[lug] OT: Wake On Lan

[D. Stimits]

Sexton, George wrote:
> It's far more likely that you have your BIOS set to power on after power
> fail. Then, whenever you hit a power blink, the machine is powering itself
> on.


Hmm...this seems like a very likely possibility. He has a surge 
protector, but not UPS. However, it never powered on before adding the 
ethernet card and connecting it to the network. So far it has not 
powered up while the network cable is removed, but that could be 
coincidence. And until we turned off the WOL in the BIOS, it would start 
up by itself if we unplugged the ethernet cable then plugged it back in. 
With WOL off in the BIOS, we can unplug and re-plug the network cable, 
and it does not power itself on. I can see the possibility that a power 
blink to the main line might trigger something that eth cable 
remove/re-connect does not trigger; whatever it is though, it did not 
happen before the ethernet card was added, and it has run for over a 
year before this. I think I need to look closer and see what kind of 
power-up-upon-power-restore options might be non-WOL options.

D. Stimits, stimits AT attbi.com

> 
> WOL works by sending the MAC address of the destination NIC. The MAC Address
> has to be repeated something like 12 times.
> 
> George Sexton
> MH Software, Inc.
> Voice: 303 438 9585
> http://www.mhsoftware.com
> 
> 
> -----Original Message-----
> From: lug-admin at lug.boulder.co.us [mailto:lug-admin at lug.boulder.co.us]On
> Behalf Of D. Stimits
> Sent: 27 August, 2002 12:07 PM
> To: BLUG
> Subject: [lug] OT: Wake On Lan
> 
> 
> I am wondering if anyone here is familiar with how Wake On Lan (WOL) is
> communicated? In this case, it is the Linksys LNE100TX, ver. 5.1, but
> perhaps there are common ways to implement this.
> 
> For one, is there a specific port used, or maybe a broadcast message?
> Also, does this WOL feature detect when an ethernet cable has been
> connected (I know the local switch/hub detects this), and run WOL just
> by detecting a new physical connection?
> 
> My motive for asking this is that one machine in the newly wired house
> sometimes spontaneously turns on. WOL has been turned off in the BIOS as
> far as I can tell (the card is not integrated, so the BIOS may not have
> complete control). The system (use the word loosely) is Win98 on fairly
> modern hardware. I am trying to figure out why it can sometimes reboot.
> Originally it was found to do this when turning off power on the bridge
> and switch (testing UPS software), but on rare occasions it does this at
> other times. My hope is that there is something I can use the Linux
> filtering bridge for to at least remove all Internet influences, and
> narrow the debugging down to the LAN or machine itself.
> 
> D. Stimits, stimits AT attbi.com
> 
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