TP-Link T1600G-18TSTL-SG2216 T1600G-18TSUN V1 Configuration Guide - Page 627
Configuration Examples, Example for DHCP Snooping and ARP Detection, Network Requirements,
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Configuring Network Security Configuration Examples 8 Configuration Examples 8.1 Example for DHCP Snooping and ARP Detection 8.1.1 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 8-1 Network Topology Legal DHCP Server Gi1/0/4 Switch A Gi1/0/1 Gi1/0/2 Gi1/0/5 Gi1/0/3 Attacker/Illegal DHCP Server User 1 User 2 User 3 74-D3-45-32-B6-8D 76-D9-33-56-78-A3 88-A9-D4-54-FD-C3 192.168.0.33/24 8.1.2 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. Configuration Guide 604
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