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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j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
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