WIPS needed when connecting wireless networks to Firewall ?

Hi all,
We 're considering to implement a wireless network.
One of the security options is using wIPS.
This will cost of course because it needs a mobile security engine and licences for the APs (and WCS).
Another option I see to avoid this cost is by connecting the wireless network to the external firewall. See attachment.
Then a wireless session wil continue to Internet or towards the corporate network.
This firewall will also have an IDS/IPS module.
Is this a viable and effective alternative or am I totally bezirk?
Is wIPS better because of wireless specific issues/challenges?
Thanx for any help.
Greetz Jaap

They're unrelated. The Wips features done by the MSE appliance have nothing to do with what a firewall does. The MSE will check all the information on all the APs to find out possibilities of wireless attacks. For example, authentication floods, denial of service, AP impersonation, ... There are hundreds of different signatures.
Wireless management frames never reach the firewall, only useful data payload does. A firewall will never see if a client is spoofing an AP mac address, if a client is sending "disassociation" frames to all the other clients and so on.

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Solved!
Go to Solution.
Attachments:
Chassis919Tester.vi ‏51 KB
Symmetrical_Pulse_Generator.vi ‏55 KB

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