PPPoA Client

Hi,

I have:

- ADSL, PPPoA with Dynamic IP, VPI/VCI 8/35 and VCMUX encapsulation.
- Modem-Router Speed Stream 5660

I want:

- my box to have the public IP
- to route my LAN from/to the internet with my linux (lartc)

I have succeded with a Win XP client following the info in this web:
http://home.alltel.net/slashdot/speedstream-vpn01.html

How can i do it with a redhat 8 box? any ppoa clients? i configured once a
RDSI PPP connection, but never something like this. Is it posible?

Thanks

Martull