Zyxel-communications ZYWALL10 Manual de usuario Pagina 175
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ZyWALL 10 Internet Security Gateway
14-6 Introducing the ZyWALL Firewall
Figure 14-5 Big Picture — Filtering, Firewall and NAT
14.3 Packet Filtering Vs Firewall
Below are some comparisons between the ZyWALL’s filtering and firewall functions.
14.3.1 Packet Filtering:
!
The router filters packets as they pass through the router’s interface according to the filter rules you
designed.
!
Packet filtering is a powerful tool, yet can be complex to configure and maintain, especially if you need
a chain of rules to filter a service.
!
Packet filtering only checks the header portion of an IP packet.
- ZyWALL 10 1
- Copyright 2
- (FCC) Interference Statement 3
- ZyXEL Limited Warranty 7
- Customer Support 8
- Table of Contents 9
- List of Figures 17
- List of Tables 23
- Part I: 29
- Chapter 1 31
- Getting to Know Your ZyWALL 31
- Chapter 2 35
- 2.4 Turn On Your ZyWALL 38
- Table 2-2 Main Menu Commands 39
- 2.5.1 Main Menu 40
- Table 2-3 Main Menu Summary 41
- 2.5.3 SMT Menus at a Glance 42
- 2.7 General Setup 43
- 2.7.1 Dynamic DNS 44
- 2.8 WAN Setup 46
- 2.9 LAN Setup 47
- 2.9.1 LAN Port Filter Setup 48
- Chapter 3 49
- Internet Access 49
- 3.1.4 Private IP Addresses 50
- 3.1.5 RIP Setup 51
- 3.1.6 IP Multicast 51
- 3.1.7 IP Alias 52
- 3-6 Internet Access 54
- 3.2.1 IP Alias Setup 55
- 3.3 Internet Access Setup 56
- Internet Access 3-9 57
- 3.3.2 PPTP Encapsulation 58
- 3.3.4 PPPoE Encapsulation 59
- 3.4 Basic Setup Complete 61
- Part II: 62
- Chapter 4 63
- Remote Node Setup 63
- 4-2 Remote Node Setup 64
- Table 4-1 Fields in Menu 11.1 64
- 4.1.2 PPPoE Encapsulation 65
- 4.1.3 PPTP Encapsulation 66
- Remote Node Setup 4-5 67
- 4-8 Remote Node Setup 70
- 4.3 Remote Node Filter 71
- 4-10 Remote Node Setup 72
- Chapter 5 73
- IP Static Route Setup 73
- 5.1 IP Static Route Setup 74
- IP Static Route Setup 5-3 75
- Chapter 6 77
- 6.1.3 How NAT works 78
- 6.1.4 NAT Mapping Types 79
- 6.1.6 NAT Application 80
- 6.2 SMT Menus 81
- 6.2.2 Configuring NAT 83
- 6.3 NAT Server Sets 88
- 1026 entry 90
- 6.4 Examples 91
- NAT 6-21 97
- Part III: 98
- Chapter 7 100
- Filter Configuration 100
- Filter Rule 102
- Filter Set 102
- 7.2 Configuring a Filter Set 103
- Filters 7-5 104
- 7.2.3 TCP/IP Filter Rule 106
- 7-8 Filters 107
- Filters 7-9 108
- 7-10 Filters 109
- 7.2.4 Generic Filter Rule 110
- 7-12 Filters 111
- 7.3 Example Filter 112
- 7.4 Filter Types and NAT 114
- 7.5 Firewall 115
- 7.6.2 Remote Node Filters 116
- Chapter 8 118
- SNMP Configuration 118
- 8-2 SNMP 119
- Chapter 9 120
- 1. System Information 122
- 2. Console Port Speed 122
- 9.2.1 System Information 123
- 9.3 Log and Trace 124
- 9.3.2 UNIX Syslog 125
- 2. Packet triggered 127
- 3. Filter log 127
- 4. PPP log 128
- 5. Firewall log 128
- 9.4 Diagnostic 129
- 9.4.1 WAN DHCP 130
- Chapter 10 132
- Maintenance 132
