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Wireless Networks: Personal, Local, Metropolitan

Explore the latest in wireless technology, including speed enhancements, power efficiencies, and improved security protocols. Learn about personal, local, and metropolitan networks. Delve into the world of Bluetooth and secure wireless connections.

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Wireless Networks: Personal, Local, Metropolitan

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  1. Wireless Networks: Personal, Local, Metropolitan Speedups, Security, Power John Schafer University of Michigan Ann Arbor CSG 10 May 2000 jbs@umich.edu www.itcom.itd.umich.edu/wireless/

  2. Overview • Current choices • Speedups coming • Power over Ethernet • Authenticated Wireless • Wireless Personal Area Network: Bluetooth • Point-to-point Wireless Metropolitan Area Networking

  3. Terminology • Access point (AP), station adapter • WEP (Wired Equivalent Privacy) • Encryption of data packets, 40 or 128 bit • Access control table - list of MAC addresses • Speeds are nominal, throughput is about one half

  4. Current Choices *sleep/transmit

  5. Speedups Coming

  6. Speedups of questionable value • HiperLAN1 • Only one vendor with plans, wait for HiperLAN2 or 802.11a • 22 Mbps 802.11b • First meeting May 8-12, 2000 • Skip it and wait for 802.11a, 54 Mbps • 10 Mbps Frequency Hopper (IEEE 802.11) • Needs FCC rule change, seems unlikely

  7. Power over Ethernet • Conduit to power AP: $800, Enet: $300 • Several methods being discussed (IEEE) • Use spare wire pairs on CAT5 cable • Couple DC power on signal pairs • Smart - only turn on power to responsive device • Applications - VoIP phones, Security, AP’s • Built into future switches/hubs • Standard due 3Q2001

  8. Problems with current security • Encryption keys set the same for all users • Password for network given to all users • Access control table updated manually • Access control based on MAC address - spoofable

  9. Authenticated Wireless • Radius client in access point • IEEE 802.1x is working on a standard • Lucent first to market ahead of standard

  10. Lucent Access Server AS-1000 • Diffie-Hellman key exchange • Per user, per session key used for WEP encryption • Setup PPP link • RADIUS client in AP - RADIUS servers - Kerberos • Limitations: • First version - No Roaming • User must exist in authentication system before first connection

  11. Merit RADIUS system, ABS, PTS • State-wide: 800 modem pools, 160 RADIUS servers • Accounting and Billing System (ABS) • Protection Server (PTS) • AS-1000 looks like a modem pool • Auto-subscribe, monthly billing, usage charges, grant access based on PTS groups

  12. Adapting IEEE 802.1x to 802.11 • Based on existing standards • Extensible Authentication Protocol (EAP) • RADIUS • Dynamic key management • Roaming - handoff of keys to AP • Unauthenticated VLAN support - access to registration/enrollment server (optional) • Expected Summer 2001 • http://grouper.ieee.org/groups/802/1/index.html

  13. Bluetooth • Wireless Personal Area Network (PAN) • IEEE 802.15 • Asynch data and up to 3 voice channels • Data: asymmetric 721 Kbps/57 Kbps, symmetric 432.6 Kbps • Uses same 2.4 GHz band as 802.11 • Fast Frequency Hopper, 1600 hops/sec. • Interferes with 802.11 WLANs

  14. Ericsson Bluetooth Module

  15. Bluetooth - Applications • Replace infrared and custom cables • Computers, PDAs, Palmtops, Mobile phones • Headsets, Digital cameras, Automobiles • Bluetooth SIG has 1400 member companies • Plan to migrate your WLANs to 5 GHz band • http://www.bluetooth.com/ • http://www.bluetooth.net/

  16. Wireless Metropolitan Area Nets • Point-to-point and point-to-multipoint • Unlicensed (2.4 GHz ISM band) • WLAN hardware plus external antennas • Speed: 1-5 Mbps, Distance: <20 miles • Licensed spectrum • Local Multi-point Distribution Service (LMDS) • FCC auction in spring of 1998, 38 GHz band • Line-of-site, up to 5 miles, up to 45 Mbps • Laser

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