.0 Network controller: Broadcom Corporation BCM4318 [AirForce One 54g] 802.11g Wireless LAN Controller (rev 02)
[Code]....

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