Terry Gray Networks & Distributed Computing 19 March 2002 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) 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

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

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

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

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

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.