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Appendix A IP Addresses and Subnetting
GS-1524/GS-1548 User’s Guide
157
In this example, the company network address is 192.168.1.0. The first three
octets of the address (192.168.1) are the network number, and the remaining
octet is the host ID, allowing a maximum of 2
8
– 2 or 254 possible hosts.
The following figure shows the company network before subnetting.
Figure 90 Subnetting Example: Before Subnetting
You can “borrow” one of the host ID bits to divide the network 192.168.1.0 into
two separate sub-networks. The subnet mask is now 25 bits (255.255.255.128 or
/25).
The “borrowed” host ID bit can have a value of either 0 or 1, allowing two
subnets; 192.168.1.0 /25 and 192.168.1.128 /25.
- GS-1524 / GS-1548 1
- About This User's Guide 3
- Document Conventions 5
- Icons Used in Figures 6
- Safety Warnings 7
- Contents Overview 10
- GS-1524/GS-1548 User’s Guide 10
- Table of Contents 11
- Introduction and 17
- Hardware Overview 17
- CHAPTER 1 19
- 1.1.2 Bridging Example 20
- CHAPTER 2 23
- 2.2.1.1 Precautions 24
- CHAPTER 3 27
- 3.1.1 Ethernet Ports 28
- 3.1.2 Mini-GBIC Slots 28
- 3.2 LEDs 30
- 3.3 Rear Panel 31
- 3.4.1 Power Connector 32
- Basic & Advanced 33
- Settings 33
- CHAPTER 4 35
- 4.3 The Status Screen 36
- 4.3.1 The LED Panel 37
- 4.3.2 The Navigation Panel 37
- LINK DESCRIPTION 38
- 4.5 Switch Lockout 40
- 4.6 Resetting the Switch 40
- 4.8 Help 41
- CHAPTER 5 43
- 5.1.1 Configure IP Address 44
- 5.1.3 Backup Settings 45
- 5.1.4 Restore Settings 46
- 5.3 Firmware Upgrade 47
- CHAPTER 6 49
- 6.2 Port Configuration 50
- Chapter 6 Port Settings 51
- Chapter 6 Port Settings 52
- CHAPTER 7 53
- 7.3 Port Statistics 54
- CHAPTER 8 57
- 8.2 Static VLAN 58
- Table 12 VLAN: VLAN Status 59
- Figure 35 VLAN: Edit VLAN 60
- Table 13 VLAN: Create VLAN 60
- Table 14 VLAN: Edit VLAN 61
- Chapter 8 VLAN 62
- CHAPTER 9 63
- 9.2 Trunk Setting Screen 64
- CHAPTER 10 65
- Chapter 10 Mirroring 66
- CHAPTER 11 67
- 11.2 QoS Enhancement 68
- 11.3 Configuring QoS 69
- 11.4 Advanced QoS Settings 70
- 11.4.1 Port Based QoS 71
- 11.4.2 DSCP Based QoS 72
- 11.4.4 DSCP Based QoS Screen 73
- 11.4.5 ToS Based QoS 74
- 11.4.6 IP Address Based QoS 75
- CHAPTER 12 77
- 12.1.1 Rate Limit Screen 78
- CHAPTER 13 83
- CHAPTER 14 87
- Chapter 14 Cable Diagnostics 88
- CHAPTER 15 89
- Table 29 DoS Attack Summary 90
- CHAPTER 16 93
- 16.2 Auto VoIP Settings 94
- PART III 95
- CHAPTER 17 97
- 17.2 Logging Screen 98
- 17.3 Logging: Add Server 99
- Figure 56 Logs: RAM/Flash 100
- Table 35 Logs: RAM/Flash 100
- Chapter 17 Event Logging 101
- LABEL DESCRIPTION 101
- Chapter 17 Event Logging 102
- 17.5.1 Search Results 103
- CHAPTER 18 105
- 18.1.1 Supported MIBs 106
- 18.1.2 SNMP Traps 107
- 18.1.4 SNMP EngineID 107
- 18.2 SNMP Group 108
- 18.2.1 SNMP Group: Create 109
- 18.3 SNMP User 110
- Figure 64 SNMP User 111
- Table 44 SNMP User 111
- 18.3.1 SNMP User: Create 112
- 18.3.2 SNMP User: Modify 113
- 18.4 SNMP Community 114
- 18.5 SNMP Notification 116
- 18.6 SNMP Trap Station 117
- Table 51 SNMP Trap Station 118
- Chapter 18 SNMP 120
- CHAPTER 19 121
- 19.4 RMON-Lite History MIB 124
- 19.5 RMON Alarm: Overview 129
- Chapter 19 RMON-Lite 131
- 19.6 RMON Event: Overview 132
- Chapter 19 RMON-Lite 136
- CHAPTER 20 137
- 20.2 Enabling Dynamic ARP 138
- Table 67 ARP Table 139
- Table 68 ARP Table 140
- CHAPTER 21 141
- 21.2 Switch Access and Login 142
- Chapter 21 Troubleshooting 144
- CHAPTER 22 145
- Table 72 Firmware Features 148
- Appendices and 151
- APPENDIX A 153
- Subnet Masks 154
- Network Size 155
- Notation 156
- Subnetting 156
- Example: Four Subnets 158
- Table 77 Subnet 1 159
- Table 78 Subnet 2 159
- Table 79 Subnet 3 159
- Table 80 Subnet 4 159
- Example: Eight Subnets 160
- Subnet Planning 160
- Configuring IP Addresses 161
- Private IP Addresses 162
- APPENDIX B 163
- FCC Warning 164
- CE Mark Warning: 164
- Warning: 164
- Notices 164
- ZyXEL Limited Warranty 165
- Appendix B Legal Information 166
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