adsl connection troubles with ubuntu

[John M. L. Moniz]

gudy zopfi wrote:

>Men, :) I'm quite new to ubuntu but got some linux
>(rh5.0) experience in the past,now quite a while ago..
>
>this is the situation :
>I have a home network with 4 pc's, connected to a 4
>port adsl router
>On my own pc(1 of the 4(the 3 others have win2k and
>xp)) I've just installed ubuntu(6.10)from the "life
>cd" on a brand new harddisk,well partioned and so on
>
>startup of ubuntu very smooth :) I can't see any
>trouble,applications running well and so on
>
>BUT internet acces..I can't get it right
>I get a message, "there are 25 updates available" so
>that means ubuntu has connected to a server somewhere,
>but the download fails always
>Also if I start firefox, I can't load any page
>(timed out every time)
>
>the point is I don't know where i must find the
>solution to this problem,bc the other pc's connection
>to internet are good
>
>is ubuntu(6.10) using differend protocols in compare
>with windows? how do I debug my system? where must I
>look and for what?
>I don't have any reference manual(as online help is
>also not working)and here in thailand you can't find
>books written in english...(i can't read thai...)
>(You have an idea how complex it becomes for me, but
>do my best is all i can ... :)  )
>
>
>
>Thank you so much for your help
>
>Gudy
>
Analysing network problems is one of those things that has to be done 
tiny step by tiny step. Some things to get started:
- it seems that eth0 is up, but check anyway with ifconfig.
- did you set up the network as DHCP or static IP?
- can you ping the other boxes & can they ping the linux box?
- try pinging an outside server (eg. www.google.com).
- Did you set up the network for ADSL or LAN networking? It should be 
LAN since you have a router.

Some of the above checks might give you a clue.

John