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2025-05-21 11:43:49 +03:00

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---
slug: make-one-proxmox-node-to-wol-another
title: "Make one Proxmox node to wake-on-lan another"
tags: [self-hosting, homelab, Proxmox, WOL]
image: /img/homelab.png
---
Nothing is eternal, especially the relevance of documentation. I think help.ubuntu.com is an absolute winner, holding the largest number of outdated and irrelevant pages. But that's not a topic for today's post.
One of my Proxmox cluster nodes can't power itself on after the outage. But it supports wake-on-LAN, so I decided that another node could power it on. And the simplicity of this task was overrated by me.
<!-- truncate -->
:::warning
Wake on LAN doesn't work across VLANs. Magic packets could be sent and received only inside a single subnet.
:::
## The victim
First of all, even after enabling "Wake up on PCI event" or something in BIOS it was not working because WoL was still disabled on a software level. It can be checked with:
```bash
ethtool enp1s0
```
Where `enp1s0` is a physical network interface of a Proxmox node, not a bridge.
There should be `Wake-on:` setting among others. In my case it was `Wake-on: d`, which means that wake-on-LAN is disabled, according to `ethtool` documentation:
```
p Wake on phy activity
u Wake on unicast messages
m Wake on multicast messages
b Wake on broadcast messages
a Wake on ARP
g Wake on MagicPacket(tm)
s Enable SecureOn(tm) password for MagicPacket(tm)
d Disable (wake on nothing). This option clears all previous
options.
```
We need to set it to wake by the MagicPacket(tm). We need to create a config file for this to be enabled on system start. But first we need to:
```bash
ip link show enp1s0
```
and write down our network device MAC address. Then create a file:
```bash
nano /etc/systemd/network/90-wakeonlan.link
```
with the next content:
```
[Match]
MACAddress=<mac-address-here>
[Link]
NamePolicy=kernel database onboard slot path
MACAddressPolicy=persistent
WakeOnLan=magic
```
After that we need to reboot and check WOL status again:
```bash
ethtool enp1s0
```
Now `Wake-on` should be set to `g`.
## The one who bothering
On another node we need to install an util that will be sending a magic packet:
```bash
apt update
apt install etherwake
```
Now we can power the victim off and try to wake it with:
```bash
etherwake -i vmbr0 <mac_address>
```
Where `vmbr0` is a bridge network interface of current Proxmox node, and `<mac_address>` is a MAC address of the victim's physical network interface.
If it works, we can now add a cron job to wake our victim upon current node startup, adding some delay to make sure the network is ready:
```bash
crontab -e
```
Cron job line to add:
```
@reboot sleep 30s && /usr/sbin/etherwake -i vmbr0 <mac_address>
```