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ZyWALL USG 100/200 Series User’s Guide
325
CHAPTER 18
ALG
18.1 ALG Overview
Application Layer Gateway (ALG) allows the following applications to operate properly
through the ZyWALL’s NAT.
• FTP - File Transfer Protocol (FTP) is an Internet file transfer service.
• SIP - Session Initiation Protocol (SIP) is an application-layer protocol that can be used to
create voice and multimedia sessions over Internet.
• H.323 - This is a teleconferencing protocol suite that provides audio, data and video
conferencing.
The following example shows SIP signaling (1) and audio (2) sessions between SIP clients A
and B and the SIP server.
Figure 232 SIP ALG Example
The ZyWALL only needs to use the ALG feature for traffic that goes through the ZyWALL’s
NAT.
18.1.1 What You Can Do in the ALG Screen
Use the ALG screen (Section 18.2 on page 328) to set up SIP, H.323, and FTP ALG settings.
- ZyWALL USG 100/200 1
- About This User's Guide 3
- Document Conventions 5
- Icons Used in Figures 6
- Safety Warnings 7
- Contents Overview 9
- Table of Contents 11
- Chapter 4 12
- Chapter 5 12
- Chapter 6 13
- Chapter 7 14
- Chapter 11 16
- Chapter 12 16
- Chapter 28 21
- Chapter 29 21
- Chapter 34 23
- Chapter 35 23
- Chapter 43 26
- List of Figures 29
- List of Tables 43
- Getting Started 51
- CHAPTER 1 53
- 1.3 Management Overview 54
- CHAPTER 2 57
- 2.2 Packet Flow 59
- 2.3 Applications 60
- 2.3.5 Device HA 63
- CHAPTER 3 65
- Chapter 3 Web Configurator 66
- Figure 10 Login Screen 66
- 3.3.1 Title Bar 67
- 3.3.2 Navigation Panel 68
- Chapter 3 Web Configurator 69
- 3.3.3 Main Window 72
- 3.3.4 Message Bar 72
- Figure 14 Warning Messages 73
- Figure 15 CLI Messages 73
- CHAPTER 4 75
- 4.3 Step 1 Internet Access 77
- Device Registration 91
- 4.6 VPN Setup 94
- 4.7 VPN Wizards 95
- 4.8.4 VPN Advanced Wizard 100
- Chapter 4 Wizard Setup 101
- Chapter 4 Wizard Setup 102
- CHAPTER 5 109
- 5.2.1 Interface Types 110
- WAN OPT LAN1 WLAN DMZ 110
- 5.4.1 Feature 113
- 5.4.2 Interface 114
- 5.4.3 Trunks 114
- 5.4.4 IPSec VPN 114
- 5.4.5 SSL VPN 115
- 5.4.6 L2TP VPN 115
- 5.4.7 Zones 115
- 5.4.8 Device HA 115
- 5.4.9 DDNS 116
- 5.4.10 Policy Routes 116
- 5.4.11 Static Routes 117
- 5.4.12 Firewall 117
- 5.4.13 Application Patrol 118
- 5.4.14 Anti-Virus 118
- 5.4.15 IDP 118
- 5.4.16 ADP 119
- 5.4.17 Content Filter 119
- 5.4.18 Anti-Spam 119
- 5.4.20 HTTP Redirect 120
- 5.4.21 ALG 120
- 5.5 Objects 121
- 5.6.2 File Manager 122
- 5.6.3 Licensing Registration 123
- 5.6.4 Licensing Update 123
- 5.6.5 Logs and Reports 123
- 5.6.6 Diagnostics 123
- CHAPTER 6 125
- Chapter 6 Tutorials 126
- Chapter 6 Tutorials 127
- Figure 53 Status 131
- 6 Click Activate Now 136
- 5 Click Networks > Add 139
- 2 Click Import 141
- Figure 78 VPN Example 144
- Figure 98 Firewall > Add 154
- Figure 99 Trunk Example 154
- Figure 102 System > WWW 157
- 6 Click Apply 158
- 6.8.1 How to Turn On the ALG 160
- 6.9 How to Use Device HA 162
