Zyxel-communications ADSL2+ Ethernet Gateway P-660R-T Series Manuel d'utilisateur Page 276
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P-660R-T Series User’s Guide
Appendix C IP Subnetting 276
Since the mask is always a continuous number of ones beginning from the left, followed by a
continuous number of zeros for the remainder of the 32 bit mask, you can simply specify the
number of ones instead of writing the value of each octet. This is usually specified by writing
a “/” followed by the number of bits in the mask after the address.
For example, 192.1.1.0 /25 is equivalent to saying 192.1.1.0 with mask 255.255.255.128.
The following table shows all possible subnet masks for a class “C” address using both
notations.
Table 89 Alternative Subnet Mask Notation
SUBNET MASK IP ADDRESS SUBNET MASK “1” BITS LAST OCTET BIT VALUE
255.255.255.0 /24 0000 0000
255.255.255.128 /25 1000 0000
255.255.255.192 /26 1100 0000
255.255.255.224 /27 1110 0000
255.255.255.240 /28 1111 0000
255.255.255.248 /29 1111 1000
255.255.255.252 /30 1111 1100
The first mask shown is the class “C” natural mask. Normally if no mask is specified it is
understood that the natural mask is being used.
Example: Two Subnets
As an example, you have a class “C” address 192.168.1.0 with subnet mask of 255.255.255.0.
Table 90 Two Subnets Example
NETWORK NUMBER HOST ID
IP Address 192.168.1. 0
IP Address (Binary) 11000000.10101000.00000001. 00000000
Subnet Mask 255.255.255. 0
Subnet Mask (Binary) 11111111.11111111.11111111. 00000000
The first three octets of the address make up the network number (class “C”). You want to
have two separate networks.
Divide the network 192.168.1.0 into two separate subnets by converting one of the host ID bits
of the IP address to a network number bit. The “borrowed” host ID bit can be either “0” or “1”
thus giving two subnets; 192.168.1.0 with mask 255.255.255.128 and 192.168.1.128 with
mask 255.255.255.128.
- P-660R-T Series 1
- Copyright 2
- Federal Communications 3
- Statement 3
- Safety Warnings 4
- ZyXEL Limited Warranty 5
- Customer Support 6
- 7 Customer Support 7
- Table of Contents 8
- List of Figures 18
- List of Tables 24
- About This User's Guide 28
- Syntax Conventions 28
- Related Documentation 28
- User Guide Feedback 29
- Graphics Icons Key 29
- Introduction to DSL 30
- 31 Introduction to DSL 31
- CHAPTER 1 32
- Networking Compatibility 35
- Multiplexing 35
- Encapsulation 35
- Network Management 35
- 1.2.1 Internet Access 36
- 1.4 Front Panel LEDs 37
- CHAPTER 2 40
- 2.2 Resetting the Prestige 41
- 2.2.1 Using the Reset Button 42
- CHAPTER 3 44
- 3.1.2 Multiplexing 45
- 3.1.3 VPI and VCI 45
- Chapter 3 Wizard Setup 46 46
- 3.2.1 IP Address Assignment 47
- 3.2.3 NAT 48
- 49 Chapter 3 Wizard Setup 49
- Chapter 3 Wizard Setup 50 50
- 51 Chapter 3 Wizard Setup 51
- 3.2.5 DHCP Setup 52
- 53 Chapter 3 Wizard Setup 53
- Chapter 3 Wizard Setup 54 54
- 55 Chapter 3 Wizard Setup 55
- CHAPTER 4 56
- 57 Chapter 4 Password Setup 57
- CHAPTER 5 58
- 5.2 DNS Server Address 59
- 5.4 LAN TCP/IP 60
- 5.5 Any IP 61
- 5.5.1 How Any IP Works 62
- 5.6 Configuring LAN 63
- Chapter 5 LAN Setup 64 64
- 65 Chapter 5 LAN Setup 65
- CHAPTER 6 66
- 6.3 PPPoE Encapsulation 67
- 6.4 Traffic Shaping 67
- 6.6 Configuring WAN Setup 68
- 69 Chapter 6 WAN Setup 69
- Figure 19 WAN Setup (PPPoE) 69
- Table 12 WAN Setup 69
- Chapter 6 WAN Setup 70 70
- 6.7 Traffic Redirect 71
- 6.8 Configuring WAN Backup 72
- 73 Chapter 6 WAN Setup 73
- Figure 22 WAN Backup 73
- Table 13 WAN Backup 73
- Check WAN IP Address 74
- 75 Chapter 6 WAN Setup 75
- CHAPTER 7 76
- 7.1.2 What NAT Does 77
- 7.1.3 How NAT Works 77
- 7.1.4 NAT Application 78
- 7.1.5 NAT Mapping Types 78
- Table 15 NAT Mapping Types 79
- 7.3 SUA Server 80
