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24-Port Gigabit Ethernet PoE+ Web-Managed Switch with

4 Gigabit Combo Base-T/SFP Ports

User Manual

FAULT/SAFETY

In the navigation bar, select “Fault/Safety” to set options for Anti Attack, Channel Detection, ACL

and 802.1x.

ANTI ATTACK

DHCP SNOOPING

DHCP snooping is a security technology built into the operating system of a capable network switch that

drops DHCP trac determined to be unacceptable. The fundamental use for DHCP snooping is to prevent

unauthorized (rogue) DHCP servers oering IP addresses to DHCP clients.

COMMAND USAGE

Network trac may be disrupted when malicious DHCP messages are received from an outside source.

DHCP snooping is used to lter DHCP messages received on a non-secure interface from outside the

network or rewall. When DHCP snooping is enabled globally and enabled on a VLAN interface, DHCP

messages received on an untrusted interface from a device not listed in the DHCP snooping table will

be dropped.

Table entries are only learned for trusted interfaces. An entry is added or removed dynamically to the DHCP

snooping table when a client receives or releases an IP address from a DHCP server. Each entry includes a

MAC address, IP address, lease time, VLAN identier and port identier. When DHCP snooping is enabled,

DHCP messages entering an untrusted interface are ltered based upon dynamic entries learned via DHCP

snooping.

Intellinet 561426 User Manual

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