Table of Contents
Advertisement
Parameter
Description
Enter the name of the DHCP pool within which will be created a manual DHCP binding entry.
Pool Name
IP Address
Enter the IP address to be statically bound to a device within the local network that will be specified
by entering the Hardware Address in the following field.
Hardware
Enter the MAC address of the client to be statically bound to the IP address entered in the previous
Address
field.
Type
This field is used to specify the type of connection for which this manually bound entry will be set.
Ethernet will denote that the manually bound device is connected directly to the Switch, while the
IEEE802 denotes that the manually bound device is outside the local network of the Switch.
Click Apply to set the entry.
DHCP Server Screening
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 DHCP Server
Screening 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.
DHCP Server Screening 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 Administration > Filter DHCP Server > Filter DHCP Server Global Settings, as shown below.
The following parameters may be configured.
Parameter
Description
Trap/Log
Enable this function to record logs and send traps when the Switch detects the illegal DHCP server
packets.
Illegal
Server
The DHCP Server Screening function filters any illegal DHCP server packets. The DHCP server
Log Suppress
who sends the illegal packets will be logged. This command is used to suppress the logging of
Duration
DHCP 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.
®
xStack
DGS-3426G Layer 2 Gigabit Ethernet Managed Switch
Figure 2 - 67 DHCP Server Screening Global Settings window
64
Advertisement
Table of Contents
