APC ACRP100 User Manual

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 cooling unit.

•  Subnet Mask (option 1): The Subnet Mask value that the cooling unit needs to operate on the 

network.

•  Router, i.e., Default Gateway (option 3): The default gateway address that the cooling unit needs 

to operate on the network.

•  IP Address Lease Time (option 51): The time duration for the lease of the IP Address to the 

cooling unit.

•  Renewal Time, T1 (option 58): The time that the cooling unit 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 cooling unit must wait after an IP address 

lease is assigned before it can seek to rebind that lease.

The cooling unit also uses the following 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 cooling unit can use.

•  Time Offset (option 2): The offset of the cooling unit'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 cooling unit can use.

•  Host Name (option 12): The host name that the cooling unit will use (32-character maximum 

length).

•  Domain Name (option 15): The domain name that the cooling unit 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 an APC user configuration file (.ini file) to download. The siaddr field 
of the DHCP response specifies the IP address of the server from which the cooling unit will 
download the .ini file. After the download, the cooling unit uses the .ini file as a boot file to 
reconfigure its settings.

The Port Speed setting defines the communication speed of the TCP/IP port.

•   For  Auto-negotiation (the default), Ethernet devices negotiate to transmit at the highest possible 

speed, but if the supported speeds of two devices are unmatched, the slower speed is used.

•  Alternatively, you can choose either 10 Mbps or 100 Mbps, each with the option of half-duplex 

(for communication in only one direction at a time) or full-duplex (for communication 
simultaneously in both directions on the same channel).