Proof of concept - can this be done???

The customers scenario:

They have a pfS box with four interfaces (fxp0-3)
fxp0=WAN (static)
fxp1=LAN (192.168.1.0/24)
fxp2=DMZ (10.1.1.0/24)
fxp3=WLAN (192.168.2.0/24)

Everything works well and very reliably, but I
have two new networks (VLAN'd w/ Cisco switches)
that need access to the internet and DMZ based
servers through the pfS platform.  I can not add
another NIC (or dual NIC) to the pfS box as I am
out of PCI slots and there is no other option,
hardware wise, for this platform.

VLAN setup on customer network:

VLAN100=management net
VLAN101=LAN NET (192.168.1.0/24)
VLAN201=KIOSK NET (192.168.100.0/24)
VLAN301=LAB NET (192.168.200.0/24)

As of today these VLANs/networks (201 & 301) are
segmented/isolated and have their own DHCP servers
and have dead ended default gateways IPs of said
DHCP server .. another words they go nowhere when
requesting addresses other than the attached IP
space.  I do not have the option of changing the
address space of these networks as they are
managed by different business units and they are
adamant that they will not re-ip their networks. 
The LAN NET VLAN101 is the only one that has
exposure to the internet and they use pfS for
DHCP, DNS FWD & default gateway.

So here is my thinking ... I am thinking that I
can present the pfS box with a Cisco trunk that
will carry VLANs 101, 201 & 301 and feed it to the
fxp1 interface of the pfS box.  I can prune and do
all that I need to limit the exposure of all VLANs
to the pfS box no problem.  But the real question
is how to provide default gateway addresses and
DHCP service to these three dissimilarly IP'd
networks when there is really only one physical
NIC.  I can see in the interface section were to
create the tagging and assign NICs to a tagged
VLAN, but I am unclear as to assigning the IP of
the dissimilar networks to one NIC, is this the
"virtual IP address" section?  Assuming it is and
I assign VIPs to the fxp1 interface like this
(physical=192.168.1.1, VIP1=192.168.100.1,
VIP2=192.168.200.1) then how could I provide DHCP
and DNS service to all three networks from pfS? 
The managers want to remove the DHCP servers from
each of the two additional networks and rely on
pfS for DHCP and resolution to the net and DMZ.  [
thereby putting all the management of these nets
on me ... oh whoopee :-( ]

I may be reaching here and maybe this can not be
done with pfS.

Suggestions VERY welcomed !!!

--
David L. Strout
Engineering Systems Plus, LLC




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