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8
Dynamic Host Configuration Protocol (DHCP)
The Dynamic Host Configuration Protocol (DHCP) provides a mechanism for
delivering IP configuration parameters, including IP address, Subnet mask
and default gateway, to devices (hosts) on an IP network. A DHCP server
manages the pool of available IP addresses and grants device requests for
an IP address.
delivering IP configuration parameters, including IP address, Subnet mask
and default gateway, to devices (hosts) on an IP network. A DHCP server
manages the pool of available IP addresses and grants device requests for
an IP address.
At power-up, the NIC broadcasts a DHCP request for an IP address. If a
DHCP server is present the request will be processed, and an IP address
will be returned to the NIC. Upon receipt of the IP address, the NIC resets,
and prints a network status page. The network status page will list the new
IP address (and Subnet mask and default gateway). One an IP address has
been assigned to the NIC; it will no longer broadcast DHCP requests.
Therefore, NIC IP address assignment with DHCP will only work when
the NIC does not have an existing IP address.
DHCP server is present the request will be processed, and an IP address
will be returned to the NIC. Upon receipt of the IP address, the NIC resets,
and prints a network status page. The network status page will list the new
IP address (and Subnet mask and default gateway). One an IP address has
been assigned to the NIC; it will no longer broadcast DHCP requests.
Therefore, NIC IP address assignment with DHCP will only work when
the NIC does not have an existing IP address.
The DHCP server may grant a temporary IP address, called a temporary
lease or temporary reservation, which expires after a period, or may grant a
permanent or unlimited lease or reservation which does not expire.
lease or temporary reservation, which expires after a period, or may grant a
permanent or unlimited lease or reservation which does not expire.
Devices that are granted a temporary lease will be notified before the lease
expires and asked if they would like to extend the lease. The NIC will
continue extending its lease indefinitely (unless prohibited by your DHCP
server configuration) and thus maintain a consistent IP address.
expires and asked if they would like to extend the lease. The NIC will
continue extending its lease indefinitely (unless prohibited by your DHCP
server configuration) and thus maintain a consistent IP address.
IMPORTANT: If the NIC is not turned on or is not connected to the
network during the period when the DHCP server is sending requests
to extend the lease, the lease will not be extended. The DHCP server
will cancel the lease and may assign the IP address to another device.
Therefore, it is highly recommended to explicitly specify the NIC lease
as permanent or unlimited in your DHCP server configuration.
network during the period when the DHCP server is sending requests
to extend the lease, the lease will not be extended. The DHCP server
will cancel the lease and may assign the IP address to another device.
Therefore, it is highly recommended to explicitly specify the NIC lease
as permanent or unlimited in your DHCP server configuration.
If you prefer not to use DHCP for IP address assignment, it may be disabled
with the MAP utility or by connecting to the NIC address with a browser. The
enable/disable DHCP setting may be found in the Setup TCP/IP section under
the Protocols heading.
enable/disable DHCP setting may be found in the Setup TCP/IP section under
the Protocols heading.
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