Cisco 1231G - Aironet - Wireless Access Point Especificaciones Pagina 120
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Chapter 4 Security Setup
Security Overview
4-8
Cisco Aironet 1200 Series Access Point Software Configuration Guide
OL-2159-01
During shared key authentication, the access point sends an unencrypted
challenge text string to any device attempting to communicate with the access
point. The device requesting authentication encrypts the challenge text and
sends it back to the access point. If the challenge text is encrypted correctly,
the access point allows the requesting device to authenticate. Both the
unencrypted challenge and the encrypted challenge can be monitored,
however, which leaves the access point open to attack from an intruder who
calculates the WEP key by comparing the unencrypted and encrypted text
strings. Because of this weakness, shared key authentication can be less
secure than open authentication. Like open authentication, shared key
authentication does not rely on a RADIUS server on your network.
Figure 4-5 shows the authentication sequence between a device trying to
authenticate and an access point using shared key authentication. In this
example the device’s WEP key matches the access point’s key, so it can
authenticate and communicate.
Figure 4-5 Sequence for Shared Key Authentication
Protecting the Access Point Configuration with User Manager
The access point’s user manager feature prevents unauthorized entry to the access
point management system. You create a list of administrators authorized to view
and adjust the access point settings; unauthorized users are locked out. See the
“Setting Up Administrator Authorization” section on page 4-38 for instructions
on using the user manager.
Access point
or bridge
with WEP key = 123
Client device
with WEP key = 123
1. Authentication request
2. Unencrypted challenge
3. Encrypted challenge response
4. Authentication response
54584
- Cisco Aironet 1
- 1200 Series Access Point 1
- Software Configuration Guide 1
- CONTENTS 3
- 3 Configuration 3-1 4
- 4 Security Setup 4-1 6
- 5 Network Management 5-1 7
- 7 Management System Setup 7-1 9
- 8 Special Configurations 8-1 9
- Contents 10
- OL-2159-01 10
- Channels A-2 11
- Protocol Filter Lists B-1 11
- Audience and Scope 13
- Organization 13
- Conventions 14
- Related Publications 15
- Obtaining Documentation 16
- Documentation Feedback 17
- Cisco.com 17
- Technical Assistance Center 18
- Cisco TAC Escalation Center 19
- Overview 21
- Key Features 22
- Management Options 22
- Chapter 1 Overview 23
- Root Unit on a Wired LAN 24
- • Using SNMP, page 2-10 27
- Step 1 Start the browser 28
- Navigation Links 29
- Configuration Action Buttons 29
- Connecting the Serial Cable 32
- Figure 2-4 CLI Page Example 34
- Using a Telnet Session 35
- Using SNMP 36
- Basic Settings 40
- Entering Basic Settings 41
- Configuration Server Protocol 42
- Default IP Address 42
- Default IP Subnet Mask 42
- Default Gateway 42
- Radio Service Set ID (SSID) 43
- Role in Radio Network 43
- SNMP Admin. Community 45
- Filter Setup 46
- Creating a Protocol Filter 47
- Figure 3-6 Filter Set Page 48
- MAC Address Filtering 51
- Creating a MAC Address Filter 52
- Radio Configuration 56
- Primary Port Settings 58
- Service Set ID (SSID) 59
- Enable World Mode 61
- Data Rates 62
- Transmit Power 63
- Frag. Threshold 63
- RTS Threshold 63
- Max. RTS Retries 64
- Max. Data Retries 64
- Beacon Period 64
- Data Beacon Rate (DTIM) 64
- Radio Channel 64
- Restrict Searched Channels 65
- Requested Status 69
- Packet Forwarding 69
- Radio Cell Role 70
- Use Aironet Extensions 71
- Bridge Spacing 73
