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IP Subnetting 173
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.
The remaining 7 bits determine the number of hosts each subnet can have. Host IDs of all
zeros represent the subnet itself and host IDs of all ones are the broadcast address for that
subnet, so the actual number of hosts available on each subnet in the example above is 2
7
– 2
or 126 hosts for each subnet.
192.168.1.0 with mask 255.255.255.128 is the subnet itself, and 192.168.1.127 with mask
255.255.255.128 is the directed broadcast address for the first subnet. Therefore, the lowest IP
address that can be assigned to an actual host for the first subnet is 192.168.1.1 and the highest
is 192.168.1.126. Similarly the host ID range for the second subnet is 192.168.1.129 to
192.168.1.254.
Note: In the following charts, shaded/bolded last octet bit values indicate host
ID bits “borrowed” to form network ID bits. The number of “borrowed” host ID
bits determines the number of subnets you can have. The remaining number
of host ID bits (after “borrowing”) determines the number of hosts you can
have on each subnet.
Table 75 Subnet 1
NETWORK NUMBER
LAST OCTET BIT
VALUE
IP Address 192.168.1. 0
IP Address (Binary) 11000000.10101000.00000001. 00000000
Subnet Mask 255.255.255. 128
Subnet Mask (Binary) 11111111.11111111.11111111. 10000000
Subnet Address: 192.168.1.0 Lowest Host ID: 192.168.1.1
Broadcast Address:
192.168.1.127
Highest Host ID: 192.168.1.126
Table 76 Subnet 2
NETWORK NUMBER LAST OCTET BIT VALUE
IP Address 192.168.1. 128
IP Address (Binary) 11000000.10101000.00000001. 10000000
Subnet Mask 255.255.255. 128
Subnet Mask (Binary) 11111111.11111111.11111111. 10000000
Subnet Address:
192.168.1.128
Lowest Host ID: 192.168.1.129
Broadcast Address:
192.168.1.255
Highest Host ID: 192.168.1.254
- User’s Guide 1
- Copyright 2
- Statement 3
- Federal Communications 3
- Commission (FCC) Interference 3
- Certifications 4
- Safety Warnings 5
- ZyXEL Limited Warranty 6
- Customer Support 7
- 8 Customer Support 8
- Customer Support 9 9
- Table of Contents 10
- List of Figures 16
- List of Tables 20
- About This User's Guide 24
- Related Documentation 24
- User Guide Feedback 25
- Syntax Conventions 25
- Graphics Icons Key 25
- CHAPTER 1 26
- 1.2.2 Firmware Features 27
- Table 2 IEEE 802.11g 28
- CHAPTER 2 32
- 2.2.2 Power Port 34
- 2.2.3 The RESET Button 34
- 2.5 Configuring Your G-1000 35
- CHAPTER 3 36
- 3.2 Resetting the G-1000 37
- CHAPTER 4 40
- Chapter 4 Wizard Setup 41 41
- 42 Chapter 4 Wizard Setup 42
- 4.4 Wizard Setup: IP Address 43
- 44 Chapter 4 Wizard Setup 44
- 4.5 Basic Setup Complete 45
- CHAPTER 5 46
- 5.3 Configuring Password 47
- 5.4 Configuring Time Setting 48
- Chapter 5 System Screens 49 49
- Table 11 Time Setting 49
- CHAPTER 6 50
- 6.2.3 Restricted Access 51
- 6.2.4 Hide G-1000 Identity 51
- 6.3.1 WEP Encryption 52
- Chapter 6 Wireless LAN 53 53
- Figure 14 Wireless 53
- Table 13 Wireless 53
- 54 Chapter 6 Wireless LAN 54
- 6.4 Configuring Roaming 55
- 56 Chapter 6 Wireless LAN 56
- Figure 15 Roaming Example 56
- 6.5 MAC Filter 57
- 58 Chapter 6 Wireless LAN 58
- Table 15 MAC Address Filter 58
- 6.6 Introduction to WPA 59
- 60 Chapter 6 Wireless LAN 60
- Chapter 6 Wireless LAN 61 61
