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xStack DES-3800 Series Layer 3 Stackable Fast Ethernet Managed Switch
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DHCP Server
For this release of the xStack DES-3800, the Switch now has the capability to act as a DHCP server to devices which are located
in its locally attached networks or relayed by DHCP relay agent. DHCP, or Dynamic Host Configuration Protocol, allows the
switch to delegate IP addresses, subnet masks, default gateways and other IP parameters to devices that request this information.
This occurs when a DHCP enabled device is booted on or attached to the locally attached network. This device is known as the
DHCP client and when enabled, it will emit query messages on the network before any IP parameters are set. When the DHCP
server receives this request, it returns a response to the client, containing the previously mentioned IP information that the DHCP
client then utilizes and sets on its local configurations.
The user can configure many DHCP related parameters that it will utilize on its locally attached network, to control and limit the
IP settings of clients desiring an automatic IP configuration, such as the lease time of the allotted IP address, the range of IP
addresses that will be allowed in its DHCP pool, the ability to exclude various IP addresses within the pool as not to make
identical entries on its network, or to assign the IP address of an important device (such as a DNS server or the IP address of the
default route) to another device on the network.
Users also have the ability to bind IP addresses within the DHCP pool to specific MAC addresses in order to keep consistent the
IP addresses of devices that may be important to the upkeep of the network that require a static IP address.
To begin configuring the DHS-3828 as a DHCP Server, open the L3 Features folder, then the DHCP Server folder which will
display 5 links to aid the user in configuring the DHCP server.
DHCP Server Global Settings
The following window will allow users to globally enable the switch as a DHCP server and set the DHCP Ping Settings to test
connectivity between the DHCP Server and Client. To view this window, click L3 features > DHCP Server > DHCP Server
Global Settings.
Figure 8- 44. DHCP Server Global Settings window
The following parameters may be configured.
Parameter Description
DHCP Server
State
Use the Pull-down menu to globally enable or disable the switch as a DHCP server. If DHCP relay
is enabled, the DHCP server can not be enabled. The opposite is also true.
Ping Packet (0-
10)
Enter a number between 0-10 to denote the number of ping packets that the Switch will send out
on the network containing the IP address to be allotted. If the ping request is not returned, the IP
address is considered unique to the local network and then allotted to the requesting client. The
default setting is 2 packets.
Ping Timeout
(10-2000)
The user may set a time between 10-2000 milliseconds that the Switch will wait before timing out a
ping packet. The default setting is 100 milliseconds.
Click Apply to implement changes made.