Linux wake on lan enable

Бред, это просто название протокола, RFC863.

Если на компьютере несколько сетевых карт обязательно нужно указать в параметр -i адрес

Например, если нужно разбудить комп с адресом 192.168.2.34 в сети 192.168.2.0/24 то можно так и указать например широковещательный адрес сети

Источник

Linux wake on lan enable

Как настроить Wake On Lan в Linux-01

Всем привет сегодня расскажу как настроить Wake On Lan в Linux.

WakeOnLan (WOL) — это технология позволяющая включить компьютер, методом отправки на него специального пакета данных, называемыми Magic Packet. Принцип работы этой технологии таков, что при выключении компьютера он переходит в дежурный режим и переводит сетевую карту в режим пониженного потребления, просматривая все поступающие пакеты из сети. Если сетевой адаптер обнаружит Magic Packet, он выдаст сигнал на включение компьютера. Примечание: для использования данной технологии необходима поддержка данной функции (технологии) сетевым адаптером, почти все современные сетевые адаптеры поддерживают данную технологию.

В данном посте мы рассмотрим настройку данной функции на примере ОС Linux.

1. В первую очередь мы просмотрим список наших сетевых интерфейсов используя утилиту ethtool:
ifconfig

В ответ получим список наших используемых сетевых интерфейсов (в моём случае он 1):

eth0 Link encap:Ethernet HWaddr 6c:62:6d:f0:ce:b4
inet6 addr: fe80::6e62:6dff:fef0:ceb4/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:4528 errors:0 dropped:0 overruns:0 frame:0
TX packets:491 errors:0 dropped:0 overruns:0 carrier:1
collisions:0 txqueuelen:1000
RX bytes:686281 (670.1 KiB) TX bytes:61590 (60.1 KiB)

Нам необходим интерфейс который имеет доступ к внешней сети (в моём случае eth0). Теперь проверим поддерживает ли сетевой адаптер данную технологию и настроим её используя утилиту ethtool. Устанавливаем её:
apt-get install ethtool — для Debian
yum install ethtool — для CentOS

и запустим её, для просмотра информации о сетевом интерфейсе:
ethtool eth0

В ответ мы получим всю информацию о нашем сетевом интерфейсе:

Settings for eth0:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Advertised link modes: Not reported
Advertised pause frame use: No
Advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
MDI-X: Unknown
Supports Wake-on: pg
Wake-on: d
Current message level: 0x0000003f (63)
drv probe link timer ifdown ifup
Link detected: yes

Где Supports Wake-on: pg — означает что наш сетевой интерфейс поддерживает технологию Wake On Lan, Wake-on: d — но она отключена.

Wake On Lan можно включить вручную 1 командой, но при каждой перезагрузке нашей машины он будет деактивироватся, для этого мы создадим и будем использовать специальный скрипт.
Для этого выполняем следующее:
cd /etc/init.d/
nano wakeonlanconfig

Добавляем в скрипт строки:
#!/bin/bash
ethtool -s eth0 wol g
exit

Даём права скрипту:
chmod a+x wakeonlanconfig

Создаём символическую ссылку и делаем наш скрипт исполняемым:
update-rc.d -f wakeonlanconfig defaults

Проверяем что всё нормально вводим команду:
/etc/init.d/wakeonlanconfig

Если ничего в ответ не получили, значит всё хорошо и можно проверить на практике.

Вот так вот просто настроить Wake On Lan в Linux

Источник

Enabling Wake-On-LAN (In Ubuntu 20.10)

Table of Contents

Note: The systemd configuration here isn’t quite right, but since this post is kind of long and convoluted I made a standalone update about the systemd configuration file in this post.

Beginning

These are my notes on getting Wake-On-LAN working in Ubuntu 20.10. I have a server that I use to run most of the computation on when I use emacs/jupyter but I have it in a corner upstairs and although it’s only a little walk, I find that the fact that I have to stop what I’m doing and go upstairs to push that little button on the front makes me lazy and so it ends up running more than it has to so I thought I’d enable Wake-On-LAN so I can suspend it and wake it up whenever I need to. I’m only going to use suspend (APM S3). When I tried to use hibernate (S4) it ended up shutting down my machine (S5). Interestingly, my BIOS menu has an option to enable waking up from shutdown, but since my disk is encrypted, and I didn’t set up a separate SSH server, I have to go enter the passphrase to unlock the disk before the operating system can boot up, so it kind of defeats its own purpose.

Middle

Ethtool

The command I used to set up Wake-On-LAN on the remote machine is called ethtool. It’s in the Ubuntu repositories but wasn’t installed on my machine so I had to add it.

Checking the Interface

From what I’ve read, not all ethernet interfaces support Wake-On-LAN (although I’ve never seen one that doesn’t) so a quick check might be useful. First, find the name of your ethernet interface.

My machine shows four interfaces so I’ll just show the output for the interface I’m interested in rather than the whole output for the command.

Ethtool uses the name of the interface, in this case it’s enp4s0 , so we’ll need to note that. Additionally, the machine that I used to wake up the machine needs the MAC address ( 38:d5:47:79:ab:0b ) so it’d be useful to write that down someplace. I’m waking it up from the LAN so the IP address isn’t so important, and to be able to SSH into it I need to know it anyway, so it’s really those two pieces of information that I need. Now to check if it supports Wake-On-LAN.

