Two IP networks on one Ethernet

The situation is this: we have a home network with a gateway running 
Debian.  It has two Ethernet cards.  We have an IPIP tunnel configured 
so that we can have a.b.c.d/28 addresses on our ethernet.  This has 
worked great.
However, we want to have dynamic hosts on this network that don't use 
that tunnel and are dynamically assigned.  This means they should get 
IPs from a 192.168.e.0/24 range and be NATed at the gateway.

I don't know how to do this.  I see that there is an (incomplete) page 
dedicated to it at http://linux-ip.net/html/adv-media-share.html.  I 
have iproute2 and iptables on the machine, but don't really understand 
them.  I can set up the DHCP server to give out the right addresses.

I appreciate any help you can give.  Will summarize.  Thanks!

-RYaN
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