Dhcp Server Screening; Dhcp Server Screening Port Settings - D-Link xStack DGS-3120 Series Reference Manual

xStack® DGS-3120 Series Layer 3 Managed Gigabit Ethernet Switch Web UI Reference Guide
The fields that can be configured are described below:
Parameter
Port List
Forward Port List
Unit
Click the Apply button to accept the changes made.

DHCP Server Screening

This function allows the user to not only to restrict all DHCP Server packets but also to receive any specified DHCP
server packet by any specified DHCP client, it is useful when one or more DHCP servers are present on the
network and both provide DHCP services to different distinct groups of clients.
The first time the DHCP filter is enabled it will create both an access profile entry and an access rule per port entry,
it will also create other access rules. These rules are used to block all DHCP server packets. In addition to a permit
DHCP entry it will also create one access profile and one access rule entry the first time the DHCP client MAC
address is used as the client MAC address. The Source IP address is the same as the DHCP server's IP address
(UDP port number 67). These rules are used to permit the DHCP server packets with specific fields, which the user
has configured.
When DHCP Server filter function is enabled all DHCP Server packets will be filtered from a specific port.

DHCP Server Screening Port Settings

The Switch supports DHCP Server Screening, a feature that denies access to rogue DHCP servers. When the
DHCP server filter function is enabled, all DHCP server packets will be filtered from a specific port.
Figure 8-67 Traffic Segmentation Settings window
Description
Enter a list of ports to be included in the traffic segmentation setup. Tick the All ports
check box to select all ports.
Enter a list of ports to be included in the traffic segmentation setup. by simply ticking
the corresponding port's tick box. Tick the All ports check box to select all ports.
Select the unit you want to configure. (EI and SI Mode Only)
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