xStack
®
DGS-3200 Series Layer 2 Gigabit Ethernet Managed Switch
134
DHCP Offer Filtering
This function allows the user to not only restrict all DHCP Server packets but also to receive any specified DHCP server packet by
any speci fied DHCP cl ient, it i s useful when o ne or more DHC P servers are present on t he network an d both p rovide D HCP
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 al so create other access rules. These rules are used to block all DHCP server packets. In
addition to a permit DHCP e ntry, 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 source
port number 67). These rules are used to permit the DHCP server packets with specific fields, which the user has configured.
To view the following window, click Security > DHCP Server Screening > DHCP Offer Filtering:
Figure 5 - 14. DHCP Offer Filtering window
The user may set the following parameters:
Parameter Description
Server IP Address
The IP address of the DHCP server to be filtered.
Client’s MAC Address
The MAC address of the DHCP client. Only multiple legal DHCP servers on the network
need to be entered in this field. If there is only one legal DHCP server on the network, no
input to this field is allowed.
Ports
The port numbers of the filter DHCP server.
After setting the previous parameters, click
Apply
to allow your changes to be implemented.
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