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WIRELESS UPDATE

WIRELESS UPDATE. Terry Gray Networks & Distributed Computing 19 March 2002. What’s New?. 802.11a here sooner/cheaper than predicted Climate of increasing liability concerns More 802.11 standards. 802.11a: Successor?. Faster (54 vs. 11… really 27 vs 6) Shorter distance (30m vs. 100m)

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WIRELESS UPDATE

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  1. WIRELESS UPDATE Terry Gray Networks & Distributed Computing 19 March 2002

  2. What’s New? • 802.11a here sooner/cheaper than predicted • Climate of increasing liability concerns • More 802.11 standards

  3. 802.11a: Successor? • Faster (54 vs. 11… really 27 vs 6) • Shorter distance (30m vs. 100m) • More power consumption • Available now at 2x price of 802 .11b • Incompatible w/ 802.11b installed base • Probably need WAPs for both, or dual-mode WAPs

  4. LAN Wireless Standards • IEEE 802.11 2.4GHz, 1-2Mbps, FHSS, DSSS • IEEE 802.11a 5Ghz, 54Mbps • IEEE 802.11b 2.4Ghz, 11Mbps DSSS (WiFi) • IEEE 802.11e QoS, etc • IEEE 802.11f Inter-AP protocol • IEEE 802.11g 2.4GHz, 20+Mbps • IEEE 802.11h “spectrum managed” 802.11a • IEEE 802.11i Security, incorporating 802.1x • IEEE 802.11j Convergence w/Hiperlan • In US, all use unlicensed “ISM” bands

  5. Global 802.11 Issues • WISPr (wide area) roaming • Comcast vs. community bandwidth sharing • Shutdowns due to security concerns • Shutdowns due to interference

  6. Campus 802.11 Issues • liability --”attractive nuisance” • addressing • roaming • management • ad hoc installations • maturity: 802.11 a e g h i • designing for both 802.11b and a • cost recovery for enterprise deployment

  7. C&C Wireless Approach • Dedicated per-building subnet • addresses, performance, fault isolation • Enterprise access points + auth server • Auth policy: perimeter control only • Assume insecure: use SSH/SSL/K5 • Convenient user configuration • L2 roaming only

  8. Conclusions: Same as Before • 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.

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