Dhcp Server Screening; Dhcp Server Screening Port Settings - D-Link xStack DES-3200 Series Reference Manual

The fields that can be configured are described below:
Parameter
NetBIOS Filtering Ports
Extensive NetBIOS
Filtering Ports
Ports
Click the Select All button to select all ports.
Click the Clear All button to deselect all ports.
Click the Apply button to accept the changes made for each individual section.

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.
To view this window, click Security > DHCP Server Screening > DHCP Server Screening Port Settings as
shown below:
xStack® DES-3200 Series Layer 2 Managed Fast Ethernet Switch
Figure 8-46 NetBIOS Filtering Settings window
Description
Select the appropriate port to include in the NetBIOS filtering configuration.
Select the appropriate port to include in the Extensive NetBIOS filtering
configuration. Extensive NetBIOS is NetBIOS over 802.3. The Switch will deny the
NetBIOS over 802.3 frame on these enabled ports.
Tick the appropriate ports to be configured.
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