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Section 4 - Chapter 2 - Configuring the OkiLAN 6120e
OKI OkiLAN 6120e User’s Guide
DHCP
The Dynamic Host Configuration Protocol (DHCP)
provides a framework for passing configuration
information to hosts on a TCP/IP network in a client/
server fashion. DHCP is based on the Bootstrap
Protocol (BOOTP), adding the capability of automatic
allocation of reusable network addresses and additional
configuration options. DHCP uses the same packet
structure as BOOTP so current BOOTP relay agents
will also interact with DHCP messages.
DHCP offers dynamic IP address allocation. When a
client receives an IP address, it also receives a lease (an
amount of time the host may use the address). The
lease times vary from 1 hour to 100 years, or may be
infinite. When the lease expires, the host must stop
using the address. DHCP may also be used like
BOOTP, with a certain IP address always assigned to a
certain device. Depending on the server, both methods
may be used at the same time.
If the OkiLAN 6120e does not find a DHCP server
after two minutes, it will timeout and assume a default
address of 198.102.102.254. This follows current
BOOTP and RARP behavior.
If the OkiLAN 6120e receives multiple responses, it
will choose the first one.
When the OkiLAN 6120e receives an address, it sends
an ARP message once every second for five seconds on
the offered address to determine if another device is
using it. If the OkiLAN 6120e finds another device is
using the address, it will refuse the address and start
looking for a new address.