Apple Airport Express guest network not really secure?

I've setup several of these devices and they work quite well but I setup the guest network on one and it's in the 172.X.X.X range and the local network is actually on the 192.X.X.X network.If I go to Start and Run and type in \\server it doesn't work but if I do \\192.168.1.2 it asks for the server credentials and allows someone to pull data! That's not a true "guest" network! Is this expected and normal? Do I need to return this device to the store and use something that actually protects the internal network?

GreatGeek wrote:
I've setup several of these devices and they work quite well but I setup the guest network on one and it's in the 172.X.X.X range and the local network is actually on the 192.X.X.X network.If I go to Start and Run and type in \\server it doesn't work but if I do \\192.168.1.2 it asks for the server credentials and allows someone to pull data! That's not a true "guest" network! Is this expected and normal? Do I need to return this device to the store and use something that actually protects the internal network?
It is not actually expected and normal. The guest network should be on a separate vlan to the main network. So even if you can get connection without wireless credentials the only access should be to the internet.
Tell us a bit more of the setup.
What is the main router? Is it setup to isolate vlans?
What about the switch.. again if it is managed or not and how are vlan setup?
What you might find is the Express is designed to work with the Extreme and in extend wireless mode where the network is correctly vlan isolated.
Have you tried another brand of wireless AP, with a guest mode.. because this might actually be a problem of the main router.. as it should not allow access.
I am not saying the Express are perfect by any means.. and people do occasionally report guest network functioning when it should not be.
What is model and firmware they are running.. ?
Are they plugged into the network by ethernet and setup in bridge.. then create a wireless network? Is it setup for roaming rather than extend or have you mixed them??
In the case where you use them in roaming.. the guest network should not work unless there is an airport extreme running as main router to provide vlan support.. or you have a managed switch.

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