Configuring local network

[franck routier <f.routier@wanadoo.fr>]

Hi,

I'm trying to configure a network between 2 local computers.

The configuration is :

1 PC running sid :
1 ethernet card to ADSL modem (eth0 10.0.0.1 pptp)
1 ethernet card to local network (eth1 10.0.0.2)

1 Powerbook running potato :
1 ethernet onboard card (eth0 10.0.0.3)

1 cable between them (no hub) (this is ok for only 2 computers, isn't it ?)

On the pc I did 'route add 10.0.0.3 dev eth1'.
I can ping 10.0.0.2 (eth1).
On the mac can ping 10.0.0.3.

But I can't ping each machine from the other one.

Did I miss something ?
Is there a way to know if the ethernet cards are well recognized ?
Can it be the cable ?

Thanx in advance,

Franck