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packet and broadcast the DHCP-REQUEST packet which includes the assigned IP
address of the DHCP-OFFER packet.
（4） DHCP-ACK Stage: Since the DHCP-REQUEST packet is broadcasted, all DHCP servers
on the network segment can receive it. However, only the requested server processes the
request. If the DHCP server acknowledges assigning this IP address to the client, it will
send the DHCP-ACK packet back to the client. Otherwise, the Server will send the
DHCP-NAK packet to refuse assigning this IP address to the client.
¾ DHCP Cheating Attack
During the working process of DHCP, generally there is no authentication mechanism between
Server and Client. If there are several DHCP servers in the network, network confusion and
security problem will happen. The common cases incurring the illegal DHCP servers are the
following two:
（1） It’s common that the illegal DHCP server is manually configured by the user by mistake.
（2） Hacker exhausted the IP addresses of the normal DHCP server and then pretended to be
a legal DHCP server to assign the IP addresses and the other parameters to Clients. For
example, hacker used the pretended DHCP server to assign a modified DNS server
address to users so as to induce the users to the evil financial website or electronic trading
website and cheat the users of their accounts and passwords. The following figure
illustrates the DHCP Cheating Attack implementation procedure.
Figure 5-19 DHCP Cheating Attack Implementation Procedure
DHCP Filtering feature allows only the trusted ports to forward DHCP packets and thereby
ensures that users get proper IP addresses. DHCP Filtering is to monitor the process of hosts
obtaining the IP addresses from DHCP servers, and record the IP address, MAC address, VLAN
and the connected Port number of the Host for automatic binding. DHCP Filtering feature prevents
the network from the DHCP Server Cheating Attack by discarding the DHCP packets on the
distrusted port, so as to enhance the network security.
Choose the menu Switching → DHCP Filtering to load the following page.
- 8-Port Gigabit Smart Switch 1
- COPYRIGHT & TRADEMARKS 2
- FCC STATEMENT 2
- CE Mark Warning 2
- Safety Information 3
- Package Contents 8
- Chapter 1 About this Guide 9
- Chapter 2 Introduction 12
- 2.3.2 Rear Panel 13
- 3.1 Login 14
- 3.2 Configuration 14
- Chapter 4 System 16
- 4.1.2 Device Description 17
- 4.1.3 System Time 18
- 4.1.4 Daylight Saving Time 19
- 4.1.5 System IP 20
- 4.2 User Management 21
- 4.2.2 User Config 22
- 4.3 System Tools 23
- 4.3.2 Config Backup 24
- 4.3.3 Firmware Upgrade 24
- 4.3.4 System Reboot 25
- 4.3.5 System Reset 25
- 4.4 Access Security 26
- 4.4.2 SSL Config 27
- Figure 4-16 SSL Config 28
- 4.4.3 SSH Config 29
- ¾ Key Download 30
- ¾ Network Requirements 30
- Chapter 5 Switching 35
- 5.1.2 Port Mirror 36
- ¾ Mirror Group 37
- ¾ Mirroring Port 37
- ¾ Mirrored Port 37
- 5.1.3 Port Security 38
