Collecting Ethernet adresses necessary?

[Werner Fischer]

I'm new to FAI, but it seems very useful for me. I was not able to find
information on some of my questions (after reading the FAI Guide, using
Google and searching the mailing list archive), so here is my post:

I want to use FAI to install two different kinds of systems, "system1"
and "system2" (so I will use two different classes for that). I will
only do a first-time installation, the machines are afterwards not
connected to my network and out of my control (so I will also not need
the nice FAI features for re-installing a machine later on).

Question 1:
Chapter 3.5 "Collecting Ethernet addresses" in the FAI Guide describes
that it is necessary to collect the MAC addresses and assign hostnames
and IP addresses to them.
I don't care about the IP address during installation (the IP addresses
will be changed afterwards anyway). The hostname should always be the
same for a machine in a class (either "system1" or "system2"). Is there
a way to omit the step "Collecting MAC addresses"?

Question 2:
The hardware for machines for "system1" class and "system2" class is
exactly the same. If the faiserver has two network interfaces, is it
possible to use both network interfaces for FAI installation in a way
that machines, that are connected to eth0 on the faiserver will be in
class "system1" and machines, that are connected to eth1 on the
faiserver will be in class "system2"?
Any other ideas on how to differentiate two types of systems when the
hardware is the same and I do not want to rely on MAC/IP address based
mechanisms?

Thanks in advance for any ideas about that,
Werner Fischer