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Chapter 8 Firewalls
P-661H/HW Series User’s Guide
148
• To selectively block/allow inbound or outbound traffic between inside host/networks and
outside host/networks. Remember that filters can not distinguish traffic originating from
an inside host or an outside host by IP address.
• The firewall performs better than filtering if you need to check many rules.
• Use the firewall if you need routine e-mail reports about your system or need to be alerted
when attacks occur.
• The firewall can block specific URL traffic that might occur in the future. The URL can be
saved in an Access Control List (ACL) database.
- P-661H/HW Series 1
- About This User's Guide 3
- Document Conventions 4
- Icons Used in Figures 5
- Safety Warnings 6
- Safety Warnings 7
- Contents Overview 10
- P-661H/HW Series User’s Guide 10
- Table of Contents 11
- Chapter 3 12
- Chapter 4 12
- Chapter 5 13
- Chapter 6 13
- Chapter 7 14
- Chapter 8 14
- Chapter 9 15
- Chapter 10 15
- Chapter 11 16
- Chapter 12 16
- List of Figures 21
- List of Tables 27
- Introduction 31
- CHAPTER 1 33
- 1.2.2 LAN to LAN Application 34
- 1.5 Front Panel LEDs 35
- 1.6 Hardware Connection 36
- 1.7.2 Telephone Microfilters 37
- CHAPTER 2 39
- Figure 6 Password Screen 40
- Figure 8 Select a Mode 41
- 2.3.1 Using the Reset Button 42
- 2.4.1 Navigation Panel 42
- 2.4.2 Status Screen 45
- Table 4 Status Screen 46
- 2.4.3 Status: Any IP Table 47
- 2.4.5 Status: VPN Status 48
- Table 7 Status: VPN Status 49
- Figure 16 System General 52
- CHAPTER 3 53
- 3.1 Internet Setup Wizard 54
- 3.1.2.1 Screen 1 55
- 3.1.2.2 Screen 2 55
- 3.1.2.3 Screen 3 56
- Chapter 3 Wizards 57
- Chapter 3 Wizards 58
- 3.1.3 No DSL Detection 59
- 3.3.1 Screen 1 66
- 3.3.2 Screen 2 67
- 3.3.3 Screen 3 69
- WA N S e t u p ( 7 3) 71
- LAN Setup (89) 71
- Wireless LAN (101) 71
- CHAPTER 4 73
- 4.1.2 Multiplexing 74
- 4.1.3 VPI and VCI 74
- 4.1.4 IP Address Assignment 74
- 4.2 Metric 75
- 4.3 Traffic Shaping 76
- 4.3.1 ATM Traffic Classes 77
- 4.5 Internet Connection 78
- Chapter 4 WAN Setup 79
- Chapter 4 WAN Setup 80
- 4.6.1 More Connections Edit 82
- 4.7 Traffic Redirect 86
- The screen appears as shown 87
- Check WAN IP Address 88
- CHAPTER 5 89
- 5.1.2 DHCP Setup 90
- 5.1.3 DNS Server Address 90
- 5.2 LAN TCP/IP 91
- 5.2.2 RIP Setup 92
- 5.2.3 Multicast 92
- 5.2.4 Any IP 93
- 5.3 Configuring LAN IP 94
- Chapter 5 LAN Setup 95
- Table 30 LAN IP 95
- Table 31 Advanced LAN Setup 95
- 5.4 DHCP Setup 96
- Figure 50 DHCP Setup 97
- Table 32 DHCP Setup 97
- 5.5 LAN Client List 98
- 5.6 LAN IP Alias 99
- Chapter 5 LAN Setup 100
- Figure 53 LAN IP Alias 100
- Table 34 LAN IP Alias 100
- CHAPTER 6 101
- 6.2.3 User Authentication 102
- 6.2.1 SSID 102
- 6.2.2 MAC Address Filter 102
- 6.2.4 Encryption 103
- Device’s new settings 104
- 6.4.1 No Security 105
- 6.4.2 WEP Encryption 106
- 6.4.3 WPA-PSK/WPA2-PSK 107
- Chapter 6 Wireless LAN 108
- 6.4.4 WPA/WPA2 109
- ZyXEL Device is using 110
- Chapter 6 Wireless LAN 111
- 6.5 OTIST 112
- Table 42 OTIST 113
- 6.5.2 Starting OTIST 114
- 6.5.3 Notes on OTIST 115
- 6.6 MAC Filter 116
- 6.7 WMM QoS 117
- 6.7.3 Services 118
- 6.8 QoS Screen 119
- Figure 68 Wireless LAN: QoS 120
- Table 46 Wireless LAN: QoS 120
- CHAPTER 7 123
- 7.1.2 What NAT Does 124
- 7.1.3 How NAT Works 124
- 7.1.4 NAT Application 124
- 7.1.5 NAT Mapping Types 125
- 7.3 NAT General Setup 126
- 7.4 Port Forwarding 127
- Figure 74 Port Forwarding 130
- Table 52 Port Forwarding 130
- 7.6 Address Mapping 131
- PART III 135
- CHAPTER 8 137
- Chapter 8 Firewalls 138
- 8.4 Denial of Service 139
- 8.4.2 Types of DoS Attacks 140
- Chapter 8 Firewalls 141
- Figure 80 SYN Flood 141
- Figure 81 Smurf Attack 141
- 8.5 Stateful Inspection 142
- 8.5.3 TCP Security 144
- 8.5.4 UDP/ICMP Security 145
- 8.5.5 Upper Layer Protocols 145
- 8.6.1 Security In General 146
- 8.7.1 Packet Filtering: 147
- 8.7.2 Firewall 147
- CHAPTER 9 149
- 9.3 Rule Logic Overview 150
- 9.4 Connection Direction 151
- 9.5 Triangle Route 152
