SENA Parani-MSP1000 - Manual (Page 21)

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usually easier to remember. The DNS server is the host that can translate such text-based domain
names into the numeric IP addresses for a TCP/IP connection.
The IP address of the DNS server must be able to access the host site with the provided domain
name. The Parani-MSP1000 provides the ability to configure the required IP addresses of both the
Primary and Secondary DNS servers addresses. (The secondary DNS server is specified for use
when the primary DNS server is unavailable.)
3.1.1.2. When using Dynamic Host Configuration Protocol (DHCP)
Dynamic Host Configuration Protocol (DHCP) is a communications protocol that lets network
administrators manage and automate the assignment of IP addresses centrally in an organization’s
network. DHCP allows the network administrator the ability to supervise and distribute IP addresses
from a central point and automatically send a new IP address when a computer is plugged into a
different network location.
When in static IP mode, the IP address must be entered manually at each computer. If a computer is
moved to another network location, a new IP address must be assigned. DHCP allows all the
parameters, including the IP address, subnet mask, gateway and DNS servers to be automatically
configured when the IP address is assigned. DHCP uses a “lease” concept in assigning IP
addresses to a computer. It limits the amount of time a given IP address will be valid for a computer.
All the parameters required to assign an IP address are automatically configured on the DHCP server
side, and each DHCP client computer receives this information when the IP address is provided at its
boot-up.
Each time the device is reset, the Parani-MSP1000 broadcasts a DHCP request over the network. The
reply generated by the DHCP server contains the IP address, as well as the subnet mask, gateway
address, DNS servers and the “lease” time. The Parani-MSP1000 immediately places this information
in its memory. Once the “lease” expires, the Parani-MSP1000 will request a renewal of the “lease”
time from the DHCP server. If the DHCP server approves the request for renewal, the Parani-
MSP1000 can continue to work with the current IP address. If the DHCP server denies the request for
renewal, the Parani-MSP1000 will start the procedure to request a new IP address from the DHCP
server.
Note: While in DHCP mode, all network-related parameters for the Parani-MSP1000 should be
configured automatically, including the DNS servers
A DHCP sever assigns IP addresses dynamically from an IP address pool, which is managed by the
network administrator. This means that the DHCP client, i.e. the Parani-MSP1000, receives a different
IP address each time it boots up. The IP address should be reserved on the DHCP server side to
assure that the user always knows the newly assigned Parani-MSP1000 address. In order to reserve
the IP address in the DHCP network, the administrator needs the MAC address of the Parani-
MSP1000 found on the label sticker at the bottom of the Parani-MSP1000.