Shutdown a system by MAC?

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Top Forums Shell Programming and Scripting Shutdown a system by MAC?
# 8  
Old 11-28-2007
Originally Posted by deaconf19
if the server that is idle get a different IP and the primary crashes how do we get the secondary to have the same IP as the primary?
(1) change the DHCP server dhcpd.conf or whereever, so if this server reboots it gets the correct address

(2) "ifconfig if-name inet new-address" on the server to change it immediately
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ETHERS(5)						      BSD File Formats Manual							 ETHERS(5)

ethers -- Ethernet host name data base DESCRIPTION
The ethers file maps Ethernet MAC addresses to host names. Lines consist of an address and a host name, separated by any number of blanks and/or tab characters. A '#' character indicates the beginning of a comment; characters up to the end of the line are not interpreted by routines which search the file. Each line in ethers has the format: ethernet-MAC-address hostname-or-IP Ethernet MAC addresses are expressed as six hexadecimal numbers separated by colons, e.g. "08:00:20:00:5a:bc". The functions described in ethers(3) and ether_aton(3) can read and produce this format. The traditional use of ethers involved using hostnames for the second argument. This may not be suitable for machines that don't have a com- mon MAC address for all interfaces (i.e., just about every non Sun machine). There should be no problem in using an IP address as the second field if you wish to differentiate between different interfaces on a system. FILES
/etc/ethers The ethers file resides in /etc. SEE ALSO
ethers(3) HISTORY
The ethers file format was adopted from SunOS and appeared in NetBSD 1.0. BUGS
A name server should be used instead of a static file. BSD
November 7, 2000 BSD