Internet isn't working on linux Karmic Koala

The brand of router is moot, routers obey ISO standards so it doesn't matter. Just like a webserver runing Linux will be accessed and behave the same as one using Windows.

With the connection established can you run:

sudo lshw -C network

and give the output, thanks

Ok thanks for the quick answer...

Here's the info requested:

wyverndany@wyverndany-laptop:~$ sudo lshw -C network
  *-network
       description: Wireless interface
       product: Realtek Semiconductor Co., Ltd.
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:0a:00.0
       logical name: wlan0
       version: 10
       serial: 00:26:b6:c3:b5:75
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=rtl819xSE driverversion=V 1.1 firmware=49 ip=192.168.0.123 latency=0 link=yes multicast=yes wireless=802.11bgn
       resources: irq:16 ioport:4000(size=256) memory:f0600000-f0603fff
  *-network
       description: Ethernet interface
       product: Attansic Technology Corp.
       vendor: Attansic Technology Corp.
       physical id: 0
       bus info: pci@0000:0b:00.0
       logical name: eth0
       version: c0
       serial: 00:26:9e:cb:c4:35
       capacity: 1GB/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress vpd bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=atl1c driverversion=1.0.0.1-NAPI firmware=N/A latency=0 link=no multicast=yes port=twisted pair
       resources: irq:35 memory:f0400000-f043ffff ioport:5000(size=128)

Anything else just let me know
thanks

New info...

I have been trying to work this problem at the extent of my knowledge, and today I got the connection to work. Well at least at some level.
I tried opening a webpage and it didn't work as usual, but then I tried to open another one and it worked. I was surprised and opened the update manager, clicked update and the update began and finished successfully.
The I downloaded amarok player without a problem.

But when I tried to open a webpage it didn't work...
Can anyone tell me what's happening?
When I use my windows partition the wireless connection works perfectly, and I have tried in linux other wireless networks and all of them work. Just this network has this problem.

Any ideas? tips? what ever ....
Thanks

If you run:

gksudo gedit /etc/resolv.conf

and add these 2 lines:

nameserver 8.8.8.8
nameserver 8.8.4.4

Then save the new file, close gedit then restart your browser, does web browsing work ok?

Hello:

I did what you said and the web browsing was fixed.
Thanks but if I restart the system i have to do everything again.
Is there a way to have it fixed every time ?

Then if I work on it for a while the connection falls again ...
It works for about 7 minutes or so...

Thanks actionparsnip, that solved my question.