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61UPS Network Management Card 2 User’s Guide
DHCP response options
Each valid DHCP response contains options that provide the TCP/IP settings that the Management Card
needs to operate on a network, and other information that affects the operation of the Management Card.
Vendor Specific Information (option 43). The Management Card uses this option in a DHCP
response to determine whether the DHCP response is valid. This option contains an APC-specific option
in a TAG/LEN/DATA format, called the APC Cookie. This is disabled by default.
• APC Cookie. Tag 1, Len 4, Data “1APC”
Option 43 communicates to the Management Card that a DHCP server is configured to service
APC devices.
Following, in hexadecimal format, is an example of a Vendor Specific Information option that
contains the APC cookie:
Option 43 = 0x01 0x04 0x31 0x41 0x50 0x43
TCP/IP options. The Management Card uses the following options within a valid DHCP response to
define its TCP/IP settings. All of these options except the first are described in RFC2132.
• IP Address (from the yiaddr field of the DHCP response, described in RFC2131): The IP
address that the DHCP server is leasing to the Management Card.
• Subnet Mask (option 1): The Subnet Mask value that the Management Card needs to operate on
the network.
• Router, i.e., Default Gateway (option 3): The default gateway address that the Management Card
needs to operate on the network.
• IP Address Lease Time (option 51): The time duration for the lease of the IP Address to the
Management Card.
• Renewal Time, T1 (option 58): The time that the Management Card must wait after an IP address
lease is assigned before it can request a renewal of that lease.
• Rebinding Time, T2 (option 59): The time that the Management Card must wait after an IP
address lease is assigned before it can seek to rebind that lease.
Other options. The Management Card also uses these options within a valid DHCP response. All of
these options except the last are described in RFC2132.
• Network Time Protocol Servers (option 42): Up to two NTP servers (primary and secondary)
that the Management Card can use.
• Time Offset (option 2): The offset of the Management Card's subnet, in seconds, from
Coordinated Universal Time (UTC).
• Domain Name Server (option 6): Up to two Domain Name System (DNS) servers (primary and
secondary) that the Management Card can use.
• Host Name (option 12): The host name that the Management Card will use (32-character
maximum length).
• Domain Name (option 15): The domain name that the Management Card will use (64-character
maximum length).
• Boot File Name (from the file field of the DHCP response, described in RFC2131): The fully
qualified directory-path to a user configuration file (.ini file) to download. The siaddr field of the
DHCP response specifies the IP address of the server from which the Management Card will