Some time ago I noticed that I could no longer boot a remote machine via Wake-on-LAN. This annoyed me quite a bit, as the machine was 2100km away and there was nobody at that location who could boot it for me. I really had no clue why it stopped working. So when I recently arrived at the location again, I started looking into it. Everything I had previously configured was still in place. The BIOS option Power On by PCIE devices was enabled, and I still had this in /etc/local.d/wol.start:
#!/bin/sh
ethtool -s eth0 wol g
echo "GBE" > /proc/acpi/wakeup
Yet, when I ran ethtool eth0, it showed that WOL was disabled: