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Chapter 2 IPMI Server Management 37
Remote Management Control Protocol is a request-response protocol delivered using
UDP datagrams to port 623. IPMI-over-LAN uses version 1 of the RMCP to support
management both before installing the OS on the server, or if the server will not
have an OS installed.
The LAN interface is an authenticated, multi-session connection; messages delivered
to the BMC can (and should) be authenticated with a challenge/response protocol
with either a straight password/key or an MD5 message-digest algorithm. IPMItool
attempts to connect with administrator privilege level as this is required to perform
chassis power functions.
With the -I option, you can direct IPMItool to use the LAN interface:
# ipmitool -I lan [option...] address password
To use the LAN interface with IPMItool, you must provide a host name on the
command line.
The password field is optional; if you do not provide a password on the command
line, IPMItool attempts to connect without authentication. If you specify a password,
it uses MD5 authentication, if supported by the BMC; otherwise, it will use straight
password/key.
Files
The file /dev/ipmi0 is a character-device file used by the OpenIPMI kernel driver.
Examples
If you want to remotely control the power of an IPMI-over-LAN-enabled server, you
can use the following commands:
#
ipmitool -I lan -H spipaddr -P sppasswd chassis power on
The result returned is:
Chassis Power Control: Up/On
# ipmitool -I lan -H spipaddr -P sppasswd chassis power status
The result returned is:
Chassis Power is on