Netgear GS724TS-100NAS User Manual download pdf (Page 65)

Chapter 2: Configuring System Information | 65

GS716Tv2 and GS724Tv3 Software Administration Manual

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 65

• Interface Configuration on page 66

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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Netgear GS724TS-100NAS User Manual Page 65