Installation Manual

Installation Manual
12
DHCP. You can use an RFC2131/RFC2132-compliant DHCP server to configure
the TCP/IP settings for the Network Management Card (NMC 2).
This section summarizes the NMC’s communication with a DHCP
server. For more detail about how a DHCP server can configure the
network settings for a Network Management Card, see the NMC 2
User’s Guide on the Utility CD or on the website.
1. The NMC 2 sends out a DHCP request that uses the following to identify
itself:
– A Vendor Class Identifier (APC by default)
– A Client Identifier (by default, the MAC address of the NMC 2)
– A User Class Identifier (by default, the identification of the
application firmware installed on the NMC 2)
2. A properly configured DHCP server responds with a DHCP offer that
includes all the settings that the NMC 2 needs for network communication.
The DHCP offer also includes the Vendor Specific Information option
(DHCP option 43). The NMC 2 can be configured to ignore DHCP offers
that do not encapsulate the APC cookie in DHCP option 43 using the
following hexadecimal format. (The card does not require this cookie by
default).
Option 43 = 01 04 31 41 50 43
where
– the first byte (01) is the code
– the second byte (04) is the length
– the remaining bytes (31 41 50 43) are the APC cookie.
See your DHCP server documentation to add code to the Vendor
Specific Information option.
The NMC 2 Web interface has options to utilize vendor-specific data to
require the DHCP server to provide an “APC” cookie which will supply
information to the NMC 2. See the User’s Guide for information.