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GS716T and GS724T Gigabit Smart Switches
Services — DHCP Filtering
DHCP Filtering is a useful feature that can be employed as a security measure against
unauthorized DHCP servers. A known attack is when an unauthorized DHCP server
responds to a client that is requesting an IP address. The server configures the gateway for
the client to be equal to the IP address of the server. At that point, the client sends all of its IP
traffic destined to other networks to the unauthorized machine. This gives the attacker the
possibility of snooping traffic for passwords or employing a man-in-the-middle attack. DHCP
Filtering works by allowing the administrator to configure each port as either a trusted port or
an untrusted port. The port that has the authorized DHCP server should be configured as a
trusted port. Any DHCP responses received on a trusted port are forwarded. All other ports
should be configured as untrusted. Any DHCP (or BootP) responses received are discarded.
From the Services link, you can access the following pages:
• DHCP Filtering Configuration on page 76
• Interface Configuration on page 77
DHCP Filtering Configuration
Use the DHCP Filtering Configuration page to enable or disable the DHCP Filtering feature
on the switch.
To access the DHCP Filter Configuration page, click System Services DHCP Filtering
Configuration.
To configure global DHCP filtering settings:
1. In the Admin Mode field, select Enable or Disable to turn the DHCP Filtering feature on
or off.
2. Click Apply to apply the change to the system. Configuration changes take effect
immediately.
3. Click Cancel to cancel the configuration on the screen and reset the data on the screen to
the latest value of the switch.
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