- 6.9.1 Before You Start 163
- CHAPTER 7 171
- Chapter 7 Status 172
- Figure 127 Status 172
- Table 32 Status 172
- Chapter 7 Status 173
- Table 32 Status (continued) 173
- 7.2.1 The CPU Usage Screen 175
- 7.2.4 The VPN Status Screen 178
- 7.2.5 The DHCP Table Screen 179
- CHAPTER 8 185
- 8.2 The Registration Screen 186
- Chapter 8 Registration 187
- Chapter 8 Registration 188
- 8.3 The Service Screen 189
- CHAPTER 9 191
- Chapter 9 Signature Update 192
- Chapter 9 Signature Update 193
- CHAPTER 10 199
- Chapter 10 Interface 200
- Chapter 10 Interface 201
- 10.3 The Port Role Screen 205
- 10.5 Interface Wizards 214
- 10.8 Cellular Status Screen 231
- 10.9.1 WLAN Add/Edit Screen 235
- 10.12 VLAN Interface Screen 247
- Figure 180 Bridge Example 255
- ATZ is the most 263
- CHAPTER 11 269
- Chapter 11 Trunks 270
- Figure 187 Link Sticking 270
- Chapter 11 Trunks 271
- CHAPTER 12 277
- 12.2 Policy Route Screen 279
- 12.3 IP Static Route Screen 283
- NAT and SNAT 285
- Port Triggering 285
- Maximize Bandwidth Usage 286
- CHAPTER 13 287
- 13.2 The RIP Screen 288
- 13.3 The OSPF Screen 289
- Chapter 13 Routing Protocols 290
- Chapter 13 Routing Protocols 291
- CHAPTER 14 299
- 14.2 The Zone Screen 300
- 14.2.1 The Zone Edit Screen 301
- Chapter 14 Zones 302
- CHAPTER 15 303
- 15.2 The DDNS Screen 304
- Chapter 15 DDNS 305
- DDNS server 306
- 15.3 The DDNS Status Screen 307
- Chapter 15 DDNS 308
- CHAPTER 16 309
- Chapter 16 Virtual Servers 310
- It can 311
- NAT 1:1 Example 313
- NAT 1:1 Address Objects 314
- NAT 1:1 Virtual Server 314
- NAT 1:1 Policy Route 315
- NAT 1:1 Firewall Rule 316
- NAT Loopback Example 317
- NAT Loopback Virtual Server 318
- NAT Loopback Policy Route 319
- CHAPTER 17 321
- Chapter 17 HTTP Redirect 322
- Chapter 17 HTTP Redirect 323
- CHAPTER 18 325
- Chapter 18 ALG 326
- Chapter 18 ALG 327
- 18.2 The ALG Screen 328
- Table 108 Network > ALG 329
- 18.3 ALG Technical Reference 330
- PART III 333
- CHAPTER 19 335
- Chapter 19 Firewall 336
- Chapter 19 Firewall 337
- 19.2 The Firewall Screen 343
- Figure 247 Firewall 344
- Table 113 Firewall 344
- CHAPTER 20 351
- 20.1.3 Before You Begin 352
- Chapter 20 IPSec VPN 353
- Chapter 20 IPSec VPN 354
- 1234567890XYZ for a DES 362
- 20.3 The VPN Gateway Screen 363
- 20.5 The SA Monitor Screen 371
- IKE SA Overview 373
- Authentication 375
- Additional Topics for IKE SA 376
- Figure 264 VPN/NAT Example 377
- IPSec SA Overview 379
- CHAPTER 21 385
- Chapter 21 SSL VPN 386
- Table 125 Objects 386
- Chapter 21 SSL VPN 387
- CHAPTER 22 395
- 22.2 Remote User Login 396
- Chapter 22 SSL User Screens 397
- Figure 278 Login Screen 397
- Chapter 22 SSL User Screens 398
- 22.4 Bookmarking the ZyWALL 399
- CHAPTER 23 401
- CHAPTER 24 403
- Figure 286 File Sharing 404
- 24.3.1 Downloading a File 405
- 24.3.2 Saving a File 405
- 24.4 Creating a New Folder 406
- 24.7 Uploading a File 408
- CHAPTER 25 409
- Chapter 25 L2TP VPN 410
- 25.2 L2TP VPN Screen 411
- Chapter 25 L2TP VPN 413
