D-Link DGS-3120-24TC Product Manual - Page 241
DHCP Server Screening, DHCP Server Screening Port Settings
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xStack® DGS-3120 Series Managed Switch Web UI Reference Guide Figure 8-45 NetBIOS Filtering Settings window The fields that can be configured are described below: Parameter Description NetBIOS Filtering Ports Select the appropriate port to include in the NetBIOS filtering configuration. Ports Tick the appropriate ports that will be included in the NetBIOS filtering configuration. Extensive NetBIOS Filtering Ports 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. Ports Tick the appropriate ports that will be included in the Extensive NetBIOS filtering configuration. 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: 233