Proxim Harmony 802.11a Network Adapter 802.11a Guía de instalación Pagina 114
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Chapter 10
100 Sniffer Technologies
The Expert analyzer provides Expert analysis specifically for wireless
stations at the Wireless Expert layer. In addition, the Expert can
generate many wireless-specific Expert alarms. All of the usual upper
layer Expert analysis is provided. See Expert Objects and Alarms for
Wireless Networks on page 136 and Expert Alarms for Wireless
Networks on page 146.
NOTE: During monitoring or capture, the window title bar shows the channel
currently being monitored, as well as the signal strength and the type of
network being monitored (802.11a or 802.11b/g). You can use this display to
get a quick feel for the strength of the signal being monitored and determine
whether you need to move the analyzer closer to an access point to get a
stronger signal.
Differences Between Wireless Network Displays
In contrast to 802.11b networks, 802.11a and 801.11g networks support much
faster data rates. Whereas 802.11b data rates range from 1 Mbps to 11 Mbps,
802.11a and 802.11g data rates range from 6 Mbps to 54 Mbps. 802.11g is
backwards compatible with 802.11b because they both use the same
frequency spectrum. However, 802.11a uses a different frequency spectrum
than 802.11b/g. 802.11b/g works at the 2.4 to 2.4835 Ghz range and 802.11a
works at the 5.15-5.835Ghz range
.
The major differences between displays for 802.11 networks are related to the
difference in supported rates for the 802.11a/b/g standards. For example:
Displays containing data rate information will have more rate
categories for 802.11a than they will for 802.11b/g. For example, the
Host Table for 802.11b/g networks breaks out each station’s traffic
according to whether it was sent at 1 Mbps, 2 Mbps, 5.5 Mbps, or 11
Mbps. In contrast, the Host Table for 802.11a networks will include data
rate categories for 6 Mbps, 9 Mbps, 12 Mbps, 18 Mbps, 24 Mbps, 36
Mbps, 48 Mbps, 54 Mbps, 72 Mbps, and 108 Mbps (see Notes on
Proprietary Implementations of the 802.11a Standard on page 101 for
information on why there are data rate categories beyond the 54 Mbps
upper limit of the 802.11a standard).
There are more channels on an 802.11a network than there are on an
802.11b/g network. Because of this, channel-related displays (such as
the Channel Surfing tab in the Global Statistics application) will
display more channels for 802.11a than they will for 802.11b/g.
NOTE: Wireless network channels are based on geographical location and
the frequency band allocated in the country.
- Technologies 1
- March, 2005 / 100415 2
- Contents 3
- Wireless Guide v 5
- Wireless Guide vii 7
- Audience 9
- Getting More Information 9
- Wireless Guide xi 11
- [F1] control 11
- Contacting Network General 12
- Wireless Guide xiii 13
- SECTION 1 15
- Introducing Wireless 17
- Functionality 17
- Chapter 1 18
- 4 Sniffer Technologies 18
- Wireless Guide 5 19
- 6 Sniffer Technologies 20
- Installing the 802.11a/b/g 21
- Adapter / Driver 21
- Chapter 2 22
- 8 Sniffer Technologies 22
- Windows 2000 23
- Network Adapter 24
- Wireless Guide 11 25
- 12 Sniffer Technologies 26
- Installing the ORiNOCO 27
- Gold Adapter / Driver 27
- 3 through 12 and 28
- Wireless Guide 15 29
- Chapter 3 30
- 16 Sniffer Technologies 30
- Windows XP 31
- 18 Sniffer Technologies 32
- Updating Existing Drivers 34
- Wireless Guide 21 35
- 22 Sniffer Technologies 36
