01-26-2007
The hostid uniquely identifies a given server. It is often used for software licensing.
Traditionally, a Sun server hostid was based on the MAC address of the primary on-board network interface. All network interfaces have a unique MAC address and Sun Microsystem's all begin with 08:00:20:xx:xx:xx. By truncating leading zeros your would get 8:0:20:xx:xx:xx displayed by ifconfig(1M).
The hostid starts with "80" -- the first two octets of the MAC address -- followed by six hexadecimal characters representing the last three octets. Thus, a server with a MAC address of 08:00:20:0a:1b:2c would have a hostid of 800a1b2c.
I believe with the newer servers, this is all being done away with and is supported by a "system configuration card" allowing you to take all of this information from one server to another in the event of a major hardware failure.
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LEARN ABOUT DEBIAN
setether
SETETHER(8) System Manager's Manual SETETHER(8)
NAME
setether - Set the ethernet address for use with DECnet
SYNOPSIS
setether <if> [<if>...]|all [options]
DESCRIPTION
Set ethernet MAC address on ethernet adaptors
This script should be run at system startup. It will change the ethernet hardware (MAC) address of any or all ethernet interfaces to match
the DECnet node address. DECnet requires that the MAC address of all ethernet adaptors running the protocol be set approriately. If you do
not run setether then you must change the ethernet address in some other way for DECnet to work.
By default no ethernet interfaces will have their MAC addresses changed by setether, if you specify all then all interfaces name eth* will
be changed, otherwise a list of interface names can be specified. setether will enable (UP) all interfaces it changes the MAC addresses
of.
(2.4 only) The first interface specified on the command-line will also be made the default interface for DECnet operations (ie attempts to
contact nodes not in the neighbour table will be done over this interface).
This script must be run with the interface inactive, it is normally run from /etc/init.d/decnet before TCP/IP starts up.
EXAMPLES
set the MAC address of eth0.
# /sbin/setether eth0
set the MAC address of all ethernet interfaces
# /sbin/setether all
HELPFUL HINTS
If you have multiple ethernet cards on your system and they are connected to the the same network you should specify which one you want to
use for DECnet communication on the setether command line, otherwise they will both be given the same MAC address and this is probably not
what you want.
Running DECnet on multiple ethernet interfaces only works under Linux 2.4. If you are running Linux 2.2 then the interface name on the
setether command line must match the one in /etc/decnet.conf(5).
SEE ALSO
decnet.conf(5), dntype(1), dndir(1), dndel(1), dnetd(8), dnping(1)
DECnet utilities March 01 2001 SETETHER(8)