- 10.2 Backup Configuration 133
- 10.3 Restore Configuration 135
- 10.4 Upload Firmware 136
- 10.5 TFTP File Transfer 138
- 10.5.1 Example: TFTP Command 139
- 10.6 FTP File Transfer 140
- Chapter 11 144
- 11.2 Call Control Support 145
- 11.2.2 Call History 146
- 11.3 Time and Date Setting 147
- 11.4 Remote Management Setup 150
- 11.5 Boot Commands 151
- Chapter 12 154
- 12.3.2 System Timeout 155
- Part IV: 156
- Chapter 13 158
- What is a Firewall? 158
- 13.3 Denial of Service 160
- 13.3.2 Types of DoS attacks 161
- 13.4 Stateful Inspection 163
- 13.4.3 TCP Security 165
- 13.4.4 UDP/ICMP Security 166
- 13.4.5 Upper Layer Protocols 166
- 13.5.1 Security In General 167
- Chapter 14 170
- 14.1.1 View Firewall Log 171
- 14.1.2 Attack Types 171
- Table 14-4 View Firewall Log 174
- 14.3.1 Packet Filtering: 175
- 14.3.2 Firewall 176
- Chapter 15 178
- 15.2 Enabling the Firewall 180
- 15.3 E-mail 180
- 15.3.2 What are Logs? 181
- Table 15-1 E-mail 182
- 15.3.3 SMTP Error Messages 183
- 15.3.4 Example E-mail Log 183
- 15.4 Attack Alert 184
- 15.4.2 Half-Open Sessions 185
- Figure 15-6 Attack Alert 186
- Table 15-3 Attack Alert 187
- Chapter 16 190
- Creating Custom Rules 190
- 16.2.2 Security Ramifications 191
- 16.3 Connection Direction 192
- 16.4 Rule Summary 193
- Creating Custom Rules 16-5 194
- 16-6 Creating Custom Rules 195
- 16.5 Predefined Services 196
- 16-8 Creating Custom Rules 197
- Creating Custom Rules 16-9 198
- 16-10 Creating Custom Rules 199
- Creating Custom Rules 16-11 200
- Creating Custom Rules 16-13 202
- 16.6 Timeout 203
- Creating Custom Rules 16-15 204
- Table 16-5 Timeout Menu 204
- Chapter 17 206
- Custom Ports 206
- 17-2 Custom Ports 207
- Table 17-1 Custom Ports 207
- 17-4 Custom Ports 209
- Chapter 18 210
- 18-2 Example Firewall Rules 211
- Table 18-1 Log Screen 211
- Chapter 19 212
- Example Firewall Rules 212
- Internet 223
- Chapter 20 226
- Content Filtering 226
- 20-2 Content Filtering 227
- Figure 20-1 Categories Screen 227
- 20.2 Update List 228
- 20.3 Exempting Computers 229
- 20.4 Customizing 230
- 20.5 Keywords 231
- 20.6 Log Records 232
- Part V: 233
- Chapter 21 235
- Troubleshooting 235
- 21-2 Troubleshooting 236
- Troubleshooting 21-3 237
- Appendix A 239
- Appendix B 241
- Call Connection 242
- PPP Data Connection 242
- Appendix C 243
- Hardware Specifications 243
- Appendix D 244
- Important Safety Instructions 244
- Appendix E 245
- Firewall CLI Commands 245
- H CLI Commands 246
- CLI Commands I 247
- J CLI Commands 248
- CLI Commands K 249
- Appendix F 250
- Power Adapter Specifications 250
- Glossary of Terms 252
- Glossary of Terms O 253
- P Glossary of Terms 254
- Glossary of Terms Q 255
- R Glossary of Terms 256
- Glossary of Terms S 257
- T Glossary of Terms 258
- Glossary of Terms U 259
- V Glossary of Terms 260
- Glossary of Terms W 261
- Index AA 265
- BB Index 266
- Index CC 267
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