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Chapter 18 IP Source Guard
GS1510 Series User’s Guide
105
18.3.1.3 Configuring DHCP Snooping
Follow these steps to configure DHCP snooping on the Switch.
1 Enable DHCP snooping on the Switch.
2 Enable DHCP snooping on each VLAN.
3 Configure trusted and untrusted ports.
4 Configure static bindings.
18.3.2 ARP Inspection Overview
Use ARP inspection to filter unauthorized ARP packets on the network. This can
prevent many kinds of man-in-the-middle attacks, such as the one in the following
example.
Figure 54 Example: Man-in-the-middle Attack
In this example, computer B tries to establish a connection with computer A.
Computer X is in the same broadcast domain as computer A and intercepts the
ARP request for computer A. Then, computer X does the following things:
• It pretends to be computer A and responds to computer B.
• It pretends to be computer B and sends a message to computer A.
As a result, all the communication between computer A and computer B passes
through computer X. Computer X can read and alter the information passed
between them.
18.3.2.1 ARP Inspection and MAC Address Filters
When the Switch identifies an unauthorized ARP packet, it automatically creates a
MAC address filter to block traffic from the source MAC address and source VLAN
ID of the unauthorized ARP packet. You can configure how long the MAC address
filter remains in the Switch.
A
X
B
- GS1510-16/GS1510-24 1
- About This User's Guide 3
- Customer Support 4
- Document Conventions 5
- Icons Used in Figures 6
- Safety Warnings 7
- Contents Overview 10
- GS1510 Series 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
- Basic Settings 33
- CHAPTER 4 35
- 4.3.1 Smart Mode 36
- 4.3.1.1 IP Setting 37
- 4.3.1.3 Web Authentication 38
- 4.3.1.4 DHCP Snooping 38
- 4.3.3 The Navigation Panel 40
- LINK DESCRIPTION 41
- 4.5 Switch Lockout 43
- 4.6 Resetting the Switch 43
- CHAPTER 5 45
- Table 4 System (continued) 46
- CHAPTER 6 47
- 6.3 Jumbo Frame 48
- 6.4 SNTP 49
- Chapter 6 General Settings 50
- CHAPTER 7 51
- 7.4 Static MAC Settings 52
- 7.5 MAC Table 53
- Table 9 MAC Table 54
- CHAPTER 8 55
- Table 10 Port Mirroring 56
- CHAPTER 9 57
- Figure 33 Port Settings 58
- Table 11 Port Settings 59
- Chapter 9 Port Settings 60
- PART III 61
- CHAPTER 10 63
- 10.4 Port Isolation 64
- Figure 34 Port Isolation 65
- Table 12 Port Isolation 66
- 10.5 VLAN Settings 67
- 10.6 Tag Settings 68
- 10.7 Port Settings 69
- Chapter 10 VLAN 70
- CHAPTER 11 71
- Table 16 EEE (continued) 72
- CHAPTER 12 73
- 12.4 General Settings 74
- 12.5 Port Settings 75
- Chapter 12 IGMP Snooping 76
- CHAPTER 13 77
- 13.4 Static Trunk 78
- 13.5 LACP 79
- Table 20 LACP 80
- CHAPTER 14 81
- 14.3 Loop Guard 83
- Chapter 14 Loop Guard 84
- CHAPTER 15 85
- 15.4 Port Priority 86
- 15.5 IP DiffServ (DSCP) 87
- 15.6 Priority/Queue Mapping 89
- 15.7 Queuing Method 90
- Chapter 15 QoS 91
- Chapter 15 QoS 92
- CHAPTER 16 93
- Chapter 16 Storm Control 94
- CHAPTER 17 95
- 17.3.1 STP Terminology 96
- 17.3.2 How STP Works 96
- 17.4 General Settings 97
- 17.5 STP Status Screen 98
- Security and 101
- Management 101
- CHAPTER 18 103
- 18.3.2.3 Syslog 106
- 18.4 DHCP Snooping 107
- 18.5 Port Settings 108
- Figure 56 Port Settings 109
- Table 31 Port Settings 109
- 18.6 ARP Inspection 110
- 18.6.1 Filter Table 111
- 18.7 Binding Table 112
- 18.7.2 Binding Table 114
- Chapter 18 IP Source Guard 115
- LABEL DESCRIPTION 115
- Chapter 18 IP Source Guard 116
- CHAPTER 19 117
- 19.3 What You Need to Know 118
- 19.4 Global Settings 118
- Figure 62 Global Settings 119
- Table 36 Global Settings 119
- 19.5 Port Settings 120
- Table 37 Port Settings 121
- Chapter 19 802.1x 122
- CHAPTER 20 123
- 20.4 Configuration 125
- 20.5 Customization 126
- Figure 67 Customization 127
- Table 39 Customization 127
- Chapter 20 Web Authentication 128
- CHAPTER 21 129
- 21.3 Configuration 130
- 21.3.2 Upgrade Configuration 131
- 21.4 Firmware 132
- 21.5 Reboot 132
- 21.6 System Log 133
- Figure 76 System Log 134
- Table 41 System Log 134
- CHAPTER 22 135
- Table 42 SNMP Commands 136
- 22.4 SNMP Settings 137
- 22.5 Community Name 138
- Figure 79 Community Name 139
- Table 45 Community Name 139
- 22.6 Trap Receiver 140
- Chapter 22 SNMP 141
- Chapter 22 SNMP 142
- CHAPTER 23 143
- Figure 81 User Account 144
- Table 47 User Account 144
- Troubleshooting & 145
- Product 145
- Specifications 145
- CHAPTER 24 147
- 24.2 Switch Access and Login 148
- Chapter 24 Troubleshooting 150
- CHAPTER 25 151
- Table 51 Firmware Features 153
- STANDARD DESCRIPTION 155
- Appendices and 157
- APPENDIX A 159
- Using the Software 163
- APPENDIX B 165
- Subnet Masks 166
- Network Size 167
- Notation 168
- Subnetting 168
- Example: Four Subnets 170
- Table 58 Subnet 1 171
- Table 59 Subnet 2 171
- Table 60 Subnet 3 171
- Table 61 Subnet 4 171
- Example: Eight Subnets 172
- Subnet Planning 172
- Configuring IP Addresses 173
- Private IP Addresses 174
- APPENDIX C 175
- FCC Warning 176
- CE Mark Warning: 176
- Warning: 176
- Notices 176
- ZyXEL Limited Warranty 177
- Appendix C Legal Information 178
- APPENDIX D 179
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