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what makes a DMZ?

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What i am confused about here... with regard to setting up guest wireless. Is how a DMZ works.

I have set up two separate Wireless Access points. Both Vigor AP 700's. One is plugged into my switch and give standard run-of-the-mill access to my internal LAN. (192.168.1.1/24)

The second Wireless AP is plugged into a separate EthX port on my UTM box. This then gets issued its OWN DHCP server in UTM9 on a different subnet....192.168.2.1/24

I understand that the DHCP issued addresses prevents traffic from the two subnets mixing. BUT, isn't it just simply a case of making my ip address static in windows... and changing the subnet mask to 255.255.248.0. That then gives me access to the OTHER subnet?

This isn't a true DMZ then is it? or are we just relying on people not doing static IP addresses?

Bit of a nooby question i guess... but it just strikes me as wierd.

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