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Firewall and Content Filters
V
Part V:
Firewall and Content Filters
This part introduces firewalls in general and the ZyWALL firewall. It also explains how to configure
the ZyWALL firewall and content filtering.
- ZyWALL 2 Series 1
- Copyright 2
- Interference Statement 3
- Caution 4
- ZyXEL Limited Warranty 5
- Customer Support 6
- Table of Contents 7
- List of Figures 15
- List of Tables 22
- Preface 26
- Graphics Icons Key 27
- Part I: 29
- Chapter 1 31
- Getting to Know Your ZyWALL 31
- 1.2.1 Physical Features 32
- 1.2.2 Non-Physical Features 32
- RoadRunner Support 36
- Logging and Tracing 36
- Upgrade ZyWALL Firmware 36
- Chapter 2 39
- 2.3 Resetting the ZyWALL 40
- LINK TAB FUNCTION 42
- Chapter 3 47
- Wizard Setup 47
- 3.3 Internet Access 48
- 3.3.2 PPPoE Encapsulation 50
- 3.3.3 PPTP Encapsulation 52
- 3.4 WAN and DNS 54
- 3.4.4 WAN MAC Address 56
- 3.5 Basic Setup Complete 58
- Wizard Setup 3-13 59
- Part II: 61
- Chapter 4 63
- System Screens 63
- 4-2 System 64
- 4.3 Dynamic DNS 65
- 4.4 Configuring Dynamic DNS 65
- 4.5 Configuring Password 67
- 4.7 Configuring Time Setting 69
- System 4-9 71
- Table 4-5 Time Setting 71
- Chapter 5 73
- LAN Screens 73
- 5.5 LAN TCP/IP 74
- 5.6 Configuring IP 75
- Figure 5-1 IP 76
- Table 5-1 IP 76
- LAN 5-5 77
- 5.7 Configuring Static DHCP 78
- 5.8 Configuring IP Alias 79
- 5-8 LAN 80
- LAN 5-9 81
- Table 5-3 IP Alias 81
- Part III: 83
- Chapter 6 85
- WAN Screens 85
- 6.4 Configuring Route 86
- 6.5 Configuring WAN ISP 87
- 6.5.2 PPPoE Encapsulation 89
- 6.5.3 PPTP Encapsulation 91
- 6.6 Configuring WAN IP 93
- 6.8 Traffic Redirect 98
- ZyWALL 2 Series User’s Guide 100
- Figure 6-9 Traffic Redirect 100
- Table 6-8 Traffic Redirect 100
- 6.11 Advanced Modem Setup 106
- 6.11.3 Response Strings 107
- Table 6-10 Advanced Setup 108
- Chapter 7 111
- Wireless LAN Screens 111
- 7-2 Wireless LAN Screens 112
- 7.3 Wireless Security 113
- 7-4 Wireless LAN Screens 114
- Table 7-1 Wireless 115
- 7.5 Configuring MAC Filter 116
- 7.6 802.1x Overview 117
- 7-8 Wireless LAN Screens 118
- 7.7 Local User Database 119
- 7.8 Configuring 802.1X 119
- 7-10 Wireless LAN Screens 120
- Part IV: 121
- Chapter 8 123
- 8.1.3 How NAT Works 124
- 8.1.4 NAT Application 125
- 8.1.5 NAT Mapping Types 125
- 8.2 Using NAT 126
- 8.3 SUA Server 127
- IP address 128
- 8.4 Configuring SUA Server 129
- Configuring Address Mapping 132
- LABEL DESCRIPTION 135
- 8-14 NAT 136
- Table 8-7 Trigger Port 136
- Chapter 9 137
- Static Route Screens 137
- 9-4 Static Route Screens 140
- Part V: 141
- Chapter 10 143
- Firewalls 143
- 10.4 Denial of Service 145
- 10.4.2 Types of DoS Attacks 146
- 5 REDIRECT 148
- 13 TIMESTAMP_REQUEST 148
- 14 TIMESTAMP_REPLY 148
- 17 ADDRESS_MASK_REQUEST 148
- 18 ADDRESS_MASK_REPLY 148
- 10.5 Stateful Inspection 149
- 10.5.3 TCP Security 152
- 10.5.4 UDP/ICMP Security 152
- 10.5.5 Upper Layer Protocols 153
- 10.7.1 Packet Filtering: 154
- 10.7.2 Firewall 154
- Chapter 11 157
- Firewall Screens 157
- 11.3 Rule Logic Overview 158
- Service 159
- Source Address 159
- Destination Address 159
- 11.4.1 LAN to WAN Rules 160
- 11.4.2 WAN to LAN Rules 160
- 11.5 Alerts 161
- 11.6 Configuring Firewall 161
- Firewall Screens 11-7 163
- Firewall Screens 11-9 165
- 11-10 Firewall Screens 166
- Address 168
- 11-14 Firewall Screens 170
- 11.8 Predefined Services 174
- Firewall Screens 11-19 175
- 11.9.1 Threshold Values 177
- 11.9.2 Half-Open Sessions 177
- Firewall Screens 11-23 179
- Table 11-6 Attack Alert 179
- Chapter 12 181
