You can configure different VLANs too in your lan segment and have them terminated in your router using difference sub interfaces on the ethernet with respective vlan ids.
In that way you can achieve having different segments without any additional hardware..
Also the access restriction to the other lan segment can be controlled using access-list configured and binded on the interface which can block unnecessary address blocks from accessing the FTP services.
from the sounds of it you purchased a '4 port WAN Interface Card' to be put into your router.
(the HWIC4 cannot be used to create a 'DMZ' as you require; you will need additional Ethernet interfaces, not WAN interfaces)
a few things first...
1) yes you have increased the routers ability to serve more than one network. with an HWIC4, you can configure upto 4 more WAN segments that the router can route for.
2) if you had a 4 port Ethernet Card, then you could configure each interface to act like a DMZ, but without proper security in place, it will not be much more than a 'hop' from one network to another.
NOTE: you need to build very detailed, granular access lists to filter traffic if you wish to have any chance of provding the slightest amount of security to your inside users & hosts.
(a firewall will provide you better security control and DMZ definition and is a recommended best practice for the solution you're looking for)
your DMZ definition says it all, "...subnet between a trusted network and an untrusted network..."
firewalls inherently provide a 'trusted' interface, an 'untrusted' interface and one or more 'less than trusted' or DMZ interfaces.
routers do not inherently provide this type of security segregation. you should be using a firewall to provide your solution and security in this case.
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