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Maximizing Wireless Networks in Distributed Computing Environments

Explore the latest in wireless technology, including the imminent arrival of 802.11a, and its impact on liability concerns and network standards. Delve into the implications, challenges, and opportunities presented by the rapid evolution of wireless standards. Learn about the varying 802.11 protocols, global wireless issues, campus challenges, and practical wireless deployment strategies. Discover how to navigate the complexities of wireless networking in enterprise environments and ensure secure, reliable connectivity.

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Maximizing Wireless Networks in Distributed Computing Environments

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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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