dhcp3-server question

[Ned Granic]

Hi all,

I've been coping with this freeking thing forever, and obviously I don't get it.
I simply want to configure the dhcp3-server so when I connect my other computer to my Linux box with a cross-over cable, the Debian box should issue an ip address through the dhcp to that computer.
But when I edit the dhcp3.config file, and restart the dhcp3-server, it fails to start.
The error listed in the /var/log/syslog file is:
line 32: subnet 192.168.1.1 netmask 255.255.255.0 - bad subnet/netmask combination.
the 192.168.1.1 is my router.
There is only one on-board network card on the box.
Do I need another network card as well for the local network, and how in that case should I configure the dhcp?
Which one, eth0, or eth1, should be the local, and which one the outer interface?
I tried to read the manual on the dhcp3-server, but damn, there is nothing I can understand there.

Many thanks in advance!
Ned