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restricting the physical size of wifi network

Answered Question
May 13th, 2009
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Hi,

I'm planning to cover the 80x80m building by the amount of 1131AG APs and WLC4402 controller. But the strong client's demand is to physically restrict any posibilities of wifi connections from the long distances (100m and more from building).

Is there a feature in Cisco wifi to drop any incoming connections in case if client is 100+m from AP? (I mean that client's power is high enough for this)

What are the regular methods of resricting the physical size of wifi networks?

Thanks.

Correct Answer by scottmac about 8 years 3 months ago

This is exactly the case for knowing and understanding antenna types and patterns (i.e., what those goofy circle charts mean).


By using an antenna's pattern, coupled with power management, you can easily limit the radiation and external exposure of the signal.


You don't have to know every single antenna, but just be familiar with the general types, and how to interpret the charts.


Here's a pretty decent explanation on Cisco's main site:

http://www.cisco.com/en/US/prod/collateral/wireless/ps7183/ps469/prod_white_paper0900aecd806a1a3e.html


Good Luck

Scott


Correct Answer by Leo Laohoo about 8 years 3 months ago

One method of restricting the size of a wifi network's footprint would be to conduct a Wireless Site Survey. You can minimize the leaking of the wireless network outside of the premises/property.


You can also have a play with the Radio Resource Management to scale down the signal strengths of the AP.


For Security, disable SSID broadcast and use WPA/WPA2 and AES/TKIP.

Correct Answer by Robert.N.Barrett_2 about 8 years 3 months ago

Someone could be more than 100m away using a parabolic grid antenna, and their signal strength may not look any different from your regular users.


You could try using the locate appliance, but I think even that could go a little goofy if someone tries to spoof a MAC address.

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Correct Answer
Robert.N.Barrett_2 Wed, 05/13/2009 - 13:39
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Someone could be more than 100m away using a parabolic grid antenna, and their signal strength may not look any different from your regular users.


You could try using the locate appliance, but I think even that could go a little goofy if someone tries to spoof a MAC address.

Correct Answer
Leo Laohoo Wed, 05/13/2009 - 14:47
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One method of restricting the size of a wifi network's footprint would be to conduct a Wireless Site Survey. You can minimize the leaking of the wireless network outside of the premises/property.


You can also have a play with the Radio Resource Management to scale down the signal strengths of the AP.


For Security, disable SSID broadcast and use WPA/WPA2 and AES/TKIP.

Correct Answer
scottmac Wed, 05/13/2009 - 17:29
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  • Green, 3000 points or more

This is exactly the case for knowing and understanding antenna types and patterns (i.e., what those goofy circle charts mean).


By using an antenna's pattern, coupled with power management, you can easily limit the radiation and external exposure of the signal.


You don't have to know every single antenna, but just be familiar with the general types, and how to interpret the charts.


Here's a pretty decent explanation on Cisco's main site:

http://www.cisco.com/en/US/prod/collateral/wireless/ps7183/ps469/prod_white_paper0900aecd806a1a3e.html


Good Luck

Scott


Robert.N.Barrett_2 Wed, 05/13/2009 - 22:15
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  • Bronze, 100 points or more

I second that - thanks for the rating!


Just be aware (or make your customer aware) that even with doing your best to restrict the coverage areas, someone with specialized antennas will still likely be able to pick up signals and capture data over the air. Strong encryption of wireless data is a must.

Leo Laohoo Wed, 05/13/2009 - 21:51
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    The Hall of Fame designation is a lifetime achievement award based on significant overall achievements in the community. 

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Thanks for the rating.

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