- Wireless Guide 23 37
- 24 Sniffer Technologies 38
- Installing the Enterasys 39
- 3 through 40
- Wireless Guide 27 41
- Chapter 4 42
- 28 Sniffer Technologies 42
- Wireless Guide 29 43
- First Time Installation 46
- 34 Sniffer Technologies 48
- 36 Sniffer Technologies 50
- Installing the Spectrum 24 51
- 2 through 15. Determine if 52
- Wireless Guide 39 53
- Chapter 5 54
- 40 Sniffer Technologies 54
- Wireless Guide 41 55
- 42 Sniffer Technologies 56
- Wireless Guide 43 57
- 44 Sniffer Technologies 58
- 46 Sniffer Technologies 60
- 48 Sniffer Technologies 62
- Wireless Guide 49 63
- Windows NT 64
- 52 Sniffer Technologies 66
- Installing the Cisco Aironet 67
- Chapter 6 68
- 54 Sniffer Technologies 68
- 3 through 15. Determine if 69
- 0-7F0. Determine if 69
- 56 Sniffer Technologies 70
- Wireless Guide 57 71
- 58 Sniffer Technologies 72
- Wireless Guide 59 73
- 60 Sniffer Technologies 74
- Wireless Guide 63 77
- 64 Sniffer Technologies 78
- Sniffer software is running 79
- 66 Sniffer Technologies 80
- Installing the Proxim 81
- 802.11a Adapters / Drivers 81
- Chapter 7 82
- 68 Sniffer Technologies 82
- Wireless Guide 71 85
- 74 Sniffer Technologies 88
- 76 Sniffer Technologies 90
- SECTION 2 91
- Creating Local Agents for 93
- Wireless LAN Adapters 93
- Chapter 8 94
- 80 Sniffer Technologies 94
- Configuring Wireless LANs 95
- Setting Wireless Options 96
- Setting Configuration Options 97
- 84 Sniffer Technologies 98
- Setting Encryption Options 99
- 128-Bit Encryption 100
- 0x followed by 10 hex 102
- 0x followed by 26 102
- Setting the Security Options 103
- Chapter 9 104
- 90 Sniffer Technologies 104
- 92 Sniffer Technologies 106
- Wireless Guide 93 107
- Wireless Guide 95 109
- 96 Sniffer Technologies 110
- Wireless Guide 97 111
- IP Address,MAC Address 112
- Advanced Features for 113
- Wireless Analysis 113
- Chapter 10 114
- 100 Sniffer Technologies 114
- Standard 115
- How Utilization is Calculated 117
- The Dashboard’s Gauge Tab 118
- The Dashboard’s Detail Tab 118
- Wireless Guide 105 119
- The Dashboard’s 802.11 Tab 120
- Wireless Guide 107 121
- 108 Sniffer Technologies 122
- Wireless Guide 109 123
- 110 Sniffer Technologies 124
- Wireless Guide 111 125
- 112 Sniffer Technologies 126
- 114 Sniffer Technologies 128
- Wireless Guide 115 129
- 116 Sniffer Technologies 130
- Wireless Guide 117 131
- 118 Sniffer Technologies 132
- Wireless Guide 119 133
- Network) 133
- 120 Sniffer Technologies 134
- Wireless Guide 121 135
- Wireless Guide 123 137
- Wireless Guide 125 139
- Utilization statistics 141
- Wireless Guide 129 143
- Error Packet Filters 144
- 132 Sniffer Technologies 146
- Wireless Guide 133 147
- Postcapture WEP Decryption 148
- Networks 150
- Wireless Guide 137 151
- Wireless Guide 139 153
- Traffic Statistics Table 154
- Station Identity Table 154
- Stations Listbox 155
- Alarms Listbox 155
- Object Information 155
- Wireless Guide 143 157
- Wireless Guide 145 159
- Channel Mismatch 160
- PLCP Error 161
- ACK Frame Timeout 161
- Association Failure 162
- Authentication Failure 162
- CTS Frame Timeout 163
- Deauthentication 164
- Disassociation 164
- Mcast/Bcast Fragmentation 165
- Missing Fragment Number 165
- Oversized WLAN Frame 166
- Reassociation Failure 166
- Rogue Access Point 167
- Rogue Mobile Unit 168
- Runt WLAN Frame 169
- WEP-ICV Error 170
- Numerics 171
- 158 Sniffer Technologies 172
- Wireless Guide 159 173
- 160 Sniffer Technologies 174
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