Tp-Link T1600G-28PS (TL-SG2424P) [548/754] Network security

Tp-Link T1600G-28PS (TL-SG2424P) [548/754] Network security
Configuration Guide 526
Configuring Network Security Network Security
1
Network Security
1.1 Overview
Network Security provides multiple protection measures for the network. Users can configure the
security functions according to their needs.
1.2 Supported Features
The switch supports multiple network security features, for example, IP-MAC Binding, DHCP Snooping,
ARP Inspection and so on.
IP-MAC Binding
IP-MAC Binding is used to bind the IP address, MAC address, VLAN ID and the connected port
number of the specified host. Based on the IP-MAC binding table, the switch can filter the illegal
ARP packets with the ARP Detection feature, so as to prevent the network from ARP cheating
attacks.
The binding entries can be manually configured, or learned by ARP scanning or DHCP snooping.
DHCP Snooping
DHCP Snooping supports the basic DHCP security feature and the Option 82 feature.

Basic DHCP Security
During the working process of DHCP, generally there is no authentication mechanism between
the DHCP server and the clients. If there are several DHCP servers on the network, security
problems and network interference will happen. DHCP Snooping resolves this problem.
As the following figure shows, the port connected to the legal DHCP server is configured as
a trusted port, and other ports are configured as untrusted ports. When receiving the DHCP
discover or DHCP request packets, the switch forwards them to the legal DHCP server only
through the trusted port. When receiving the respond packets, the switch will determine whether
to send or not depending on the type of receiving port: packets received from the trusted port
will be forwarded, otherwise they will be discarded. DHCP Snooping ensures that users get IP
addresses only from the legal DHCP server, enhancing the network security.

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