How can I share an ADSL connection?

[Yang Yiqi <yyq public bta net cn>]

Happy New Year!

I came across a problem trying to share my ADSL connection with another 
computer:

My notebook computer is running RH 8.0.  I put in two PC card ethernet 
adapters and both working fine as eth0 and eth1.  I use one of the NICs 
(eth1) for ADSL PPPoE connection.

If I do not activate neither eth0 nor eth1, the internet connection works 
fine.  But I can no longer browse to any webpage if I activate either eth0 or 
eth1, although I can still ping to any active putlic address from PPP0, which 
means the connection is still alive.

How can I set the machine to work with both eth0/eth1 and PPP0 activated?  How 
can I use this desktop as a gateway to make the internet connection availabe 
to another machine?  I can ping my notebook from the other machine after 
activating eth0.

Thanks!