cannot connect to internet

[NoOp]

On 05/30/2009 08:01 AM, Uroš Vampelj wrote:
> Hello!
> 
> 
> You could say I'm new to linux- I have already used it a year ago, with no
> problems.. but let's say i have forgotten almost everything
> 
> my problem is that i cannot connect to internet using wired connections-
> this was also the original reason why i changed my sistem back to windows.
> The problem is, that I'm rigt now living in china- when i got here I was
> using Ubuntu 8.04- and i had a problem with ipv6- i could not disable it,
> and therefore i wasn;t able to use the internet connection. right now i'm
> using 9.04 and vista.
> I'm living in a university campus, so I have no iformation on their ISP,
> router, basically I dont have any other information except the assigend IP,
> DNS, gateway...

And those are?

> 
> I am conected, my hardware is working properly, the settings are correct,
> but it seems that my connection just wont work- it just connecting..... like
> it cannot even establish a connection with the server...

Can it do it from Windows?

> 
> ifconfig -a
> 
> eth0 Link encap:Ethernet HWaddr 00:1e:ec:c5:50:c2
> inet addr:210.30.189.247 Bcast:210.30.189.255 Mask:255.255.255.0
> inet6 addr: fe80::21e:ecff:fec5:50c2/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:42 errors:0 dropped:0 overruns:0 frame:0
> TX packets:69 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:4953 (4.9 KB) TX bytes:6704 (6.7 KB)
> Interrupt:18

You somehow have been provided with a WAN/Internet facing IP address:
210.30.189.247
That doesn't seem right unless you are running a server.

Your dns server shows no response:

$ ping 247.189.30.210
PING 247.189.30.210 (247.189.30.210) 56(84) bytes of data.

> 
> I've also tried su echo 0 > /proc/sys/net/ipv6/conf/all/disable_ipv6 and it
> didn't work

Why? 247.189.30.xxx doesn't appear to be an ipv6 network.

> 
> and the ping
> 
> uros at ubuntu:~$ ping www.youku.com
> ping: unknown host www.youku.com
> uros at ubuntu:~$ ping www.google.com
> ping: unknown host www.google.com

Try:

$ host www.youku.com
www.youku.com has address 211.151.50.100

$ ping 211.151.50.100
won't work as they are blocking regular pings. Instead, try:
$ ping 74.125.127.99
That's a google address.

> 
> the result for the university website- actually everytime you go online you
> first have to go to this address and enter your username,pass so that you
> are authenticated and so you can use the internet.. dont really know if this
> is important or not..

Yes it is. This means that you are accessing a proxy that is controlled
by the university (Liaoning Institute of Technology?).

> 
> uros at ubuntu:~$ ping 2.2.2.3
> PING 2.2.2.3 (2.2.2.3) 56(84) bytes of data.

That's a non-routeable reserved address.

I recommend that you contact the university IT folks and work with them
to figure out the issue.