Use BEFSR41 to join existing network infrastructure as DHCP server...help!

(Not sure if this is the right group to post this to, so I am sorry if
this belongs elsewhere. Please let me know!)

First off, what I am trying to do may not be possible...and I know
that. But, this is the equipment I have been given, so I want to make
sure that I am doing whatever I can get done with it.

I am at a main company office with a DHCP server here. I have a
remote office that has no DHCP server. They are on a different
network than our main office. Main is 192.168.8.x, 192.168.12.x,
192.168.10.x, and they are on 192.168.1.x.

They connect to our network with a Cisco PIX 501e firewall acting as a
gateway at 192.168.1.253.

Because we have no DHCP server at this remote location, we always have
had to physically set up a static address on every machine. Now we
are wanting to get away from that and put a DHCP server there to
autoconfigure any new systems that hook up.

Because cost is the absolute most important thing to our company I
purchased a Linksys BEFSR41 router from WalMart. I spent hours trying
to configure it to assign me a DHCP lease, which it did. After adding
a route for 192.168.0.0 to 192.168.1.253, I was able to reach my main
office network. BUT, Internet does not work at all. When I view the
routing table, it shows 0.0.0.0/0.0.0.0 heading out the WAN port...but
I am not able to use the WAN port for this kind of network connection,
and there seems to be no way for me to change this behavior. :(

When I looked at the DHCP lease information on my laptop when at the
remote location, it had assigned my default gateway to the router's
address. In the router, I set its default gateway to 192.168.1.253,
but again that was shown going to the WAN port. :(

The only solution I could reach is to manually set the default gateway
on the laptop to 192.168.1.253. This worked perfectly as far as me
being able to access everything I wanted...but totally defeats the
purpose of my DHCP server!

My question is, how can I make this work? How can I get this little
router to assign DHCP leases that correctly set the 'real' gateway for
our network, or if that's not possible, how can I set this router to
properly pass stuff to the 'real' gateway. :(

I have set the DNS entries for 192.168.1.253, then our main office DNS
server, then 4.2.2.1.

I realize this is a long explanation, but I really appreciate any
guidance you might have!! Thanks in advance!
.

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