- Content Filtering Screens 181
- Part VI: 199
- Chapter 13 201
- Introduction to IPSec 201
- 13.1.4 VPN Applications 202
- 13.2 IPSec Architecture 203
- 13.3 Encapsulation 204
- 13.4 IPSec and NAT 205
- Chapter 14 207
- VPN Screens 207
- 14.3 My IP Address 208
- 14.4 Secure Gateway Address 208
- 14.5 Summary Screen 209
- 14.6 Keep Alive 211
- 14.7 NAT Traversal 212
- 14.7.3 Remote DNS Server 213
- 14.8 ID Type and Content 214
- 14.9 Pre-Shared Key 216
- 14.10 VPN Implementation 216
- 14-12 VPN Screens 218
- VPN Screens 14-13 219
- 14-14 VPN Screens 220
- VPN Screens 14-15 221
- 14-16 VPN Screens 222
- VPN Screens 14-17 223
- 14-18 VPN Screens 224
- VPN Screens 14-19 225
- 14-20 VPN Screens 226
- 14.12 IKE Phases 227
- 14.12.1 X-Auth and IKE 229
- 14.12.2 Negotiation Mode 229
- 14.12.3 Pre-Shared Key 229
- DESCRIPTION 231
- 14.14 Manual Key Setup 234
- 14-30 VPN Screens 236
- Table 14-9 VPN Manual Setup 236
- VPN Screens 14-31 237
- 14-32 VPN Screens 238
- 14.16 SA Monitor 239
- 14.17 Global Settings 240
- Part VII: 245
- Chapter 15 247
- Certificates 247
- 15.3 Configuration Summary 248
- 15.4 My Certificates 249
- 15-4 Certificates 250
- Table 15-1 My Certificates 250
- 15.7 Creating a Certificate 253
- 15-8 Certificates 254
- Certificates 15-9 255
- 15.8 My Certificate Details 256
- Certificates 15-11 257
- 15-12 Certificates 258
- Certificates 15-13 259
- 15.9 Trusted CAs 260
- 15-18 Certificates 264
- Certificates 15-19 265
- 15-20 Certificates 266
- 15.12 Trusted Remote Hosts 267
- 15-26 Certificates 272
- Certificates 15-27 273
- 15-28 Certificates 274
- 15.16 Directory Servers 275
- Certificates 15-31 277
- Part VIII: 279
- Chapter 16 281
- Authentication Server 281
- 16-2 Authentication Server 282
- 16.4 Configuring RADIUS 283
- Authentication Server 16-5 285
- Table 16-2 RADIUS 285
- Chapter 17 287
- Remote Management Screens 287
- 17.2 Introduction to HTTPS 288
- 17.3 Configuring WWW 290
- Table 17-1 WWW 291
- 17.4 HTTPS Example 292
- 17.4.4 Login Screen 295
- 17.5 SSH Overview 299
- 17.6 How SSH works 300
- 17.8 Configuring SSH 301
- 17.9.2 Example 2: Linux 303
- 17.11 Telnet 305
- 17.12 Configuring TELNET 306
- 17.13 Configuring FTP 307
- 17.14 Configuring SNMP 308
- 17.14.1 Supported MIBs 310
- 17.14.2 SNMP Traps 310
- 17.15 Configuring DNS 312
- 17.16 Configuring Security 314
- Table 17-8 Security 315
- Chapter 18 317
- 18.2 UPnP Implementation 318
- 18.3 Configuring UPnP 318
- DESCRIPTION 319
- Part IX: 327
- Chapter 19 329
- Logs Screens 329
- 19-4 Log Screens 332
- Figure 19-2 Log Settings 332
- Log Screens 19-5 333
- Table 19-2 Log Settings 333
- 19.3 Configuring Reports 334
- 19.3.1 Viewing Web Site Hits 336
- 19.3.2 Viewing Protocol/Port 337
- Part X: 341
- Chapter 20 343
- Maintenance 343
- 20.3 DHCP Table Screen 346
- 20.4 F/W Upload Screen 347
- 20.5 Configuration Screen 349
- 20.5.1 Backup Configuration 350
- 20.6 Restart Screen 353
- Part XI: 355
- Chapter 21 357
- Introducing the SMT 357
- 21.2.2 Entering the Password 358
- 21.3.1 Main Menu 359
- Menu 15.2 361
- Port Forwarding Setup 361
- Menu 24.2.2 361
- System Maintenance 361
- Change Console Port Speed 361
- Chapter 22 363
- SMT Menu 1 - General Setup 363
- Chapter 23 367
- WAN and Dial Backup Setup 367
- 23.2 Dial Backup 368
- 23.4 Advanced WAN Setup 369
- 23.6 Editing PPP Options 374
- 23.7 Editing TCP/IP Options 375
- 23.8 Editing Login Script 377
- 23.9 Remote Node Filter 378
- Chapter 24 381
- LAN Setup 381
- 2. TCP/IP and DHCP Setup 382
- 24.4.1 IP Alias Setup 384
- IP Alias 1, 2 385
- 24.5 Wireless LAN Setup 386
- Chapter 25 391
