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Chapter 9 Firewall Configuration
P-661H/HW Series User’s Guide
165
Figure 95 Firewall Example: Rules: MyService
9.9 Anti Probing
If an outside user attempts to probe an unsupported port on your ZyXEL Device, an ICMP
response packet is automatically returned. This allows the outside user to know the ZyXEL
Device exists. The ZyXEL Device supports anti probing, which prevents the ICMP response
packet from being sent. This keeps outsiders from discovering your ZyXEL Device when
unsupported ports are probed.
Internet Control Message Protocol (ICMP) is a message control and error-reporting protocol
between a host server and a gateway to the Internet. ICMP uses Internet Protocol (IP)
datagrams, but the messages are processed by the TCP/IP software and directly apparent to the
application user.
Refer to Section 8.1 on page 137 for more information.
Click Security > Firewall > Anti Probing to display the screen as shown.
Figure 96 Firewall: Anti Probing
- 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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