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P312 Broadband Security Gateway
NAT 6-19
6.4.4 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-to-Many No Overload mapping as port numbers do not change for Many-to-Many
No Overload (and One-to-One) NAT mapping types. The following figure illustrates this.
Figure 6-21 NAT Example 4
Other applications, e.g., gaming programs are NAT unfriendly because they embed
addressing information in the data stream. These applications still won’t work
through NAT even when using One-to-One and Many-to-Many No Overload mapping
types.
Follow the steps outlined in example 3 above to configure these two menus as follows.
- Prestige 312 1
- FCC Statement iii 3
- Canadian Users 4
- Customer Support 8
- Table of Contents 9
- List of Figures 16
- List Of Tables 23
- Part I: 29
- Chapter 1 31
- Getting to Know Your Prestige 31
- Chapter 2 35
- 2.4 Housing 38
- 2.5 Power Up Your Prestige 38
- Enter Password : XXXX 39
- 2.6.1 Main Menu 40
- 2.7.1 Resetting the Prestige 41
- 2.8 General Setup 42
- 2.9 WAN Setup 44
- 2.10 LAN Setup 45
- 2.10.1 LAN Port Filter Setup 46
- Chapter 3 47
- Internet Access 47
- 3.1.3 Private IP Addresses 48
- 3.1.4 RIP Setup 48
- 3.1.5 DHCP Configuration 49
- 3.1.6 IP Multicast 49
- 3.1.7 IP Alias 50
- 3.2.1 IP Alias Setup 53
- 3.3 Internet Access Setup 54
- 3.3.2 PPTP Encapsulation 55
- 3.3.4 PPPoE Encapsulation 56
- 3.4 Basic Setup Complete 58
- Part II: 59
- Chapter 4 60
- Remote Node Setup 60
- 4-2 Remote Node Setup 61
- 4.1.2 PPPoE Encapsulation 62
- 4.1.3 PPTP Encapsulation 63
- Remote Node Setup 4-5 64
- 4-8 Remote Node Setup 67
- 4.3 Remote Node Filter 68
- 4-10 Remote Node Setup 69
- Chapter 5 70
- IP Static Route Setup 70
- 5.1 IP Static Route Setup 71
- IP Static Route Setup 5-3 72
- Chapter 6 74
- 6.1.3 How NAT works 75
- 6.1.4 NAT Mapping Types 75
- 6.2 SMT Menus 77
- 6.2.2 Configuring NAT 79
- 6.3 NAT Server Sets 84
- 6.4 Examples 86
- 6-20 NAT 93
- Part III: 94
- Chapter 7 96
- Filter Configuration 96
- Filter Rule 98
- Filter Set 98
- 7.2 Configuring a Filter Set 99
- Filters 7-5 100
- 7.2.3 TCP/IP Filter Rule 102
- 7-8 Filters 103
- Filters 7-9 104
- 7-10 Filters 105
- Filters 7-11 106
- 7.2.4 Generic Filter Rule 107
- Filters 7-13 108
- 7.3 Example Filter 109
- 7.4 Filter Types and NAT 111
- 7.5 Firewall 112
- 7.6.2 Remote Node Filters 113
- Chapter 8 114
- SNMP Configuration 114
- 8-2 SNMP 115
- Chapter 9 116
- 9.1 System Status 117
- 9.2.1 System Information 119
- 9.3 Log and Trace 120
- 9.3.1 Viewing Error Log 121
- 9.3.2 UNIX Syslog 121
- 2. Packet triggered 123
- 3. Filter log 123
- 4. PPP log 124
- 5. Firewall log 124
- 9.4 Diagnostic 125
- 9.4.1 WAN DHCP 126
- Chapter 10 128
- Transferring Files 128
- 10.2 Backup Configuration 129
- 10.3 Restore Configuration 130
- 10.4 Upload Firmware 130
- 10.5 TFTP File Transfer 132
- 10.5.1 Example TFTP Command 133
- 10.6 FTP File Transfer 134
- Chapter 11 138
- 11.2 Call Control Support 139
- 11.2.2 Call History 140
- 11.3 Time and Date Setting 141
- 11.4 Remote Management Setup 143
- 11.5 Boot Commands 144
- Chapter 12 146
- 12.3.2 System Timeout 147
- Part IV: 148
- Chapter 13 149
- What is a Firewall 149
- 13.3 Denial of Service 151
- 13.3.2 Types of DoS attacks 152
- 13.4 Stateful Inspection 154
- 13.4.3 TCP Security 156
- 13.4.4 UDP/ICMP Security 157
- 13.4.5 Upper Layer Protocols 157
- 13.5.1 Security In General 158
- What Is a Firewall? 13-11 159
- Chapter 14 161
- 14.1.1 View Firewall Log 162
- 14.1.2 Attack Types 162
- 14.3.1 Packet Filtering: 166
- 14.3.2 Firewall: 167
- Chapter 15 169
- 15.2 Enabling the Firewall 170
- 15.3 E-Mail 171
- 15.3.2 What are Logs? 172
- Table 15-1 E-Mail 173
- Figure 15-5 173
- 15.3.3 SMTP Error Messages 174
- 15.3.4 Example E-Mail Log 174
- 15.4 Attack Alert 175
- 15.4.1 Threshold Values: 176
- 15.4.2 Half-Open Sessions 176
- Table 15-3 Attack Alert 178
- Chapter 16 181
- Creating Custom Rules 181
- 16.2.2 Security Ramifications 182
- 16.3 Connection Direction 183
- 16.4 Services Supported 184
- Creating Custom Rules 16-5 185
- Table 16-1 Services Supported 185
- 16.5 Rule Summary 186
- Creating Custom Rules 16-7 187
- Table 16-1 187
- 16-8 Creating Custom Rules 188
- Creating Custom Rules 16-9 189
- 16-10 Creating Custom Rules 190
- Creating Custom Rules 16-11 191
- 16.6 Timeout 192
- Creating Custom Rules 16-13 193
- Figure 16-6 Timeout Screen 193
- 16-14 Creating Custom Rules 194
- Table 16-5 Timeout Menu 194
- Chapter 17 195
- Custom Ports 195
- 17-2 Custom Ports 196
- Table 17-1 Custom Ports 196
- Custom Ports 17-3 197
- 17-4 Custom Ports 198
- Chapter 18 199
- 18-2 Logs 200
- Table 18-1 Log Screen 200
- Logs 18-3 201
- Chapter 19 203
- Example Firewall Rules 203
- Internet 213
- Chapter 20 217
- Content Filtering 217
- 20.2 Blocking URLs 218
- Content Filtering 20-3 219
- Part V: 220
- Chapter 21 222
- Troubleshooting 222
- 21-2 Troubleshooting 223
- Troubleshooting 21-3 224
- Appendix A 226
- Appendix B 228
- Call Connection 229
- PPP Data Connection 229
- Appendix C 230
- Hardware Specifications 230
- Appendix D 231
- Important Safety Instructions 231
- Appendix E 232
- Firewall CLI Commands 232
- L CLI Commands 233
- CLI Commands M 234
- N CLI Commands 235
- CLI Commands O 236
- Appendix F 237
- Power Adapter Specs 237
- Glossary of Terms 239
- Glossary S 240
- T Glossary 241
- Glossary U 242
- V Glossary 243
- Glossary W 244
- X Glossary 245
- Glossary Y 246
- Z Glossary 247
- Glossary AA 248
- Index CC 250
- DD Index 251
- Index EE 252
- FF Index 253
- Index GG 254
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