NEC 870 - SuperScript B/W Laser Printer Network User's Manual page 21

Dynamic Host Configuration Protocol
Dynamic Host Configuration Protocol (DHCP) allows
automatic assignment of IP address and other IP
parameters for attached devices. The NIC works with
DHCP in the following way.
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 Settings page. This shows the new IP address
(and subnet mask, and default gateway, if any). Under
factory default settings, once an IP address has been assigned to
it, the NIC 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 later, 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.
Important: If the NIC is not turned on or is not connected to
the network 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.
DHCP Settings in the NIC Home Page
You can control the way the NIC handles DHCP from the
NIC Home Page.
1. On the NIC Home Page, click the Network
Administration button.
2. Under Protocols, click Setup TCP/IP. The two DHCP
Settings are shown here.
The factory default is that both settings are checked.
If there is not an IP address already stored in NVRAM,
the NIC will make a DHCP request. If there is an IP
address, it will not.
When Enable DHCP is not checked, the NIC will not
make DHCP requests.
When IP Address in NVRAM is not checked, the NIC
will always make a new DHCP address request at
startup, regardless of whether or not it has an IP
address stored in NVRAM.
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