Most users never get splashed

hi folks,

I have a basic question, thanks for any help you can offer.  I'm hoping
someone can tell me what I need to do to get the system to work so that
everyone who connects gets a splash.

I have a Metrix Mark I connected to a NoCat gateway operating in Open mode.
The first user who connects through the Metrix board gets the splash screen
but all subsequent users never see the splash.  I have NAT running on the
Metrix board.  The NoCat logs on the gateway only show the first connection
and never show that anyone else has attempted to connect.  The connection
always shows the MAC of the eth0 port on the Soekris board.  I figure this
is probably because the NAT is altering the connection information so it all
looks the same.

When I disable NAT on the Metrix, the system won't make any connections at
all.  I'm thinking that I need to configure the addresses and gateways
differently, but nothing that I've tried, short of leaving the NAT running
works.

The system details are currently:

NoCatGateway:
device	IP			Connects to		Services	Equipment
eth0		192.168.91.2	Metrix eth0		NoCat		Intel inBusiness 10/100
eth1		192.168.2.100	Router				Intel inBusiness 10/100


Metrix Mark I:
device	IP			Connects to		Services	Equipment
eth0		192.168.91.1	Gateway eth0	NAT		Soekris 4526
wlan0		192.168.89.1	wireless users	DHCP		Prism 802.11b Mini PCI card

Router:
device	IP			Connects to		Services	Equipment
Lan		192.168.2.1		ISP			NAT		SMC Barricade 7004ABR

I'm not sure if this matters, but DHCP assigns the wireless users ip
addresses in the range of 192.168.89.10 through 192.168.89.250 and the
gateway given is 192.168.89.1, the ip address of the wlan0 card on the
Metrix Mark I. The wlan0 thinks its gateway is 192.168.91.1.

I'd appreciate any help you might be able to offer,

Thanks,

/Rob

916-799-3121