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ZyWALL 100 Internet Security Gateway
NAT 12-23
12.5.4 Example 4: NAT Unfriendly Application Programs
Some applications do not support NAT Mapping using TCP or UDP port address translation. In this case it
is better to use Many-One-to-One mapping as port numbers do not change for Many-One-to-One (and
One-to-One) NAT mapping types. The following figure illustrates this.
Figure 12-21 NAT Example 4
Other applications such as some gaming programs are NAT unfriendly because
they embed addressing information in the data stream. These applications won’t
work through NAT even when using One-to-One and Many-One-to-One mapping
types.
Follow the steps outlined in example 3 above to configure these two menus as follows.
- ZyWALL 100 1
- Copyright 2
- Interference Statement 3
- ZyXEL Limited Warranty 5
- Customer Support 6
- Table of Contents 7
- List of Figures 14
- List of Diagrams 21
- List of Tables 22
- Preface 26
- Part I: 28
- Chapter 1 30
- Getting to Know Your ZyWALL 30
- 1.4.2 VPN Application 36
- Chapter 2 38
- Hardware Installation 38
- 2-2 Hardware Installation 39
- UPLINK button “off” (out) 41
- Chapter 3 42
- Initial Setup 42
- Enter Password : XXXX 43
- 3.2.1 Main Menu 44
- 3-4 Initial Setup 45
- Initial Setup 3-5 46
- 3-6 Initial Setup 47
- 3.4 Resetting the ZyWALL 49
- Chapter 4 50
- SMT Menu 1 - General Setup 50
- 4.3 General Setup 51
- Chapter 5 54
- WAN Setup 54
- 5.4 Advanced WAN Setup 56
- 5.4.3 Response Strings 57
- WAN Setup 5-5 58
- Chapter 6 60
- LAN Setup 60
- 6.3 TCP/IP and LAN DHCP 61
- Private IP Addresses 62
- 6.3.4 RIP Setup 63
- 6.3.5 IP Multicast 63
- 6.3.6 IP Alias 64
- 6.4.1 IP Alias Setup 67
- 6.5 Wireless LAN Setup 69
- LAN Setup 6-13 72
- Chapter 7 74
- DMZ Setup 74
- 7.3 TCP/IP Setup 75
- 7.3.2 IP Alias Setup 76
- Chapter 8 78
- Internet Access 78
- 8.1.2 PPTP Encapsulation 79
- 8.1.4 PPPoE Encapsulation 80
- 8.2 Basic Setup Complete 82
- Part II: 83
- Chapter 9 84
- Remote Node Setup 84
- 9.2 Remote Node Profile 85
- Remote Node Setup 9-3 86
- 9.2.2 PPPoE Encapsulation 87
- 9.2.3 PPTP Encapsulation 89
- Remote Node Setup 9-9 92
- 9.4 Remote Node Filter 95
- 9.5 Traffic Redirect 96
- 9-16 Remote Node Setup 99
- Chapter 10 100
- Backup Remote Node Setup 100
- 10.2 Editing PPP Options 102
- 10.3 Editing TCP/IP Options 104
- 10.4 Editing Login Script 105
- 10.5 Remote Node Filter 107
- Chapter 11 110
- IP Static Route Setup 110
- 11.1 IP Static Route Setup 111
- IP Static Route Setup 11-3 112
- Chapter 12 114
- 12.1.2 What NAT Does 115
- 12.1.3 How NAT Works 115
- NAT 12-3 116
- Figure 12-1 How NAT Works 116
- 12.1.4 NAT Application 117
- 12.1.5 NAT Mapping Types 117
- 12.2 Using NAT 119
- 12.3 NAT Setup 121
- 12.3.1 Address Mapping Sets 122
- 12.5 General NAT Examples 130
- Part III: 141
- Chapter 13 143
- Firewalls 143
- 13.4 Denial of Service 145
- 13.4.2 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
- 13.5 Stateful Inspection 149
- 13.5.3 TCP Security 152
- 13.5.4 UDP/ICMP Security 152
- 13.5.5 Upper Layer Protocols 153
- 13.6.1 Security In General 154
- 13.7.1 Packet Filtering: 155
- 13.7.2 Firewall 155
- Chapter 14 157
- Chapter 15 161
- 15.3 E-mail 162
- 15.3.2 Logs 163
- Table 15-1 E-mail 164
- 15.3.3 SMTP Error Messages 165
- 15.3.4 Example E-mail Log 165
- 15.4 Attack Alert 166
- 15.4.2 Half-Open Sessions 167
- Chapter 16 171
- Creating Custom Rules 171
- 16.2 Rule Logic Overview 172
- 16.3.1 LAN to WAN Rules 173
- 16.3.2 WAN to LAN Rules 174
- 16.4 Rule Summary 175
- 16.5 Predefined Services 177
