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WIRELESS NETWORKING

WIRELESS NETWORKING . Terry Gray, Scott Mah, David Richardson, Marc Hudson UW Computing & Communications January 2002. Agenda. Background Objectives Policy Issues Technology Issues Deployment Status Pricing and Process Conclusions. Wireless Categories. Wireless by Purpose

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WIRELESS NETWORKING

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  1. WIRELESS NETWORKING Terry Gray, Scott Mah, David Richardson, Marc Hudson UW Computing & Communications January 2002

  2. Agenda • Background • Objectives • Policy Issues • Technology Issues • Deployment Status • Pricing and Process • Conclusions

  3. Wireless Categories • Wireless by Purpose • Point-to-Point links • Access networks • Wireless by Spectrum • Optical • Infrared • RF • Wireless by Range...

  4. Wireless RF by Range • PAN/HAN (Personal/Home-Area-Network) • Bluetooth • HomeRF • LAN (Local-Area-Network) • IEEE 802.11 (US) • ETSI HiperLAN2 (Europe) • MAN (Metro-Area-Network) • LMDS, “Fixed Wireless” • WAN (Wide-Area-Network) • Ricochet (R.I.P.) • CDPD • 2.5G, 3G, etc, etc, etc

  5. LAN Wireless Standards • IEEE 802.11 2.4GHz, 1-2Mbps, FHSS, DSSS • IEEE 802.11b 2.4Ghz, 11Mbps DSSS (WiFi) • IEEE 802.11a 5Ghz, 54Mbps • IEEE 802.11e QoS, etc • IEEE 802.11g 2.4GHz, 20+Mbps • In US, all use unlicensed “ISM” bands

  6. 802.11a: Successor? • Faster • Shorter distance • More power consumption • Available this year, but... • Won’t replace 802.11b too soon • Probably need WAPs for both, or dual-mode WAPs

  7. C&C Wireless Objectives • Provide 11 Mb coverage throughout selected facilities • Allow roaming within facility space • Deploy scalable and manageable approach • Provide high-availability service, fully integrated with campus wired net • Balance between secure and convenient

  8. Policy Issues • Part of campus network infrastructure • DIY is OK if it doesn’t interfere… but less convenient for users • Want to allow temp or small-scale ad hoc deployments with minimum overhead • Large-scale deployments need to be coordinated with C&C • Campus-wide access control policy • Security/abuse liability

  9. Technical Issues • Infrastructure & Topology • Roaming • Access control & Security • Interoperability & Obsolescence • QoS • Interference • Relationship to Bluetooth, etc • Manageability

  10. Wired vs. Wireless Issues • Server suitability • Performance • Performance variation • Price/Performance • Interference • Technology maturity • Advanced services • Security

  11. Infrastructure Requirements

  12. Roaming • Layer 2 (802.11) vs. Layer 3 (Mobile IP) • Vendor incompatibility • LAN vs. WAN • We will support L2 roaming within a building by dedicating one subnet for all access points in the building.

  13. Current Access Control Policy • Goals: • avoid embarrassment of drive-by hackers doing bad things via UW network • avoid numerous problems with getting windows login to work thru firewalls • Implementation: • Auth required only for off-campus access • All UWnetID holders are authorized • Roaming between buildings not supported

  14. Access Control Deployment • Using a commercial product from Vernier • Provides access control for "downstream" networks (wired or wireless) • Supports L3 roaming, transparent to client • Uses NAT • No special s/w required on client machines • Intercepts port 80 requests • Incorporates UW pubcookie authentication • MAC-address-based security

  15. Access Control Futures • Need to look at performance issues closely • Evaluating feasibility of adding pubcookie authentication to C&C Logical Firewall

  16. Operational Challenges • Performance monitoring • Performance problem diagnosis • Capacity planning • QoS • Abuse tracking

  17. Current Deployments • C&C Pilot Project • Kane Hall, Rm. 130 • Mary Gates Hall • Gerberding Hall • Odegaard Undergraduate Library • Other wireless projects • CS&E, C&C, Business, Law, MCIS, ...

  18. Pilot Project Lessons Learned • Success depends on cooperation w/dep’ts • It takes more wire than you think! • Site surveys & frequency sweeps needed. • WEP is not secure; use SSH, SSL, etc. • Technology still evolving • 2.4GHz phones interfere badly

  19. How much does it cost? • Wireless survey • Facilities pathways, electrical, and asbestos abatement • New subnet for wireless access points • Installation of wireless access points • Ongoing operations, maintenance, and security for wireless access points

  20. Monthly Rates • $75 per month per access point • $500 installation per access point If equipment and project is funded through one-time capital dollars, then the monthly rate for operations and maintenance is: • $35 per month per access point

  21. Ordering Wireless Solutions • Wireless networking Web site www.washington.edu/computing/wireless/ • Initiate request by email to install@cac.washington.edu • Call 206-543-5068 • Project assigned to a Customer Account Manager to coordinate activities within C&C and contractors

  22. Conclusions • Wireless is very addictive. • It will be very popular. • It will be very problematic. • It will cost more than you expect • In offices, it is not a replacement for wired. • The dust has not settled.

  23. References • Wireless Ethernet Compatibility Alliance (WECA) • Wireless LAN Association (WLANA) • Portable Computer & Communications Association (PCCA) • Internet Engineering Task Force (IETF) • WAP Forum • Bluetooth Special Interest Group • Mobile Wireless Internet Forum (MWIF) • Wireless Information Networks Forum (WINForum) • Wireless Data Forum • http://www.80211-planet.com/ • http://www.wireless-nets.com/guide.htm • http://www.practicallynetworked.com/

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