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ZyAIR Wireless Gateway Series User’s Guide
11-8 Introduction to Firewalls
Figure 11-5 Stateful Inspection
The previous figure shows the ZyAIR’s default firewall rules in action as well as demonstrates how stateful
inspection works. User A can initiate a Telnet session from within the LAN and responses to this request are
allowed. However other Telnet traffic initiated from the WAN is blocked.
- User's Guide 1
- Copyright 2
- (FCC) Interference Statement 3
- ZyXEL Limited Warranty 4
- Customer Support 5
- Table of Contents 6
- List of Figures 15
- List of Tables 21
- Preface 24
- Part I: 27
- Chapter 1 29
- ZyAIR LED 31
- Output Power Management 31
- SSL Passthrough 31
- Logging and Tracing 34
- Diagnostics Capabilities 34
- Wireless Association List 34
- Wireless LAN Channel Usage 34
- Chapter 2 37
- 2.3 Resetting the ZyAIR 38
- Chapter 3 41
- Wizard Setup 41
- 3.4.2 PPTP Encapsulation 47
- 3.4.3 PPPoE Encapsulation 49
- 3.5.4 WAN MAC Address 53
- 3.6 Basic Setup Complete 55
- 3-16 Wizard Setup 56
- Figure 3-7 Setup Complete 56
- Part II: 57
- Chapter 4 59
- System Screens 59
- 4.3 Dynamic DNS 60
- 4.4 Configuring Dynamic DNS 61
- 4.5 Configuring Password 62
- 4.6 Configuring Time Setting 63
- Table 4-4 Time Setting 65
- Chapter 5 67
- LAN Screens 67
- 5.3 DHCP Setup 68
- 5.4 Factory LAN Defaults 68
- 5.5 RIP Setup 68
- 5.6 Multicast 69
- LAN Screens 5-5 71
- Table 5-1 IP 71
- 5-6 LAN Screens 72
- Chapter 6 73
- 6.1.3 ESS 74
- 6.2 Wireless LAN Basics 75
- 6.3 Configuring Wireless 77
- Wireless LAN 78
- 6.4 Configuring Roaming 79
- Table 6-2 Roaming 82
- Chapter 7 83
- Wireless Security 83
- 7.2.2 Authentication 84
- 7-4 Wireless Security 86
- 7.4 MAC Filter 87
- 7.5 802.1x Overview 89
- 7.6 Introduction to RADIUS 89
- Ethernet 91
- RADIUS Server 91
- Wireless Station 91
- 7.9 Configuring 802.1x 92
- 7-12 Wireless Security 94
- 7.11 Configuring RADIUS 96
- Table 7-5 RADIUS 97
- Part III: 99
- Chapter 8 101
- WAN Screens 101
- Service Type 102
- 8.2.2 PPPoE Encapsulation 103
- 8-4 WAN Screens 104
- 8.2.3 PPTP Encapsulation 105
- 8-6 WAN Screens 106
- DESCRIPTION 107
- Part IV: 111
- Chapter 9 113
- Address Translation (NAT) 113
- 9.1.2 What NAT Does 114
- 9.1.3 How NAT Works 114
- 9.1.4 NAT Application 115
- 9.1.5 NAT Mapping Types 116
- 9.2 SUA Server 118
- Default Server IP Address 118
- 9.3 Configuring SUA Server 120
- 9-12 SUA/NAT 124
- Chapter 10 125
- Static Route 125
- 10-4 Static Route 128
- Part V: 129
- Chapter 11 131
- Introduction to Firewalls 131
- 11.4 Denial of Service 132
- 11.4.1 Basics 133
- 11.4.2 Types of DoS Attacks 134
- 5 REDIRECT 136
- 13 TIMESTAMP_REQUEST 136
- 14 TIMESTAMP_REPLY 136
- 17 ADDRESS_MASK_REQUEST 136
- 18 ADDRESS_MASK_REPLY 136
- 11.5 Stateful Inspection 137
- Chapter 12 139
- Firewall Screens 139
- 12.3 Rule Logic Overview 140
- 12.4.1 LAN to WAN Rules 142
- 12.4.2 WAN to LAN Rules 142
- 12.5 Enabling Firewall 143
- LABEL DESCRIPTION 146
- Restrict Web 146
- Features 146
- Firewall Screens 12-9 147
- Table 12-2 Firewall Filter 147
- Firewall Screens 12-11 149
- 12.5.3 Predefined Services 150
- Firewall Screens 12-13 151
- SERVICE DESCRIPTION 152
- Chapter 13 153
- Remote Management 153
- 13.2 Telnet 154
- 13.3 Configuring TELNET 155
- 13.4 Configuring FTP 156
- 13.5 Configuring WWW 157
- 13.6 Configuring SNMP 158
- 13.6.1 Supported MIBs 160
- 13.6.2 SNMP Traps 160
- LABEL DESCRIPTION 161
- SNMP Configuration 161
- Get Community 161
- 13.7 Configuring DNS 162
- 13.8 Configuring Security 163
- Part VI: 165
- Chapter 14 167
- UPnP Screen 167
- 14.2 UPnP and ZyXEL 168
- 14.3 Configuring UPnP 168
- DESCRIPTION 169
- Chapter 15 177