- 62 Chapter 6 Wireless LAN 62
- Chapter 6 Wireless LAN 63 63
- 64 Chapter 6 Wireless LAN 64
- Chapter 6 Wireless LAN 65 65
- 66 Chapter 6 Wireless LAN 66
- Chapter 6 Wireless LAN 67 67
- 6.8 Configuring RADIUS 68
- Chapter 6 Wireless LAN 69 69
- Figure 26 RADIUS Screen 69
- Table 22 RADIUS Screen 69
- CHAPTER 7 70
- 7.2 Configuring IP 71
- CHAPTER 8 72
- 8.2 Configuring WWW 73
- 8.3 Configuring Telnet 74
- 8.4 Configuring TELNET 74
- 8.5 Configuring FTP 75
- 8.6 SNMP 76
- 8.6.1 Supported MIBs 78
- 8.6.2 SNMP Traps 78
- 8.6.3 SNMP Interface Index 79
- 8.6.4 Configuring SNMP 79
- CHAPTER 9 82
- 9.2 Configuring Log Settings 83
- 84 Chapter 9 Log Screens 84
- Figure 35 Log Settings 84
- Table 32 Log Settings 84
- Chapter 9 Log Screens 85 85
- CHAPTER 10 86
- 10.3 Association List 87
- 10.4 F/W Upload Screen 88
- Chapter 10 Maintenance 89 89
- Figure 39 Firmware Upload 89
- Table 36 Firmware Upload 89
- 10.5 Configuration Screen 90
- 10.5.1 Backup Configuration 91
- 92 Chapter 10 Maintenance 92
- 10.6 Restart Screen 93
- CHAPTER 11 94
- Table 39 Main Menu Commands 96
- Table 40 Main Menu Summary 97
- CHAPTER 12 98
- Chapter 12 General Setup 99 99
- ESC] at any time to cancel 99
- CHAPTER 13 100
- 13.3 Wireless LAN Setup 101
- G-1000 User’s Guide 102
- 102 Chapter 13 LAN Setup 102
- Chapter 13 LAN Setup 103 103
- 104 Chapter 13 LAN Setup 104
- 13.3.2 Configuring Roaming 105
- 106 Chapter 13 LAN Setup 106
- Chapter 13 LAN Setup 107 107
- CHAPTER 14 108
- CHAPTER 15 110
- CHAPTER 16 112
- 16.3 802.1x 114
- CHAPTER 17 118
- 17.2 System Information 119
- 17.2.1 System Information 120
- 17.3 Diagnostic 121
- CHAPTER 18 124
- 18.2 Backup Configuration 125
- 18.2.4 Example: TFTP Command 128
- CHAPTER 19 130
- 19.2 Time and Date Setting 131
- 19.3 Remote Management Setup 133
- 19.5 System Timeout 135
- Appendix A 136
- Troubleshooting 136
- Problems with the Password 137
- Problems with Telnet 137
- Appendix B 138
- Specifications 138
- Specifications 139 139
- Appendix C 140
- Brute-Force Password Guessing 140
- Protection 140
- Appendix D 142
- Installing Components 143
- Configuring 144
- Windows 2000/NT/XP 145
- Macintosh OS 8/9 149
- Macintosh OS X 151
- Verifying Settings 152
- Appendix E 154
- IP addresses dynamically 156
- Appendix F 158
- Wireless LANs 158
- Wireless LANs 159 159
- 160 Wireless LANs 160
- Fragmentation Threshold 161
- Preamble Type 162
- IEEE 802.1x 163
- Types of Authentication 164
- PEAP (Protected EAP) 165
- Dynamic WEP Key Exchange 165
- Encryption 166
- Security Parameters Summary 167
- 168 Wireless LANs 168
- Wireless LANs 169 169
- Appendix G 170
- IP Subnetting 170
- Subnet Masks 171
- Subnetting 171
- Example: Two Subnets 172
- IP Subnetting 173 173
- Table 75 Subnet 1 173
- Table 76 Subnet 2 173
- Example: Four Subnets 174
- Example Eight Subnets 175
- 176 IP Subnetting 176
- IP Subnetting 177 177
- Appendix H 178
- Command Interpreter 178
- Command Interpreter 179 179
- Appendix I 180
- Log Descriptions 180
- Log Commands 181
- Log Command Example 182
- Log Descriptions 183 183
- Appendix J 184
- Recommendation 184
- Connector Type 185
- Appendix K 186
- Power Adaptor Specifications 186
- Numerics 188
- ZyAIR G-3000 User’s Guide 189
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