Internet Connection sharing

[cyclothunder]

> Hi!
>
> How do i share a internet connection ?
>  
> Case 1 - I've 2 pc's with ubuntu.Pc nº1 is connected to internet with 
> usb modem adsl and has a network card.Pc nº2 also has a network card.
>
> Case 2 - I've 2 pc's connected to a route wireless and there is no way 
> a can connect a 3rd pc wireless nor cable.On windows I'm able to share 
> a wireless network card allowing the wired network card to access 
> internet. How do i do this on ubuntu?
>
>
>
> thx :)