- 16.6 Custom Ports 184
- Select WAN to LAN from the 186
- Chapter 17 191
- 17-2 Logs 192
- Table 17-1 Log Screen 192
- Chapter 18 193
- Content Filtering 193
- 18.4 Customizing 194
- 18.5 Keywords 194
- 18.6 Logs 194
- Part IV: 195
- Chapter 19 196
- Filter Configuration 196
- Outgoing 197
- Filter Rule 198
- Filter Set 198
- 19.2.2 TCP/IP Filter Rule 201
- 19-8 Filter Configuration 203
- Filter Configuration 19-9 204
- 19-10 Filter Configuration 205
- 19.2.3 Generic Filter Rule 206
- 19-12 Filter Configuration 207
- 19.3 Example Filter 208
- 19.4 Filter Types and NAT 211
- 19.5 Firewall 211
- 19.6.1 LAN Filters 212
- 19.6.2 DMZ Filters 212
- 19.6.3 Remote Node Filters 213
- Chapter 20 214
- SNMP Configuration 214
- 20.2 Supported MIBs 216
- 20.3 SNMP Configuration 216
- 20.4 SNMP Traps 217
- Chapter 21 218
- 1. System Information 220
- 2. Console Port Speed 220
- 21.2.1 System Information 221
- 21.3 Log and Trace 222
- 21.3.2 UNIX Syslog 223
- 4. PPP log 226
- 5. Firewall log 226
- 3. Filter log 226
- 21.4 Diagnostic 227
- 21.4.1 WAN DHCP 228
- Chapter 22 230
- Maintenance 230
- 22.2 Backup Configuration 231
- 22.2.1 Backup Configuration 232
- 22.2.4 GUI-based FTP Clients 233
- 22.2.7 TFTP Command Example 235
- 22.3 Restore Configuration 237
- 22.4.1 Firmware File Upload 241
- 22.4.5 TFTP File Upload 243
- Choose the Xmodem protocol 246
- Then click Send 246
- Chapter 23 250
- 23.2 Call Control Support 251
- 23.2.1 Budget Management 252
- 23.2.2 Call History 253
- 23.3 Time and Date Setting 254
- 23.3.1 Resetting the Time 256
- Chapter 24 258
- Remote Management 258
- 24.3 Web 259
- 24.4 SNMP 259
- 24.5 DNS 259
- 24.6 Remote Management 259
- Remote Management 24-3 260
- 24.8 System Timeout 261
- Part V: 262
- Chapter 25 264
- IP Policy Routing 264
- IP Policy Routing 25-5 268
- 25.5 Applying an IP Policy 269
- 25-10 IP Policy Routing 273
- Chapter 26 274
- Call Scheduling 274
- Call Scheduling 26-3 276
- Chapter 27 278
- Introduction to IPSec 278
- 27.1.5 VPN Applications 279
- 27.2 IPSec Architecture 280
- 27.2.1 IPSec Algorithms 281
- 27.2.2 Key Management 281
- 27.3 Encapsulation 282
- 27.4 IPSec and NAT 282
- Chapter 28 284
- VPN/IPSec Setup 284
- 28.2 IPSec Algorithms 285
- 28.3 IPSec Summary 286
- 28.3.1 My IP Address 287
- VPN/IPSec Setup 28-7 290
- 28-8 VPN/IPSec Setup 291
- 28.4 IPSec Setup 292
- 28-10 VPN/IPSec Setup 293
- VPN/IPSec Setup 28-11 294
- 28.5 IKE Setup 295
- 28.5.2 Negotiation Mode 296
- 28.5.3 Pre-Shared Key 297
- 28-16 VPN/IPSec Setup 299
- 28.6 Manual Setup 300
- VPN/IPSec Setup 28-19 302
- Chapter 29 304
- SA Monitor 304
- 29-2 SA Monitor 305
- Chapter 30 306
- IPSec Log 306
- IPSec Log 30-3 308
- IPSec Log 30-5 310
- Part VI: 311
- Chapter 31 313
- Troubleshooting 313
- 31-2 Troubleshooting 314
- Troubleshooting 31-3 315
- Appendix A 317
- The Big Picture 317
- Appendix B 318
- Appendix C 323
- Appendix D 325
- Call Connection 326
- PPP Data Connection 326
- PPTP K 327
- Appendix E 328
- Hardware Specifications 328
- Appendix F 330
- Appendix G 331
- Command Interpreter 331
- Appendix H 332
- Firewall Commands 332
- Firewall Commands Q 333
- R Firewall Commands 334
- Firewall Commands S 335
- T Firewall Commands 336
- Firewall Commands U 337
- V Firewall Commands 338
- Appendix I 339
- NetBIOS Filter Commands 339
- Appendix J 342
- Boot Commands 342
- Appendix K 344
- Index CC 345
- DD Index 346
- Index EE 347
- FF Index 348
- Index GG 349
- HH Index 350
- Index II 351
- JJ Index 352
- Index KK 353
- LL Index 354
- Index MM 355
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