Download - Wireless 101
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Wireless 101
Brian HeilConsultant, Ezrasoft Consulting & Design
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Overview
• Why Wireless?
• Security
• Bandwidth
• Cost
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Why Wireless?
• ‘Fixed’ wireless network– Dubuque County Library Epworth
Branch
• Wireless ‘HotSpot’– What are you providing?– What are the risks?– What is the cost?
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Security
• Wireless networks are basically insecure
• What can we do to fix it?– Throw money at the problem– Take steps to mitigate the risks
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Securely Configured WLAN
(translation $$$)
- from Internet Security Systems Wireless LAN Security Technical Whitepaper
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SecurityRisk Mitigation
• Do not use default configuration options on Access Points (wireless routers) – the bad guys know all of these!
• Use as much security provided by the Access Point as possible– WEP– WPA– Hide AP as much as possible
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SecurityRisk Mitigation
• Cover only areas you want to have access. Leakage and maximum transmit power widen the attack surface.
• Client protection – Personal firewalls– Up to date virus scanners
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Bandwidth
• 802.11b bandwidth is 11 Mbps
• 802.11g bandwidth is 54 Mbps
• What is your bandwidth out of the building?– all LAN and WLAN nodes share
this pipe
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Bandwidth
• Access points provide limited connectivity
• How many connected clients will you allow = how many Access Points you will purchase.
• More potential problems with configuration of APs
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Cost
• SOHO vs Enterprise equipment
• Number of clients
• Security costs money– Hardware costs– Staff costs
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Policies
• In lieu of money your WLAN policy is the key
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Policies
• Before you implement WLAN consider– What you are offering and why– Security risks to your LAN– Cost of installation as well as cost
of maintaining security– Impact on current infrastructure
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Questions?
• http://www.ezrasoft.com/ila– Slideshow– Links to resources– See especially the article from
WebJunction entitled: Ten Steps to Wireless Internet Access in Your Library