rhel 4 linux WOL wake on lan Post: 302288700

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Operating Systems Linux rhel 4 linux WOL wake on lan Post 302288700 by Bloke on Tuesday 17th of February 2009 06:03:52 PM

02-17-2009

Registered User

rhel 4 linux WOL wake on lan

Hi guys,

Two boxes on the same .23 subnet 192.168.1.x
The box I wanted to shutdown and restart remotely
went down, but didn't come back up when I used ether-wake 00:11:22:etc:etc:
The sleeper has two nics, but only one with cable. I configured both nics to wake on lan using the g option.
The sleeper is an IBM 336

I thought I'd setup the remoteMachine, by using ethertool to set Wake-on to g, which is supposed to mean it'll repond to the MagicPacket.

The thing is, I wasn't able to get a monitor onto the sleeper, or a keyboard,
so I had to pull the power cable to get it backup. Not great you'll agree.

So, with the above information in mind, where would you start in order to figure out why my ether-wake isn't waking the sleeper?

I even modifed the sleepers /etc/init.d directory so that it contains an executable file called wol.sh, but as the sleeper didn't reboot, I'm not sure that even worked. Do I have to do something with chkconfig so that my ethtool tweak is persistent?

Many questions, any help, as always, is very much appreciated.

The reason I'm doing this:
We have an electricity bill we'd like to reduce.
Is using wake on lan a good idea, or something to be avoided.
I'm looking for the voice of experience, to help me stand on the shoulders of giants.

Last edited by Bloke; 02-18-2009 at 08:14 AM..

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LEARN ABOUT DEBIAN

etherwake

ETHERWAKE(8)						      System Manager's Manual						      ETHERWAKE(8)

NAME

       etherwake - A tool to send a Wake-On-LAN "Magic Packet"

SYNOPSIS

       etherwake [options] Host-ID

DESCRIPTION

       This manual page documents the usage of the ether-wake command.

       etherwake  is  a program that generates and transmits a Wake-On-LAN (WOL) "Magic Packet", used for restarting machines that have been soft-
       powered-down (ACPI D3-warm state). It generates the standard AMD Magic Packet format, optionally with  a  password  included.   The  single
       required  parameter  is	a station (MAC) address or a host ID that can be translated to a MAC address by an ethers(5) database specified in
       nsswitch.conf(5)

OPTIONS

       etherwake needs a single dash ('-') in front of options.  A summary of options is included below.

       -b     Send the wake-up packet to the broadcast address.

       -D     Increase the Debug Level.

       -i ifname
	      Use interface ifname instead of the default "eth0".

       -p passwd
	      Append a four or six byte password to the packet. Only a few adapters need or support this. A six byte password may be specified	in
	      Ethernet	hex format (00:22:44:66:88:aa) or four byte dotted decimal (192.168.1.1) format.  A four byte password must use the dotted
	      decimal format.

       -V     Show the program version information.

EXIT STATUS

       This program returns 0 on success.  A permission failures (e.g. run as a non-root user) results in an exit status of  2.   Unrecognized	or
       invalid	parameters  result  in	an exit status of 3.  Failure to retrieve network interface information or send a packet will result in an
       exit status of 1.

SEE ALSO

       arp(8).

SECURITY

       On some non-Linux systems dropping root capability allows the process to be dumped, traced or debugged.	If someone  traces  this  program,
       they get control of a raw socket.  Linux handles this safely, but beware when porting this program.

AUTHOR

       The etherwake program was written by Donald Becker at Scyld Computing Corporation for use with the Scyld(tm) Beowulf System.

Scyld								  March 31, 2003						      ETHERWAKE(8)