Owners manual

Rack Power Filter: Using the Network Management Card6
DHCP. You can use an RFC2131/RFC2132-compliant DHCP server to configure the TCP/IP settings for
the Rack Power Filter.
This section summarizes the Rack Power Filter’s communication with a DHCP server. For
more detail about how a DHCP server can configure the network settings for a Rack Power
Filter, see “DHCP response options” on page 61.
1. The Rack Power Filter 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 Rack Power Filter)
– A User Class Identifier (by default, the identification of the application firmware installed on
the Rack Power Filter)
2. A properly configured DHCP server responds with a DHCP offer that includes all the settings
that the Rack Power Filter needs for network communication. The DHCP offer also includes the
Vendor Specific Information option (DHCP option 43). The Rack Power Filter can be configured
to ignore DHCP offers that do not encapsulate the APC cookie in DHCP option 43 using the
following hexadecimal format. (The Rack Power Filter 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.
Note: By selecting the Require vendor specific cookie to accept DHCP Address
check box in the Web interface, you can require the DHCP server to provide an
“APC” cookie, which supplies information to the Rack Power Filter:
Administration > Network>TCP/IP>ipv4 settings.