$XMLfile = “C:\Users\Administrator\OneDrive\PowerShellScript\WakeOnLan\Computers.xml” Import-Module C:\Users\Administrator\OneDrive\PowerShellScript\WakeOnLan\WakeOnLan.psm1 -Force -Verbose Get-ComputerDataFile Using this Load them up and lets get started! Now, lets see what’s in the data file by using this function New-ComputerDataFile Get information from the XML data file So while the machines are “live” I can get the MAC, IP and Computer name and store that in an XML File, then I can later use that information to wake my machines up when I need them, so I do need to store that information somehow. Well getting the macaddress is easy when the machine is turned on, but, hey that’s not going to be the case here. Storing the MacAddress in a XML data file There are of course a bunch of other ways to get the MAC address, you can of course grab the MAC address from with in the OS using basically any command line, but it’s so handy to not logon to all the machines(Yes I know there are ways, but I have a massive amount of lab machines, not members of the domain and other strange machines). So the second function is to get the IP from name.Īnd combining them leads me into the last function. The first function is to grab the MAC from a “live” IP address, but then I need to know the IP. So by using the fundamentals from Kris Powell I crerated a function of this:īut to be able to send a Magic Packet I do need a MacAddress, so I need a function for that to and here it is. So browsing around the Internet lead me to this site where the basic functionality to create a magic packet exist. I don’t like to download utilities or application when I don’t really need to, if i can solve this with a simple PowerShell CMD-let or a simple function, I’ll use that instead. How does this work? The Wake On LAN Function The first section in this post is about how it works, and the second part is how to use it. My hands needs to be close to my keyboard, BTW, Wake on LAN is not something new, it is actually pretty old. So when working with computers, datacenters, at home or basically anywhere I don’t like to get up and push a button. RT CANIntl: UAE to launch Cop28 presidency with oil boss tipped for leading role via fionaharvey "HSBC loans $360m to coal project despite pledge to halt fossil fuel funding." RT henrywismayer: I keep returning to these graphs by jburnmurdoch at the FT and wondering why more British journalism can't be as strai… 3 months ago ContainsKey( $MacString)) Ģ5.# Packet is byte array first six bytes are 0xFF, followed by 16 copies of the MAC addressĢ7.Write-Verbose “Broadcast packet: $(::ToString($Packet))”Ģ9.$UdpClient=New-Object ģ0.$UdpClient.Connect((::Broadcast),4000)ģ1.$UdpClient.Send($Packet,$Packet.Length)ģ3.Write-Verbose “Wake-on-Lan Packet sent to $MacString” Param ( $MacString =$( Throw 'Mac address is required')).# Send Wake-on-Lan Magic Packet to specified Mac address.It would be possible to use DNS and the ARP Cache to resolve MAC addresses but the ARP cache will only be populated with a valid entry for any given target adapter for a relative short period of time after the last use of the address (10 minutes or less depending on usage) ARP cannot be used to dynamically resolve the address of a suspended adapter. This script has a table of saved MAC addresses to allow aliases to be specified on the command line (the real addresses have been obfuscated here) and uses a regex to validate the resulting MAC address string. Construction of this packet in PowerShell is a breeze thanks to the array semantics in the language (“$Packet = ](,0xFF*6) ($Mac*16)” – neat). This packet is sent via UDP to the LAN Broadcast address (255.255.255.255) on arbitrary Port 4000 – although the layer 3 baggage is actually largely irrelevant. Wake on Lan uses a “Magic Packet” that consists of six bytes of 0xFF (the physical layer broadcast address), followed by 16 copies of the 6-byte (48-bit) MAC address (see ). I use this a lot – especially these days with spiralling electricity costs – to wake suspended machines and servers. Here’s my take on the theme in PowerShell (naturally:-) There are a bunch of these to be found on the Web (see the additional notes on Origins below) although sadly some of them are either incorrect or of very dubious style.
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