- 7.4 Selecting the NAT Mode 81
- 7.5 Configuring SUA Server 82
- CHAPTER 8 88
- Figure 30 Dynamic DNS 89
- Table 21 Dynamic DNS 89
- CHAPTER 9 90
- 91 Chapter 9 Time and Date 91
- Table 22 Time and Date 91
- CHAPTER 10 92
- 10.2 Telnet 93
- 10.3 FTP 93
- 10.4 Web 93
- Figure 33 Remote Management 94
- Table 23 Remote Management 94
- CHAPTER 11 96
- 11.2 UPnP and ZyXEL 97
- P-660R-T Series User’s Guide 100
- Figure 44 System Tray Icon 104
- Network 105
- CHAPTER 12 108
- 109 Chapter 12 Maintenance 109
- Figure 49 System Status 109
- Table 25 System Status 109
- 12.2.1 System Statistics 110
- 12.3 DHCP Table Screen 111
- 12.4 Any IP Table Screen 112
- 12.5 Diagnostic Screens 113
- Chapter 12 Maintenance 114 114
- 12.6 Firmware Screen 115
- Chapter 12 Maintenance 116 116
- Figure 55 Firmware Upgrade 116
- Table 31 Firmware Upgrade 116
- 117 Chapter 12 Maintenance 117
- Figure 57 Error Message 117
- CHAPTER 13 118
- Prestige 119
- ? > or 121
- *” for each character 123
- CHAPTER 14 124
- CHAPTER 15 128
- Press ENTER to Confirm 129
- CHAPTER 16 132
- Figure 66 133
- CHAPTER 17 136
- 17.4 IP Alias Setup 137
- 17.5 Route IP Setup 138
- Menu 4 Internet Access Setup 140
- CHAPTER 18 142
- 18.4 Remote Node Filter 148
- Figure 78 Internet Security 149
- 18.5.3 Advance Setup Options 152
- CHAPTER 19 154
- CHAPTER 20 158
- CHAPTER 21 162
- 21.3 NAT Setup 164
- 21.3.1.3 Ordering Your Rules 167
- 21.5 General NAT Examples 170
- Figure 104 NAT Example 2 171
- Figure 106 NAT Example 3 173
- Figure 111 NAT Example 4 175
- CHAPTER 22 178
- Filter Rule 179
- Filter Set 179
- 22.4.1 TCP/IP Filter Rule 182
- 22.4.2 Generic Filter Rule 185
- 22.5 Filter Types and NAT 187
- 22.6 Example Filter 187
- 22.7.1 Ethernet Traffic 190
- 22.7.2 Remote Node Filters 190
- CHAPTER 23 192
- 23.2 Supported MIBs 193
- 23.3 SNMP Configuration 193
- 23.4 SNMP Traps 194
- CHAPTER 24 196
- 24.3 System Information 198
- 24.3.2 Console Port Speed 199
- 24.4 Log and Trace 200
- 24.4.2 Syslog and Accounting 201
- 24.5 Diagnostic 203
- CHAPTER 25 206
- 25.2 Backup Configuration 207
- 25.2.4 GUI-based FTP Clients 209
- 25.2.7 TFTP Command Example 210
- 25.3 Restore Configuration 211
- 25.4.1 Firmware File Upload 213
- 25.4.5 TFTP File Upload 215
- CHAPTER 26 218
- 26.2 Call Control Support 219
- 26.3 Time and Date Setting 220
- 26.3.1 Resetting the Time 221
- CHAPTER 27 224
- 27.4 System Timeout 226
- CHAPTER 28 228
- 28.4 IP Routing Policy Setup 229
- 28.5 Applying an IP Policy 232
- IP=0.0.0.0 235
- CHAPTER 29 238
- CHAPTER 30 242
- Figure 166 Pop-up Blocker 247
- Figure 168 Internet Options 248
- 30.9.1.2 JavaScripts 249
- 3 Scroll down to Scripting 250
- 30.9.1.3 Java Permissions 251
- 30.9.1.3.1 JAVA (Sun) 252
- Figure 173 Java (Sun) 253
- Appendix A 254
- Product Specifications 254
- 255 Appendix A 255
- Table 85 Firmware 255
- 257 Appendix A 257
- Appendix B 258
- Installing Components 259
- Configuring 260
- Windows 2000/NT/XP 261
- Macintosh OS 8/9 266
- Macintosh OS X 268
- Verifying Settings 269
- Using Configuration Files 271
- Appendix C 274
- IP Subnetting 274
- Subnet Masks 275
- Subnetting 275
- Example: Two Subnets 276
- 277 Appendix C IP Subnetting 277
- Table 91 Subnet 1 277
- Table 92 Subnet 2 277
- Example: Four Subnets 278
- Example Eight Subnets 279
- Appendix C IP Subnetting 280 280
- 281 Appendix C IP Subnetting 281
- Appendix D 282
- Splitters and Microfilters 282
- Prestige With ISDN 283
- Appendix E 286
- Command Interpreter 286
- Appendix F 288
- Log Descriptions 288
- Table 103 CDR Logs 290
- Table 104 PPP Logs 290
- Table 105 ICMP Notes 290
- Appendix G 292
- How PPPoE Works 293
- Prestige as a PPPoE Client 293
- APPENDIX H 294
- Numerics 296
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