Page 32 of 84 Installing the Agent Greeting Card
NTPH13AA_Install 3.02 September 2006
Assigning the Internet Protocol address
Agent Greeting allows two basic methods of assigning IP addresses to individual
cards. These are static assignment via the Maintenance and Debug Serial Port and
dynamic assignment using Dynamic Host Configuration Protocol (DHCP).
It is recommended that a Static IP address is assigned to the card unless a Reserved
IP address entry can be made in the DHCP server, which will always give the
reserved IP address to the Agent Greeting card.
DHCP IP Address Assignment
DHCP is used to determine the network configuration of each Agent Greeting card
in a dynamic fashion. DHCP aims to reduce the work necessary to administer an IP
network by using a server to allocate network addresses. It is an extension of
BOOTP. DHCP also allows automatic reuse of addresses by specifying a lease time.
Clients must renew the lease periodically.
The client (Agent Greeting Card) first broadcasts a discover message containing its
Ethernet address as a client identifier. A DHCP server then replies with an offer
message, containing configuration parameters. The client can receive offers from
multiple DHCP servers. The client must then select a server by broadcasting a
request message containing the server identifier. The server then acknowledges the
reply and assigns the configuration to the client. The client can now use the assigned
configuration.
The DHCP server should assign a reserved address to the Agent Greeting card to
guarantee that the card always receives the same IP address. Otherwise, the Agent
Greeting card must have an assigned DNS name to ensure that it can always be
found using a Web Browser. If the local DHCP server provides long lease periods,
this may not be necessary.
Static IP Address Assignment
Using static assignment, the operator assigns an IP address, Subnet Mask, and
default Gateway IP address via the serial port interface using the functions
lnIsa_progSubnetMask, lnIsa_progIP, and lnIsa_progGW. These functions set the
Subnet Mask, IP, and default Gateway IP addresses respectively, and store them in
the Non Volatile RAM (NVRAM). On a reboot, the Agent Greeting card will
retrieve the IP information from NVRAM and applies it. To switch to this mode of
IP assignment, the function lnIsaIPMethodSet must be invoked with the parameter
2 (that is, lnIsaIPMethodSet 2). Below is the command sequence to assign a static
IP address to the card.
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