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Configuration Guide 632
Configuring Network Security
Configuration Examples
9
Configuration Examples
9.1 Example for DHCP Snooping and ARP Detection
9.1.1 Network Requirements
As shown below, User 1 and User 2 get IP addresses from the legal DHCP server, and
User 3 has a static IP address. All of them are in the default VLAN 1. Now, untrusted DHCP
packets need to be filtered to ensure that the DHCP clients (User 1 and User 2) can get the
IP addresses from the legal DHCP server. Additionally, the network needs to be prevented
from ARP attacks.
Figure 9-1
Network Topology
Gi1/0/4
Gi1/0/1
Gi1/0/2
Gi1/0/3
Gi1/0/5
User 3
88-A9-D4-54-FD-C3
192.168.0.33/24
User 1
74-D3-45-32-B6-8D
Attacker/Illegal
DHCP Server
User 2
76-D9-33-56-78-A3
Switch A
Legal DHCP Server
9.1.2 Configuration Scheme
To meet these requirements, you can configure DHCP Snooping to filter the untrusted
DHCP packets from the illegal DHCP server and configure ARP Detection and ARP Defend
to prevent the network from ARP attacks.
The overview of configuration is as follows:
1) Configure DHCP Snooping on Switch A. Set port 1/0/4 that is connected to the legal
DHCP server as the trusted port and other ports as untrusted ports. So that the illegal
DHCP server on any other port cannot assign IP addresses for the clients.
Содержание T2500G-10MPS
Страница 1: ...User Guide T2500G 10MPS 1910012405 REV1 0 1 April 2018...
Страница 24: ...Using the CLI 767 Appendix Default Parameters 773...
Страница 27: ...Part 1 Accessing the Switch CHAPTERS 1 Overview 2 Web Interface Access 3 Command Line Interface Access...
Страница 129: ...Part 4 Configuring LAG CHAPTERS 1 LAG 2 LAG Configuration 3 Configuration Example 4 Appendix Default Parameters...
Страница 145: ...Part 5 Monitoring Traffic CHAPTERS 1 Traffic Monitor 2 Appendix Default Parameters...
Страница 172: ...Part 7 Configuring DDM CHAPTERS 1 Overview 2 DDM Configuration 3 Appendix Default Parameters...
Страница 190: ...Part 8 Configuring L2PT CHAPTERS 1 Overview 2 L2PT Configuration 3 Configuration Example 4 Appendix Default Parameters...
Страница 274: ...Part 13 Configuring GVRP CHAPTERS 1 Overview 2 GVRP Configuration 3 Configuration Example 4 Appendix Default Parameters...
Страница 800: ...Configuration Guide 776 Configuring SNMP RMON Appendix Default Parameters Parameter Default Setting Status Disable...
Страница 803: ...BSMI Notice Pb Cd Hg CrVI PBB PBDE PCB 1 2...