- Figure 85 IP Alias 153
- Figure 86 Firewall: General 154
- Table 60 Firewall: General 154
- 9.7 Firewall Rules Summary 155
- Figure 87 Firewall Rules 156
- Table 61 Firewall Rules 156
- 9.7.2 Customized Services 160
- 9.8 Example Firewall Rule 161
- 10.0.0.15 on the LAN 164
- 9.9 Anti Probing 165
- 9.10 DoS Thresholds 166
- 9.10.2 Half-Open Sessions 167
- CHAPTER 10 171
- Chapter 10 Content Filtering 172
- Chapter 10 Content Filtering 173
- CHAPTER 11 175
- 11.2 IPSec Architecture 176
- 11.3 Encapsulation 177
- 11.4 IPSec and NAT 178
- Table 70 VPN and NAT 179
- CHAPTER 12 181
- 12.3 My IP Address 182
- 12.4 Secure Gateway Address 182
- 12.5 VPN Setup Screen 183
- Chapter 12 VPN Screens 184
- Figure 105 VPN Setup 184
- Table 72 VPN Setup 184
- 12.6 Keep Alive 185
- 12.8 Remote DNS Server 186
- 12.9 ID Type and Content 187
- 12.10 Pre-Shared Key 188
- 12.11 Editing VPN Policies 188
- Chapter 12 VPN Screens 189
- Table 78 Edit VPN Policies 189
- 12.12 IKE Phases 193
- 12.12.1 Negotiation Mode 194
- 12.14 Manual Key Setup 197
- 12.15 Configuring Manual Key 197
- Figure 111 VPN: Manual Key 198
- Table 80 VPN: Manual Key 198
- 12.16 Viewing SA Monitor 200
- Figure 112 VPN: SA Monitor 201
- Table 81 VPN: SA Monitor 201
- Advanced 205
- CHAPTER 13 207
- 13.2.1 Static Route Edit 208
- Chapter 13 Static Route 209
- Table 86 Static Route Edit 209
- Chapter 13 Static Route 210
- CHAPTER 14 211
- 14.5 Scheduler 212
- 14.7 Configuring Summary 215
- 14.8.1 Rule Configuration 218
- 14.9 Bandwidth Monitor 220
- CHAPTER 15 221
- Chapter 15 Dynamic DNS Setup 222
- Figure 124 Dynamic DNS 222
- Table 97 Dynamic DNS 222
- Device and the DDNS server 223
- CHAPTER 16 225
- 16.2 WWW 226
- 16.3 Telnet 227
- 16.4 Configuring Telnet 227
- 16.5 Configuring FTP 228
- 16.6 SNMP 229
- 16.6.1 Supported MIBs 230
- 16.6.2 SNMP Traps 230
- 16.6.3 Configuring SNMP 231
- 16.7 Configuring DNS 232
- 16.8 Configuring ICMP 233
- 16.9 TR-069 (P-661H Only) 234
- Table 106 TR-069 Commands 235
- CHAPTER 17 237
- 17.2 UPnP and ZyXEL 238
- Table 107 Configuring UPnP 239
- Figure 143 System Tray Icon 245
- Network 246
- Maintenance 249
- CHAPTER 18 251
- Chapter 18 System 252
- 18.2 Time Setting 253
- Chapter 18 System 255
- CHAPTER 19 257
- Chapter 19 Logs 258
- Figure 150 View Log 258
- Table 110 View Logs 258
- Chapter 19 Logs 259
- Figure 151 Log Settings 259
- Table 111 Log Settings 259
- CHAPTER 20 261
- Chapter 20 Tools 262
- 20.2 Configuration 263
- Table 113 Configuration 264
- 20.3 Restart 265
- CHAPTER 21 267
- 21.2 DSL Line Diagnostic 268
- Troubleshooting 269
- CHAPTER 22 271
- V I forgot the password 272
- 22.3 Internet Access 273
- Chapter 22 Troubleshooting 274
- CHAPTER 23 275
- 23.3 Cable Pin Assignments 279
- PART VII 281
- APPENDIX A 283
- Installing Components 284
- Configuring 285
- Windows 2000/NT/XP 286
- Windows Vista 291
- Macintosh OS 8/9 296
- Macintosh OS X 298
- Verifying Settings 299
- Using Configuration Files 301
- APPENDIX B 305
- JavaScripts 308
- Java Permissions 309
- Mozilla Firefox 310
- APPENDIX C 313
- Subnet Masks 314
- Notation 315
- Subnetting 316
- Example: Four Subnets 317
- Example: Eight Subnets 318
- Subnet Planning 319
- Configuring IP Addresses 320
- IP Address Conflicts 321
- APPENDIX D 323
- Appendix D Wireless LANs 324
- Appendix D Wireless LANs 325
- Fragmentation Threshold 326
- Preamble Type 327
- IEEE 802.11g Wireless LAN 327
- Wireless Security Overview 327
- IEEE 802.1x 328
- Types of EAP Authentication 329
- PEAP (Protected EAP) 330
- Dynamic WEP Key Exchange 331
- WPA and WPA2 331
- Encryption 332
- User Authentication 332
- Security Parameters Summary 334
- Antenna Overview 335
- Antenna Characteristics 335
- Types of Antennas for WLAN 335
- Positioning Antennas 336
- APPENDIX E 337
- Appendix E Common Services 338
- Appendix E Common Services 339
- APPENDIX F 341
- ZyXEL Limited Warranty 343
- Appendix F Legal Information 344
- APPENDIX G 345
- Appendix G Customer Support 346
- Appendix G Customer Support 347
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