setting up ltsp

[Antonello Facchetti]

hallo,
I'm installing edubuntu 6.06 in order to set up a thin-client lab.

my server has got eth0  that will go to the internet and eth1, a gigabit 
nic that will serve the thin clients.

the installation process asks to configure only one NIC, namely the 
"main" one.

which one should be considered the "main" nic: eth0 (to the exitranet) 
or eth1 (to the thin-clients) ?

what should I do in case I configured the wrong one?

TIA
Antonello