- Logs Screens 177
- 15-4 Logs Screens 180
- Figure 15-2 Log Settings 180
- Logs Screens 15-5 181
- Table 15-2 Log Settings 181
- 15.3 Configuring Reports 182
- 15.3.1 Viewing Protocol/Port 184
- Part VII: 188
- Chapter 16 190
- Maintenance 190
- 16.3 DHCP Table Screen 192
- 16.4 Wireless Screen 193
- 16.4.1 Channel Usage 194
- 16.5 F/W Upload Screen 197
- 16.6 Configuration Screen 199
- Part VIII: 204
- Chapter 17 206
- Introducing the SMT 206
- 17.2.1 Initial Screen 207
- 17.2.2 Entering Password 207
- 17-4 Introducing the SMT 209
- 17-6 Introducing the SMT 211
- Table 17-2 Main Menu Summary 211
- Introducing the SMT 17-7 212
- General and WAN Setup 214
- Chapter 18 214
- 18.2 WAN Setup 218
- Table 18-3 Menu 2 WAN Setup 219
- Chapter 19 220
- LAN Setup 220
- 19.3 IP Alias 223
- 19.3.1 IP Alias Setup 224
- 19.4 Wireless LAN Setup 225
- FIELD DESCRIPTION EXMAPLE 228
- 19-12 LAN Setup 231
- Chapter 20 232
- Internet Access 232
- 20.2 Internet Access Setup 233
- Part IX: 235
- Chapter 21 237
- Remote Node Configuration 237
- 21.1.3 Remote Node Setup 240
- 21.2 Remote Node Filter 242
- 21.2.1 IP Static Route Setup 243
- FIELD DESCRIPTION 244
- Chapter 22 247
- Dial-in User Setup 247
- 22-2 Dial-in User Setup 248
- Chapter 23 249
- 23.2 NAT Setup 250
- 23.2.1 Address Mapping Sets 251
- 23.4 General NAT Examples 257
- INTERNET 264
- FIELD DESCRIPTION EXAMPLE 265
- Real Audio 265
- 23-18 NAT 266
- Part X: 267
- Chapter 24 269
- Filter Rule 270
- Filter Set 270
- 24.3.1 TCP/IP Filter Rule 274
- 24.3.2 Generic Filter Rule 279
- 24.4 Filter Types and NAT 280
- 24.5 Example Filter 281
- 24.6.1 Ethernet Traffic 284
- 24.6.2 Remote Node Filters 284
- 24.7 Firewall Setup 285
- Chapter 25 287
- Chapter 26 289
- System Security 289
- 26.1.3 802.1x 291
- System Security 26-5 293
- Chapter 27 295
- 27.2 System Information 297
- 27.2.2 Console Port Speed 298
- 27.3 Log and Trace 299
- 27.3.2 UNIX Syslog 300
- 27.4 Diagnostic 301
- Chapter 28 303
- 28.2 Backup Configuration 304
- 28.2.1 Backup Configuration 305
- 28.2.4 GUI-based FTP Clients 306
- 28.2.7 TFTP Command Example 307
- Starting XMODEM download 308
- 28.3 Restore Configuration 309
- 28.3.1 Restore Using FTP 310
- 28.4.1 Firmware File Upload 312
- 28.4.5 TFTP File Upload 314
- Choose the Xmodem protocol 316
- Then click Send 316
- Chapter 29 319
- 24.8 to 24.10 319
- 29.2 Call Control Support 320
- 29.2.2 Call History 321
- 29.3 Time and Date Setting 322
- 29.3.1 Resetting the Time 323
- Chapter 30 325
- 30.6 System Timeout 328
- Chapter 31 329
- Call Scheduling 329
- Schedules= 1,2,3,4 332
- Part XI: 333
- Appendix A 335
- Troubleshooting 335
- Problems with Telnet 337
- Appendix B 339
- Protection 339
- Appendix C 341
- Windows 2000/NT/XP 344
- Macintosh OS 8/9 348
- Macintosh OS X 350
- Appendix D 353
- Appendix E 357
- Client computer 358
- Appendix F 359
- Types of EAP Authentication 359
- Appendix G 361
- Recommendation 361
- Positioning Antennas 362
- Connector Type 362
- Appendix H 363
- How PPPoE Works 364
- ZyAIR as a PPPoE Client 364
- Appendix I 365
- PPTP Protocol Overview 366
- Call Connection 366
- PPP Data Connection 367
- Appendix J 369
- IP Subnetting 369
- Subnet Masks 370
- Subnetting 370
- Example: Two Subnets 371
- Example: Four Subnets 373
- Example Eight Subnets 374
- Appendix K 377
- Command Interpreter 377
- Appendix L 379
- NetBIOS Filter Commands 379
- NetBIOS Filter Configuration 380
- Appendix M 381
- Boot Commands 381
- Appendix N 383
- Log Descriptions 383
- Log Commands 386
- Displaying Logs 387
- Log Command Example 387
- Appendix O 389
- Power Adaptor Specifications 389
- Appendix P 391
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