Small office and Wireless security..which method is best?

May 20, 2006 8 Replies
Small office and Wireless security..which method is best? open original image

I work for a small company (50 computers) and they purchased a Cisco aironet 1231AG. Only 5 laptops will be configured for wireless access to our LAN and to the Internet. We have server 2003 and the laptops will run windows 2000 and xp. I've read that EAP-TLS or PEAP-TLS offer the most security but it seems like a lot of work for 5 laptops. Is there an easier way to get a high level of security without certificates? or just an easier way in general?



check out EAP-FAST

see EAP_FAST Deployment Guide

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see "Configuring an Access Point as a Local Authenticator"

also you could just start with MAC address security where you restrict wirless access based on the wirless NIC MAC address in the 5 PC's

see

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Yes. I would suggest using WPA2 PSK (pre-shared key) aka WPA2 Personal. It uses a pre-shared passphrase that can be very long plus it uses AES encryption. I use this at home where I've got 3-5 mobile devices but at the office I've deployed PEAP with WPA2 for 50+ mobile users who can now sign on to the WLAN with their Active Directory credentials. We're using the former Airespace line of Cisco products but I'll assume that Cisco's other wireless gear includes WPA2 PSK in addition to a multitude of enterprise options.

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-Gary

So along with other poster suggestions, summary of options:

  1. MAC address filter
  2. WPA2 with pre-shared key with/without MAC address filter
  3. LEAP with local RADIUS authentication on AP
  4. EAP-FAST with local RADIUS authentication on AP

First of all, thanks for the responses. I'm going into the office tomorrow to do this so I'm really glad I have some responses to get me started. I'm telneted into the Aironet via VPN right now and I'm looking at the settings for EAP-FAST. The only question I have now is which hardware and operating systems will support EAP-FAST. It sounds like it is built into Windows 2000 SP4 and Windows XP, but does that mean the wireless network adapter does not play a role in compatibility? or is EAP-FAST only supported by certain wireless adapters?

Thanks

Merv wrote:

If all of your adapters are not Cisco then go with WPA2-PSK wjht MAC filters for now

MAC filtering with WEP is advisable but I don't see the point with WPA -- unless you use a weak passphrase or expect someone to guess your strong passphrase. Also, I believe that drivers for recent Intel chipsets support most of the Cisco extensions.

-Gary

I would recommend

PEAPV0 with AES.

Thanks for the tips. I decided to go with EAP-TLS for many reasons but mostly because I would like the challenge and experience of deploying it. The problem is the lack of good documentation on exactly how to do it. I have MS IAS and a few Aironet 1232AG's. Most of the stuff I have read has discussed how it works but I have yet to find anything like a step by step guide with the exception of a word document for doing it in a lab which wasn't quite as good as I had hoped. If there is anyone out there who has done this and can help or provide links to resources I would really appreciate it.

BG wrote:

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