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WIRELESS UPDATE

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Comcast vs. community bandwidth sharing. Shutdowns due to security concerns ... Enterprise access points auth server. Auth policy: perimeter control only ... – PowerPoint PPT presentation

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Title: WIRELESS UPDATE


1
WIRELESS UPDATE
  • Terry Gray
  • Networks Distributed Computing
  • 19 March 2002

2
Whats 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, 20Mbps
  • 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
CC 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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