- Accept Authentication Types 73
- Require EAP 73
- Specified Access Points 74
- Ethernet Configuration 75
- Entering Identity Information 76
- Server Setup 82
- Entering Time Server Settings 83
- • Use Daylight Savings Time 83
- Simple Network Time Protocol 84
- Default Time Server 84
- GMT Offset (hr) 84
- Use Daylight Savings Time 84
- Manually Set Date and Time 84
- Entering Boot Server Settings 85
- BOOTP Server Timeout (sec) 87
- DHCP Class Identifier 88
- Allow Non-Console Browsing 89
- HTTP Port 89
- Default Help Root URL 89
- Extra Web Page File 90
- Default Web Root URL 90
- Entering Name Server Settings 91
- Domain Name System 92
- Default Domain 92
- Domain Name Servers 92
- Domain Suffix 92
- Entering FTP Settings 93
- Routing Setup 94
- Entering Routing Settings 95
- New Network Route Settings 96
- Installed Network Routes list 96
- Stations to Show 98
- Fields to Show 98
- Packets To/From Station 99
- Bytes To/From Station 99
- Primary Sort 100
- Secondary Sort 100
- Chapter 3 Configuration 101
- Event Notification Setup 103
- Event Handling Setup Page 106
- Disposition of Events 108
- Clear Alert Statistics 109
- Purge Trace Buffer 109
- SNMP Trap Destination 111
- SNMP Trap Community 111
- Syslog Destination Address 112
- Syslog Facility Number 112
- Security Setup 113
- Security Overview 114
- Chapter 4 Security Setup 115
- Network Authentication Types 116
- Setting Up WEP 121
- Using SNMP to Set Up WEP 124
- Advanced page 126
- Setting Up EAP Authentication 131
- Credits page 154
- Network Management 155
- Using the Association Table 156
- Setting the Display Options 157
- Using Station Pages 157
- 209.165.201.5 158
- Information on Station Pages 159
- To Station Information 160
- From Station Information 161
- Hops and Timing Information 162
- Performing a Ping 163
- Performing a Link Test 163
- Using the Network Map Window 165
- Figure 5-5 Network Map Window 166
- Figure 5-6 CDP Setup Page 167
- Assigning Network Ports 168
- Accounting Attributes 173
- Server (continued) 174
- Managing Firmware and 177
- Configurations 177
- Updating Firmware 178
- Updating from a File Server 181
- Distributing Firmware 184
- Distributing a Configuration 185
- Configuration 186
- Uploading a Configuration 188
- Uploading from a File Server 189
- Resetting the Configuration 190
- Restarting the Access Point 191
- Management System Setup 193
- SNMP Setup 194
- Using the Database Query Page 195
- Console and Telnet Setup 197
- Special Configurations 199
- Access Point 200
- (Root Unit) 200
- (Repeater) 200
- Wired LAN 200
- Using Hot Standby Mode 204
- Using Diagnostic Pages 208
- Antenna Alignment Test 209
- Carrier Test 211
- Network Ports Page 212
- Data Received 214
- Data Transmitted 214
- 172.16.24.0 215
- Configuration Information 216
- Receive Statistics 216
- Transmit Statistics 217
- AP Radio Page 218
- Display Options 221
- Event Log Page 222
- Log Headings 223
- Saving the Log 223
- Event Log Summary Page 224
- Entering Diagnostic Commands 226
- Diagnostic Command Results 226
- :eap_diag1_on 227
- :eap_diag2_on 227
- :vxdiag_arpshow 228
- :vxdiag_checkstack 230
- :vxdiag_hostshow 231
- :vxdiag_i 232
- :vxdiag_ipstatshow 233
- :vxdiag_memshow 234
- :vxdiag_muxshow 235
- :vxdiag_routeshow 236
- :vxdiag_tcpstatshow 237
- Tracing Packets 238
- Viewing Packet Trace Data 241
- Packets Stored in a Log File 242
- Packets Displayed on the CLI 243
- Ethernet 244
- Checking Basic Settings 246
- APPENDIX 251
- Channels 252
- Protocol Filter Lists 257
- Cisco IAPP — 2887 264
- Radio Free Ethernet RFE 5002 264
- World mode 3-23 272
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