Ethtool will give you some information if you don’t run it as root but for Wake-On-LAN you need to run it as root. The important lines in the output is near the bottom and it looks something like this if it supports Wake-On-LAN.

The man-page for ethtool tell you what that cryptic pumbg means — the letters are different options that this interface supports for Wake-On-LAN. In this case they are:

There’s an additional option which is what the interface was set on – d – as you can see in the last line of the output. This means Disable (wake on nothing). This option clears all previous options. I don’t have many devices on my network, so I don’t know that there’s a lot of broadcasts, multicasts, etc. that would be waking it up all the time, but since one feature of Wake-On-LAN is that it only wakes the machine when it gets the «Magic Packet», only the g and d options matter. Now that I knew it was supported, it was time to try it out.

Turn It On Temporarily

The ethtool will turn on Wake-On-LAN, but (supposedly) everytime you reboot the machine it will reset to disabled. I haven’t really tested this out, but I’ll document how to make it permanent later, anyway.

So, as you might guess, we changed the Wake-On-LAN setting to listen for MagicPacket messages. You can check using the ethtool again.

The Wake-on line should have changed to:

Now to suspend the machine so we can test it out.

Test It Out

Now, on my local machine I needed to install wakeonlan. There’s a surprising number of programs to send the Magic Packet, but this just happened to be the one I used.

The default way to use wakeonlan is apparently to just pass it the MAC address of the computer to wake up, and it will send the Magic Packet out as a broadcast, so that’s what I did.

And then I pinged the machine and I waited. And I waited. And I waited… Eventually I went upstairs and saw that it was still sleeping so I pushed the power button to wake it up and went back downstairs.

Take Two

Something wasn’t right so I SSHd into the server and started up tcpdump to see if the packets were going through.

Which gave me this output:

And then I sent the Magic Packet again.

…And nothing happened. For some reason the packets weren’t getting picked up by the machine. Luckily, wakeonlan lets you pass in an IP address as an option. The man page recommends using a broadcast address, but I have the IP addresses of my machines on the LAN reserved on my router/access-point so I just passed in the full address (I did try the LAN broadcast and it worked too).

I have my machine’s IP address aliased in my /etc/hosts file so erebus is just an alias for the machine’s IP address. The subnet broadcast version looked like this.

The output from tcpdump for the first packet looked like this.

So, something was different. I suspended the machine again and sent the Magic Packet and this time it worked. Go figure.

Making It Permanent

Set It Up

The reasons that I said earlier that the Wake-On-LAN setting «supposedly» is temporary is that:

1. I haven’t really re-booted that machine to test it out (I have rebooted, but I haven’t disable the systemd service that I’m documenting here).
2. The machine that I’m typing this on had Wake-On-LAN enabled and it doesn’t have a systemd service enabled.

But, really, I don’t remember even enabling Wake-On-LAN on this machine so maybe it just was the default and I didn’t realise it… another thing I should look into one of these days. Anyway, to make a service that always enables Wake-On-LAN the first step is to find the path to ethertool .

In my case the path was /sbin/ethtool , so once you know this you can create a file at /etc/systemd/system/wol.service (I think you can use another systemd sub-folder, and you can name the file anything you want, within reason, but this one seems to work well enough). In this file you put settings that look something like this:

The only thing specific to my machine is enp4s0 , the name of the ethernet interface, although it’s possible that the path to the ethtool executable might be different too… but it should be the same on Ubuntu 20.10, anyway.

Enable The Service

To enable it you can do this:

Where wol.service is the name of the file you created with the settings. You can check its status if you want.

So, that’s how I got one machine working with Wake-On-LAN. Hopefully I won’t have to look so hard the next time. Here’s the pages that I stole this from.

• TechRepublic on using ethtool and setting up a systemd service for this (don’t use the systemd file here, though).
• Stack Overflow on how to suspend and hibernate from the command-line
• Stack Overflow on what the difference is between suspend and hibernate
• Stack Overflow on using tcpdump to look for the Magic Packets on the remote machine
• Stack Overflow on editing remote files as root with emacs (not documented here, but maybe later)
• Stack Overflow on editing a local file as root with emacs (not used here, but I can never remember the syntax)

Источник

Ubuntu Linux: Install Wake On Lan Client For Server

Ubuntu wake on lan client installation

Open a terminal and type the following command:
$ sudo apt-get install wakeonlan
Sample outputs:

How do I use wakeonlan client?

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Examples

Type the following command to wakeup a nas server called nas01 with 00:08:9b:c4:30:30 as mac address, enter:
$ wakeonlan 00:08:9b:c4:30:30
Sample outputs:

To use a subnet broadcast address:
$ wakeonlan -i 192.168.1.255 00:08:9b:c4:30:30
You can use another destination port:
$ wakeonlan -i 192.168.1.255 -p 2345 00:08:9b:c4:30:30
Finally, you can use a file as source of hardware and IP addresses:
$ wakeonlan -f

See also

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