- Internet Access 391
- 25-2 Internet Access 392
- 25.3 PPTP Encapsulation 393
- 25.4 PPPoE Encapsulation 394
- 25.5 Basic Setup Complete 395
- Part XII: 397
- Chapter 26 399
- Remote Node Setup 399
- 26.2.2 PPPoE Encapsulation 401
- Nailed-Up Connection 402
- 26.2.3 PPTP Encapsulation 404
- 26.3 Edit IP 405
- 26-8 Remote Node Setup 406
- 26.4 Remote Node Filter 407
- 26.5 Traffic Redirect 408
- 26-12 Remote Node Setup 410
- Remote Node Setup 26-13 411
- Chapter 27 413
- IP Static Route Setup 413
- Chapter 28 415
- 28.2 NAT Setup 417
- 28.2.1 Address Mapping Sets 418
- Ordering Your Rules 420
- 28.4 General NAT Examples 423
- 28.4.1 Internet Access Only 424
- 192.168.1.10 427
- 10.132.50.1 427
- 192.168.1.12 430
- 10.132.20.3 430
- Chapter 29 435
- Introducing the Firewall 435
- Active: Yes 436
- Chapter 30 437
- Filter Configuration 437
- Filter Structure 438
- Filter Rule 439
- Filter Set 439
- 1. Filter Setup 440
- Len Length 442
- 30-8 Filter Configuration 444
- Filter Configuration 30-9 445
- 30-10 Filter Configuration 446
- FIELD DESCRIPTION OPTIONS 447
- 30-12 Filter Configuration 448
- 30.3 Example Filter 449
- 30.4 Filter Types and NAT 452
- 30.6 Applying a Filter 453
- Chapter 31 455
- SNMP Configuration 455
- 31.2 SNMP Traps 456
- Part XIII: 457
- Chapter 32 459
- FIELD DESCRIPTION 460
- 32.3.1 System Information 462
- 32.4 Log and Trace 463
- 32.4.1 UNIX Syslog 464
- PARAMETER DESCRIPTION 465
- 32.4.3 Diagnostic 467
- 32.4.4 WAN DHCP 468
- Chapter 33 471
- 33.3 Backup Configuration 472
- 33.3.1 Backup Configuration 473
- 33.3.4 GUI-based FTP Clients 474
- 33.3.7 TFTP Command Example 476
- Choose the Xmodem protocol 477
- Then click Receive 477
- 33.4 Restore Configuration 478
- Then click Send 480
- 33.5.1 Firmware File Upload 481
- 33.5.5 TFTP File Upload 483
- ZyWALL 2 User’s Guide 488
- Chapter 34 489
- 34.1.1 Command Syntax 490
- 34.1.2 Command Usage 490
- 34.2 Call Control Support 491
- 34.2.2 Call History 492
- 34.3 Time and Date Setting 493
- 10. Time and Date Setting 494
- 34.3.1 Resetting the Time 495
- Chapter 35 497
- Remote Management 497
- FIELD DESCRIPTION EXAMPLE 499
- Part XIV: 501
- Chapter 36 503
- Call Scheduling 503
- Chapter 37 507
- VPN/IPSec Setup 507
- 37.2 IPSec Summary Screen 508
- VPN/IPSec Setup 37-3 509
- 37-4 VPN/IPSec Setup 510
- 37.3 IPSec Setup 511
- VPN/IPSec Setup 37-7 513
- 37-8 VPN/IPSec Setup 514
- VPN/IPSec Setup 37-9 515
- 37-10 VPN/IPSec Setup 516
- 37.4 IKE Setup 517
- VPN/IPSec Setup 37-13 519
- 37.5 Manual Setup 520
- 37-16 VPN/IPSec Setup 522
- Chapter 38 523
- SA Monitor 523
- 38-2 SA Monitor 524
- Part XV: 525
- Appendix A 527
- Troubleshooting 527
- Appendix B 531
- Windows 2000/NT/XP 534
- Appendix C 543
- Triangle Route 543
- Appendix D 547
- Appendix E 551
- Client computer 552
- Appendix F 553
- Types of EAP Authentication 553
- Appendix G 555
- Appendix H 557
- Call Connection 558
- PPP Data Connection 559
- Appendix I 561
- IP Subnetting 561
- I-8 IP Subnetting 568
- Appendix J 569
- Part XVI: 571
- Appendix K 573
- Command Interpreter 573
- Appendix L 575
- Firewall Commands 575
- L-2 Firewall Commands 576
- Chart L-1 Firewall Commands 576
- Firewall Commands L-3 577
- L-4 Firewall Commands 578
- Firewall Commands L-5 579
- L-6 Firewall Commands 580
- Appendix M 581
- NetBIOS Filter Commands 581
- Command: 583
- Appendix N 585
- Boot Commands 585
- Appendix O 587
- Log Descriptions 587
- Log Descriptions O-13 599
- Displaying Logs 603
- Appendix P 605
- Protection 605
- Appendix Q 607
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