- 5.1.4 Port Isolation 39
- 5.1.5 Loopback Detection 40
- 5.2 LAG 41
- 5.2.1 LAG Table 42
- 5.2.2 Static LAG 43
- 5.2.3 LACP Config 44
- Figure 5-10 LACP Config 45
- 5.3 Traffic Monitor 46
- 5.3.2 Traffic Statistics 47
- 5.4 MAC Address 48
- 5.4.1 Address Table 49
- 5.4.2 Static Address 50
- 5.4.3 Dynamic Address 51
- Figure 5-15 Dynamic Address 52
- 5.4.4 Filtering Address 53
- 5.5 DHCP Filtering 54
- ¾ DHCP Cheating Attack 56
- Figure 5-20 DHCP Filtering 57
- Chapter 6 VLAN 58
- 6.1 802.1Q VLAN 59
- 6.1.1 VLAN Config 60
- ¾ VLAN Create 61
- ¾ VLAN Table 61
- ¾ VLAN Membership 61
- Chapter 7 Spanning Tree 64
- ¾ STP Timers 65
- ¾ STP Generation 65
- 7.1 STP Config 69
- ¾ Global Config 70
- ¾ Parameters Config 70
- 7.2 Port Config 71
- 7.3 MSTP Instance 73
- ¾ Instance Table 74
- ¾ VLAN-Instance Mapping 74
- 7.3.3 Instance Port Config 75
- 7.4 STP Security 76
- ¾ Root Protect 77
- ¾ TC Protect 77
- ¾ BPDU Protect 77
- ¾ BPDU Filter 77
- 7.4.2 TC Protect 78
- Figure 7-11 TC Protect 79
- Chapter 8 Multicast 83
- ¾ Multicast Address 84
- ¾ Multicast Address Table 84
- 8.1 IGMP Snooping 85
- 8.1.1 Snooping Config 86
- 8.1.2 Port Config 87
- 8.1.3 VLAN Config 88
- 8.1.4 Multicast VLAN 89
- ¾ Multicast VLAN 90
- Configuration procedure: 91
- 8.2 Multicast IP 92
- 8.2.2 Static Multicast IP 93
- 8.3 Multicast Filter 94
- 8.3.1 IP-Range 95
- 8.3.2 Port Filter 95
- ¾ Port Filter Config 96
- 8.4 Packet Statistics 97
- Chapter 9 QoS 99
- Figure 9-2 802.1Q frame 100
- Figure 9-3 IP datagram 100
- Figure 9-4 SP-Mode 101
- Figure 9-5 WRR-Mode 101
- 9.1 DiffServ 102
- 9.1.2 802.1P/CoS Mapping 103
- 9.1.3 DSCP Priority 104
- 9.1.4 Schedule Mode 105
- 9.2 Bandwidth Control 106
- 9.2.2 Storm Control 107
- 9.3 Voice VLAN 108
- ¾ Port Voice VLAN Mode 109
- 9.3.1 Global Config 110
- 9.3.2 Port Config 111
- 9.3.3 OUI Config 112
- Chapter 10 ACL 114
- 10.1.3 MAC ACL 115
- 10.1.4 Standard-IP ACL 116
- 10.1.5 Extend-IP ACL 116
- 10.2 Policy Config 117
- 10.2.2 Policy Create 118
- 10.2.3 Action Create 118
- 10.3 Policy Binding 119
- 10.3.2 Port Binding 120
- 10.3.3 VLAN Binding 120
- Configuration Procedure: 121
- ¾ Network Diagram 122
- ¾ Configuration Procedure 122
- Chapter 11 SNMP 124
- ¾ MIB Introduction 125
- 11.1 SNMP Config 126
- 11.1.2 SNMP View 127
- 11.1.3 SNMP Group 127
- ¾ Group Config 128
- 11.1.4 SNMP User 129
- ¾ User Config 130
- ¾ User Table 130
- 11.1.5 SNMP Community 131
- 11.2 Notification 133
- 11.3 RMON 134
- 11.3.1 History Control 135
- 11.3.2 Event Config 136
- 11.3.3 Alarm Config 136
- ¾ Alarm Table 137
- Chapter 12 Maintenance 139
- 12.2 Log 140
- 12.2.1 Log Table 141
- 12.2.2 Local Log 142
- 12.2.3 Remote Log 143
- 12.2.4 Backup Log 143
- 12.3 Device Diagnostics 144
- 12.4 Network Diagnostics 145
- 12.4.1 Ping 146
- 12.4.2 Tracert 146
- ¾ Tracert Config 147
- Appendix A: Specifications 148
- Figure B-1 149
- Appendix C: Glossary 151
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