Where contains the letter g, the NIC should support the WoL Magic Packet™ method (for the other letters look at man ethtool). If this output contains a line similar to the following: This command will output some information about your the capabilities of your NIC. Where is the device name of your NIC, e.g. Check your manual to see if yours does and install if necessary.įirst, determine which NIC will be used, and then check whether it supports the Magic Packet™ using PCI NICs sometimes require a cable connection to the power supply in order to stay awake when the computer is off/asleep. Enable the setting that is appropriate for your NIC. In one of the sub-menus there will hopefully be the option to allow USB and/or PCI devices to wake-up the computer. Boot your computer and enter the BIOS settings menu. If your NIC is not integrated into your motherboard, you will still have to configure your BIOS to allow devices to wake up your computer. To enable WoL in the BIOS, enter the BIOS setup and look for something called "Wake up on PCI event", "Wake up on LAN" or similar. This section may differ depending on whether or not you have a NIC integrated into your motherboard. You may also need to configure some software if things don't work out-of-the-box. In order to use WoL it must be supported and enabled as necessary in the BIOS, NIC and other network hardware (routers, switches etc). When the packet is received, the target machine's network device (Network Interface Controller or NIC) wakes-up the rest of the machine. WoL works by sending a packet of data called a Magic Packet™ to the target machine. It can be very useful in situations where computers are not all next to each other or there are a lot of machines. There's a little more ceremony used to parse the arguments provided by the user, but it's not super relevant to this post.Wake-on-LAN enables users to turn on a computer across a network from another network device. Then we pattern match on the result and write an appropriate message to the console. Port 9 is useful because it targets the discard protocol and we don't expect to get a response anyway. When enabled, this socket is allowed to send packets to a broadcast address.įinally we ask the socket to send the &magic_packet to the address 255.255.255.255:9. We create a UDP socket bound to the given address, then we set_broadcast(true), which (from the docs) We could have done this ourselves, but the hex library helps out with error handling fn string_mac_to_bytes ( incoming : & str ) -> Vec ", msg ) That can be achieved fairly simply in Rust with an iterator and using an external library for parsing hex values. The MAC address will be supplied in the common 00:11:22:33:44::55 style and will be converted to bytes internally. The minimal UX I want to provide is a command line application called wol which will take one argument, the MAC address of the target. We're going to send this packet via UDP broadcast across the local network. The final payload we're looking to produce looks like this. Given an example MAC address of 00:1A:BB:CD:EE:61 we can convert that to bytes too. The magic packet is a broadcast frame which contains 6 bytes each of which will be the number 255, followed by the MAC address of the target machine, repeated 16 times.Ĭommonly, 255 would be referred to as FF in hexadecimal, we can convert this to bytes. The way we trigger the behaviour is to send a 'magic packet'. Generally speaking it only working on local networks, which is fine for my purposes. Happily, there's a thing called Wake On LAN which allows you to send a message to hardware that supports this feature. I eventually ran into an issue where I wanted to be able to remotely wake the Mac Mini and started reading up about Wake on LAN and of course, as a nerd, I wanted to build my own tool. Moving a large chunk of that workload to a different machine on my local network hugely extends the time I can spend working outside without having to run extension cords everywhere. I do a lot of frontend development and with all the build tooling that comes along with it, I find my laptop only allows for around 1.5 hours of heavy frontend development when on battery. Using VS-Code Remote has allowed me to remain very productive whilst experimenting with the new platform. I recently invested in a Mac Mini M1 as a secondary machine and have been enjoying using it with VS-Code Remote.Īs a developer, the Apple Silicon experience isn't quite ready for full time use while minor incompatibilities are still getting ironed out. Categories Tags Resume Wake on LAN in Rust DecemRead time: 5 minute(s) 841 words
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