- CHAPTER 26 415
- Chapter 26 L2TP VPN Example 416
- Chapter 26 L2TP VPN Example 417
- 172.16.1.2 422
- 12 Click IPSec Settings 423
- Click OK 424
- Figure 321 Registry Key 426
- Figure 322 New DWORD Value 426
- Figure 324 Run mmc 427
- 12 Click Add 431
- 6 Click Properties 437
- Application Patrol 441
- CHAPTER 27 443
- Chapter 27 Application Patrol 444
- Figure 364 Application Edit 454
- Table 139 Application Edit 454
- CHAPTER 28 469
- Chapter 28 Anti-Virus 470
- 28.1.3 Before You Begin 471
- Chapter 28 Anti-Virus 473
- 28.3 Anti-Virus Black List 475
- 28.5 Anti-Virus White List 477
- 28.6 Signature Searching 478
- CHAPTER 29 483
- 29.2 The IDP General Screen 484
- Chapter 29 IDP 485
- Chapter 29 IDP 486
- 29.3.1 Base Profiles 487
- • Add a new profile 488
- • Edit an existing profile 488
- • Delete an existing profile 488
- 29.5 Creating New Profiles 489
- 29.6.2 Policy Types 493
- 29.6.3 IDP Service Groups 494
- 29.6.5 Query Example 497
- 29.7.1 IP Packet Header 498
- number. Select 503
- 29.9 IDP Technical Reference 509
- fragoffset 510
- CHAPTER 30 513
- 30.2 The ADP General Screen 514
- Chapter 30 ADP 515
- 30.3.1 Base Profiles 516
- Table 166 Base Profiles 517
- Chapter 30 ADP 518
- 30.4 Technical Reference 523
- Flood Detection 525
- Figure 404 SYN Flood 526
- Section 30.3.5 on page 520) 527
- CHAPTER 31 531
- 31.1.3 Before You Begin 532
- Chapter 31 Content Filtering 533
- Chapter 31 Content Filtering 534
- _), or dashes (-), but the 537
- _), or dashes (-), but 544
- CHAPTER 32 551
- Figure 415 Blue Coat: Login 553
- 32.3 Web Site Submission 556
- CHAPTER 33 559
- Chapter 33 Anti-Spam 560
- 33.2 Before You Begin 561
- Chapter 33 Anti-Spam 563
- 33.6 The DNSBL Screen 568
- PART VII 573
- CHAPTER 34 575
- 34.2 Device HA General 576
- Chapter 34 Device HA 577
- Chapter 34 Device HA 578
- Figure 432 Virtual Router 578
- 34.5 The Legacy Mode Screen 583
- Synchronization 588
- PART VIII 591
- CHAPTER 35 593
- Chapter 35 User/Group 594
- 35.2 User Summary Screen 595
- 35.2.1 User Add/Edit Screen 596
- 35.3.1 Group Add/Edit Screen 598
- 35.4 Setting Screen 599
- Chapter 35 User/Group 601
- CHAPTER 36 607
- Chapter 36 Addresses 608
- Chapter 36 Addresses 609
- CHAPTER 37 613
- Chapter 37 Services 614
- Add icon or an Edit icon 615
- Chapter 37 Services 617
- CHAPTER 38 619
- Chapter 38 Schedules 620
- Chapter 38 Schedules 621
- CHAPTER 39 625
- 39.1.3 ASAS 626
- Chapter 39 AAA Server 629
- Chapter 39 AAA Server 632
- CHAPTER 40 635
- CHAPTER 41 639
- Chapter 41 Certificates 640
- Chapter 41 Certificates 641
- characters 644
- CHAPTER 42 657
- Chapter 42 SSL Application 658
- Chapter 42 SSL Application 659
- System (665) 663
- CHAPTER 43 665
- 43.2 Host Name 666
- 43.3 Date and Time 666
- Chapter 43 System 667
- Chapter 43 System 668
- 43.4 Console Port Speed 670
- 43.5 DNS Overview 670
- Figure 490 System > DNS 671
- Table 233 System > DNS 671
- 43.5.3 Address Record 673
- 43.5.4 PTR Record 673
