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ZyWALL 5/35/70 Series User’s Guide
Appendix C IP Subnetting 137
Example: Four Subnets
The above example illustrated using a 25-bit subnet mask to divide a class “C” address space
into two subnets. Similarly to divide a class “C” address into four subnets, you need to
“borrow” two host ID bits to give four possible combinations of 00, 01, 10 and 11. The subnet
mask is 26 bits (11111111.11111111.11111111.11000000) or 255.255.255.192. Each subnet
contains 6 host ID bits, giving 2
6
-2 or 62 hosts for each subnet (all 0’s is the subnet itself, all
1’s is the broadcast address on the subnet).
Table 38 Subnet 1
NETWORK NUMBER
LAST OCTET BIT
VALUE
IP Address 192.168.1. 0
IP Address (Binary) 11000000.10101000.00000001. 00000000
Subnet Mask (Binary) 11111111.11111111.11111111. 11000000
Subnet Address: 192.168.1.0 Lowest Host ID: 192.168.1.1
Broadcast Address:
192.168.1.63
Highest Host ID: 192.168.1.62
Table 39 Subnet 2
NETWORK NUMBER
LAST OCTET BIT
VALUE
IP Address 192.168.1. 64
IP Address (Binary) 11000000.10101000.00000001. 01000000
Subnet Mask (Binary) 11111111.11111111.11111111. 11000000
Subnet Address: 192.168.1.64 Lowest Host ID: 192.168.1.65
Broadcast Address: 192.168.1.127 Highest Host ID: 192.168.1.126
Table 40 Subnet 3
NETWORK NUMBER
LAST OCTET BIT
VALUE
IP Address 192.168.1. 128
IP Address (Binary) 11000000.10101000.00000001. 10000000
Subnet Mask (Binary) 11111111.11111111.11111111. 11000000
Subnet Address:
192.168.1.128
Lowest Host ID: 192.168.1.129
Broadcast Address:
192.168.1.191
Highest Host ID: 192.168.1.190
- ZyXEL G-560 1
- Copyright 3
- Federal Communications 4
- Statement 4
- Certifications 5
- Safety Warnings 6
- ZyXEL Limited Warranty 7
- Customer Support 8
- Customer Support 9 9
- ZyXEL G-560 User’s Guide 10
- 10 Customer Support 10
- Table of Contents 11
- Chapter 7 13
- List of Figures 15
- 18 List of Figures 18
- List of Tables 19
- Related Documentation 21
- User Guide Feedback 21
- Syntax Conventions 21
- Graphics Icons Key 22
- CHAPTER 1 23
- 1.3.1 Access Point 26
- 1.3.2 Access Point + Bridge 27
- 1.4 The LED Display 28
- CHAPTER 2 31
- 2.2.1.1 Windows 2000/NT/XP 32
- 2.3 Wireless Connection 34
- 2.4 Resetting the G-560 35
- CHAPTER 3 37
- Figure 13 Welcome Screen 38
- 3.3.1 Basic Settings 39
- 3.3.2 Wireless Settings 40
- 3.3.3 Security Settings 41
- 3.3.3.2 WEP 42
- 3.3.4 Confirm Your Settings 43
- CHAPTER 4 45
- 4.1.1 Statistics 46
- 4.1.2 Association List 47
- 48 Chapter 4 Status Screens 48
- CHAPTER 5 49
- 50 Chapter 5 System Screens 50
- Chapter 5 System Screens 51 51
- Figure 25 System Settings 51
- Table 7 System Settings 51
- 5.4 Time Settings 52
- CHAPTER 6 53
- 6.1.3 ESS 54
- 6.2 Wireless LAN Basics 55
- 6.2.3 RTS/CTS 56
- 6.3 WMM QoS 57
- 6.4 Configuring Wireless 58
- Chapter 6 Wireless Screens 59 59
- 6.4.2.1 Bridge Loop 61
- Chapter 6 Wireless Screens 63 63
- Chapter 6 Wireless Screens 65 65
- 6.6 WEP Overview 67
- 6.7 802.1x Overview 68
- 6.8 Introduction to RADIUS 69
- 6.11.1 Encryption 71
- 6.11.2 User Authentication 72
- Chapter 6 Wireless Screens 73 73
- 6.16.1 Disable 74
- 6.16.2 WEP 75
- 6.16.4 WPA/WPA2/Mixed 77
- 6.16.5 IEEE 802.1x 78
- Chapter 6 Wireless Screens 79 79
- 6.17 MAC Filter 80
- 6.18 Introduction to OTIST 81
- 6.18.1.2 Wireless Client 82
- 6.18.2 Starting OTIST 83
- 6.18.3 Notes on OTIST 84
- CHAPTER 7 85
- 7.3 Logs 86
- 7.4 Configuration Screen 87
- 7.4.1 Backup Configuration 88
- 7.4.2 Restore Configuration 88
- 7.5 F/W Upload Screen 90
- 7.6 Language Screen 91
- CHAPTER 8 93
- 94 Chapter 8 Troubleshooting 94
- Chapter 8 Troubleshooting 95 95
- 96 Chapter 8 Troubleshooting 96
- Figure 66 Pop-up Blocker 96
- Figure 67 Internet Options 96
- Chapter 8 Troubleshooting 97 97
- Figure 68 Internet Options 97
- 8.4.1.2 JavaScripts 98
- 3 Scroll down to Scripting 99
- 8.4.1.3 Java Permissions 100
- 8.4.1.3.1 JAVA (Sun) 101
- Figure 73 Java (Sun) 102
- Figure 74 Pinging the G-650 102
- APPENDIX A 103
- Installing Components 104
- Configuring 105
- Windows 2000/NT/XP 106
- Macintosh OS 8/9 111
- Macintosh OS X 113
- Verifying Settings 114
- Using Configuration Files 116
- APPENDIX B 119
- 120 Appendix B Wireless LANs 120
- Figure 99 Basic Service Set 120
- Appendix B Wireless LANs 121 121
- Fragmentation Threshold 122
- IEEE 802.11g Wireless LAN 123
- IEEE 802.1x 123
- Types of RADIUS Messages 124
- EAP Authentication 125
- Types of Authentication 125
- PEAP (Protected EAP) 126
- WEP Encryption 126
- WEP Authentication Steps 127
- Dynamic WEP Key Exchange 128
- User Authentication 128
- Encryption 128
- Appendix B Wireless LANs 129 129
- Requirements for Roaming 130
- Appendix B Wireless LANs 131 131
- 132 Appendix B Wireless LANs 132
- APPENDIX C 133
- Subnet Masks 134
- Subnetting 134
- Example: Two Subnets 135
- 136 Appendix C IP Subnetting 136
- Table 36 Subnet 1 136
- Table 37 Subnet 2 136
- Example: Four Subnets 137
- Example Eight Subnets 138
- Appendix C IP Subnetting 139 139
- 140 Appendix C IP Subnetting 140
- Index 141 141
- 142 Index 142
- Index 143 143
- 144 Index 144
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