Filter Dhcp Server; Filter Dhcp Server Global Settings; Filter Dhcp Server Port Settings - D-Link DGS-3600 Series User Manual

Filter DHCP Server

The Dynamic Host Configuration Protocol (DHCP) automates the assignment of IP addresses, subnet masks, default routers, and
other IP parameters. The assignment usually occurs when the DHCP configured machine boots up or regains connectivity to the
network. The DHCP client sends out a query requesting a response from a DHCP server on the locally attached network. The
DHCP server then replies to the client with its assigned IP address, subnet mask, DNS server and default gateway information.
This function allows DHCP server packets except those that have been IP/client MAC bound to be filtered. The Filter DHCP
Server is used to configure the state of the function for filtering of DHCP server packets and to add or delete the DHCP
server/client binding entry. This command has two purposes firstly to filter all DHCP server packets on the specified port(s) and
secondly to allow some DHCP server packets to be forwarded if they are on the pre-defined server IP address/MAC address
binding list. Thus the DHCP server can be restricted to service a specified DHCP client. This is useful when there are two or
more DHCP servers present on a network.

Filter DHCP Server Global Settings

This window is used to enable the settings for the Filter DHCP Server Global Settings on the Switch.
To view this table, click L3 Features > Filter DHCP Server > Filter DHCP Server Global Settings, as shown below.
The following parameters may be configured.
Parameter Description
Trap/Log To Enable or Disable the function for filtering DHCP server packets.
The DHCP server filtering function filters any illegal DHCP server packets. The DHCP server who
Illegal Server
Log Suppress sends the illegal packets will be logged. This command is used to suppress the logging of DHCP
Duration servers who continue to send illegal DHCP packets. The same illegal DHCP server IP address that
is detected will be logged only once regardless of how many illegal packets are sent. The log can
be suppressed by 1 minute, 5 minutes or 30 minutes. The default value is 5 minutes.
Click Apply to implement the changes.

Filter DHCP Server Port Settings

This window is used to enable the settings for the Filter DHCP Server Port Settings.
To view this window, click L3 Features > Filter DHCP Server > Filter DHCP Server Port Settings, as shown below.
®
xStack DGS-3600 Series Layer 3 Gigabit Ethernet Managed Switch
Figure 8- 66. DHCP Server Filter Global Settings window
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