Dhcp Server Screening - D-Link DGS-3700-12 User Manual

DGS-3700-12/DGS-3700-12G Series Layer 2 Gigabit Ethernet User Manual
This window is used to configure the NetBIOS Filtering Setting.
To view this window, click Security > NetBIOS Filtering Settings, as shown below:
Figure 8- 42 NetBIOS Filtering Settings window
Enter the ports you wish to configure to filter NetBIOS packets from specified ports and click Apply.

DHCP Server Screening

This function allows the user to not only 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.
The DHCP Server Screening folder contains two windows: DHCP Screening Port Settings and DHCP Offer Filtering.
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 Screening Port Settings, as shown below:
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