Chapter 25 Dhcp Server Screening Command List - D-Link DGS-3120-48PC Reference Manual

xStack
Chapter 25
config filter dhcp_server [add permit server_ip <ipaddr> {client_mac <macaddr>} ports
[<portlist> | all] | delete permit server_ip <ipaddr> {client_mac <macaddr>} ports [<portlist> |
all] | ports [<portlist> | all] state [enable | disable] | illegal_server_log_suppress_duration [1min
| 5min | 30min ]]
show filter dhcp_server
config filter dhcp_server log [enable | disable]
config filter dhcp_server trap [enable | disable]
25-1 config filter dhcp_server
Description
This command is used to configure DHCP server screening.
With DHCP server screening function, illegal DHCP server packet will be filtered. This command is
used to configure the state of the function for filtering of DHCP server packet and to add/delete the
DHCP server/client binding entry.
This command is useful for projects that support per port control of the DHCP server screening
function. The filter can be based on the DHCP server IP address, or based on a binding of the
DHCP server IP and client MAC address.
The command has two purposes: To specify to filter all DHCP server packets on the specific port
and to specify to allow some DHCP server packets with pre-defined server IP addresses and client
MAC addresses. With this function, we can restrict the DHCP server to service specific DHCP
clients. This is useful when two DHCP servers are present on the network, one of them provides
the private IP address, and one of them provides the IP address.
Enabling filtering of the DHCP server port state will create one access profile and create one
access rule per port (UDP port = 67). Filter commands in this file will share the same access profile.
Addition of a permit DHCP entry will create one access profile and create one access rule. Filtering
commands in this file will share the same access profile.
Format
config filter dhcp_server [add permit server_ip <ipaddr> {client_mac <macaddr>} ports
[<portlist> | all] | delete permit server_ip <ipaddr> {client_mac <macaddr>} ports [<portlist>
| all] | ports [<portlist> | all] state [enable | disable] | illegal_server_log_suppress_duration
[1min | 5min | 30min ]]
Parameters
add permit - Specify to add a DHCP permit.
server_ip - The IP address of the DHCP server to be filtered.
<ipaddr> - Enter the DHCP server IP address here.
client_mac - (Optional) The MAC address of the DHCP client.
<macaddr> - Enter the DHCP client MAC address here.
ports - The port number of filter DHCP server.
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DGS-3120 Series Managed Switch CLI Reference Guide
DHCP Server Screening
Command List
254