- 43.5.8 MX Record 675
- 43.5.9 Adding a MX Record 675
- 43.6 WWW Overview 676
- 43.6.2 System Timeout 677
- 43.6.3 HTTPS 678
- 43.6.4 Configuring WWW 679
- 43.6.5 Service Control Rules 681
- 43.6.6 HTTPS Example 682
- 43.7 SSH 689
- 43.7.1 How SSH Works 690
- 43.7.4 Configuring SSH 691
- 43.8 Telnet 693
- 43.9 FTP 694
- 43.9.1 Configuring FTP 695
- 43.10 SNMP 696
- 43.10.1 Supported MIBs 697
- 43.10.2 SNMP Traps 697
- 43.10.3 Configuring SNMP 698
- 43.11 Dial-in Management 699
- 43.12 Vantage CNM 700
- Note: HTTPS is recommended 701
- 43.13 Language Screen 702
- Maintenance 703
- Troubleshooting, & 703
- Specifications 703
- CHAPTER 44 705
- Chapter 44 File Manager 706
- Chapter 44 File Manager 707
- CHAPTER 45 715
- Chapter 45 Logs 716
- 45.4 Log Setting Screens 717
- 45.4.1 Log Setting Summary 718
- Chapter 45 Logs 719
- CHAPTER 46 727
- Chapter 46 Reports 728
- Chapter 46 Reports 729
- 46.3 The Session Screen 730
- 46.5 The IDP Report Screen 733
- CHAPTER 47 741
- Chapter 47 Diagnostics 742
- CHAPTER 48 743
- Chapter 48 Reboot 744
- CHAPTER 49 745
- VPN tunnel 746
- Chapter 49 Troubleshooting 747
- 49.1 Resetting the ZyWALL 748
- CHAPTER 50 749
- Appendices and 757
- APPENDIX A 759
- Appendix A Log Descriptions 760
- Table 279 Anti-Spam Logs 760
- Appendix A Log Descriptions 761
- Table 280 SSL VPN Logs 762
- Table 282 ZySH Logs 766
- Table 283 ADP Logs 768
- Table 284 Anti-Virus Logs 768
- Table 285 User Logs 771
- Table 286 myZyXEL.com Logs 772
- Table 287 IDP Logs 777
- Table 289 IKE Logs 782
- Table 290 IPSec Logs 786
- Table 291 Firewall Logs 786
- Table 293 Policy Route Logs 787
- Table 295 System Logs 791
- Table 297 Device HA Logs 797
- Table 299 NAT Logs 802
- Table 300 PKI Logs 803
- Table 301 Interface Logs 805
- Table 302 WLAN Logs 809
- Table 303 Account Logs 811
- Table 306 File Manager Logs 812
- APPENDIX B 815
- Appendix B Common Services 816
- Appendix B Common Services 817
- APPENDIX C 819
- Windows 2000 820
- Windows 98 SE/Me 821
- APPENDIX D 825
- Figure 568 Login Screen 826
- APPENDIX E 831
- Appendix E Wireless LANs 832
- Appendix E Wireless LANs 833
- Fragmentation Threshold 834
- Preamble Type 835
- IEEE 802.11g Wireless LAN 835
- Wireless Security Overview 835
- IEEE 802.1x 836
- Types of EAP Authentication 837
- PEAP (Protected EAP) 838
- Dynamic WEP Key Exchange 839
- WPA and WPA2 839
- Encryption 840
- User Authentication 840
- Security Parameters Summary 842
- Antenna Overview 843
- Antenna Characteristics 843
- Types of Antennas for WLAN 843
- Positioning Antennas 844
- APPENDIX F 845
- Netkit Telnet License 846
- NTP License 846
- Expat License 847
- OpenSSL License 848
- Original SSLeay License 849
- ISC license 851
- Apache License 852
- The MIT License 867
- APPENDIX G 873
- ZyXEL Limited Warranty 875
- Appendix G Legal Information 876
- APPENDIX H 877
- Appendix H Customer Support 878
- Appendix H Customer Support 879
- Numerics 883
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