BAT54-Rail/F..
Release
7.54
06/08
3
Contents
1 Preface 15
2 System design 19
2.1 Introduction 19
3 Wireless LAN – WLAN 21
3.1 What is a Wireless LAN? 21
3.1.1 Standardized radio transmission by IEEE 21
3.1.2 Operation modes of Wireless LANs and base stations 25
3.2 Development of WLAN security 33
3.2.1 Some basic concepts 33
3.2.2 WEP 35
3.2.3 WEPplus 37
3.2.4 EAP and 802.1x 37
3.2.5 TKIP and WPA 40
3.2.6 AES and 802.11i 42
3.2.7 Summary 44
3.3 Protecting the wireless network 45
3.3.1 LEPS—BAT Enhanced Passphrase Security 46
3.3.2 Standard WEP encryption 48
3.3.3 Background WLAN scanning 49
3.4 Configuration of WLAN parameters 52
3.4.1 WLAN security 53
3.4.2 General WLAN settings 62
3.4.3 WLAN routing (isolated mode) 63
3.4.4 The physical WLAN interfaces 64
3.4.5 The logical WLAN interfaces 78
3.4.6 Additional WLAN functions 82
3.5 Extended WLAN protocol filters 87
3.5.1 Protocol filter parameters 88
3.5.2 Procedure for filter test 90
3.5.3 Redirect function 91
3.5.4 DHCP address tracking 92