Crude Wake-on-LAN idea

Projects General Guidance
1

I was bored and decided to try a crude way to do a WOL hard restart. As in say the remote system is frozen and needs to power cycle. I took a old system I didn't care about and tried snipping the power latching wire (green wire) to see if the system turned off. In theory it would and sure enough it did. However when reconnected it powered back up with out having to hit the power switch. Best I can tell the power supply was off except the 5 volt standby so the power is still latched. This could work great for a quick and dirty WOL alternative. When I have some extra time I'll probe it with my multi-meter and try adding my Arduino with eth shield to it and give it a shot.

2

Are you talking about the green wire in the RJ45 connector. If so that has absolutely nothing to do with power.

3

I guess OP means the green wire in the ATX-cable bundle. It is pulled down to GND by the motherboard when the system is powered on. Disconnecting this will power down a running system. It has absolutely nothing to do with WOL...

// Per.

4

Zapro:
I guess OP means the green wire in the ATX-cable bundle. It is pulled down to GND by the motherboard when the system is powered on. Disconnecting this will power down a running system. It has absolutely nothing to do with WOL...

It certainly hasn't. The concept of just cutting the power to put the computer "to sleep" and then "waking it up" by enabling power again, is hardly a good idea.

5

He is actually referring to crash recovery.

6

Paul__B:
He is actually referring to crash recovery.

So it's CROL? (Crash recovery on Lan) :slight_smile:

7

Using Arduino Yun:

opkg update
opkg install etherwake
etherwake 90:A2:DA:F8:06:76

This would wake the host with the MAC address 90:A2:DA:F8:06:76.

etherwake: You can wake up WOL compliant Computers which have been powered down to sleep mode or start WOL compliant Computers with a BIOS feature. WOL is an abbreviation for Wake-on-LAN. It is a standard that allows you to turn on a computer from another location over a network connection. ether-wake also supports WOL passwords.

etherwake 90:A2:DA:F8:06:76 -p 00:22:44:66:88:aa

Wake up host with password "00:22:44:66:88:aa".

8

sonnyyu:
This would wake the host with the MAC address 90:A2:DA:F8:06:76.

Not if it's crashed :stuck_out_tongue: