A PDQ Inventory Tool that creates a firewall rule to block ICMPv4 to the target you specify.

Trigger Heartbeat Schedules.xml

<?xml version="1.0" encoding="utf-8"?>
<AdminArsenal.Export Code="PDQInventory" Name="PDQ Inventory" Version="18.3.32.0" MinimumVersion="15.0">
  <CustomTool>
    <CredentialsId value="null" />
    <RunAs>Admin</RunAs>
    <ScanAfter>DoNotScan</ScanAfter>
    <ScanProfileId value="null" />
    <SuccessCodesText>0</SuccessCodesText>
    <Timeout>00:00:30</Timeout>
    <WakeOnLan value="false" />
    <CustomToolType>Local</CustomToolType>
    <CommandLine>"Creating a firewall rule to block ICMPv4 to $(Computer:TARGET) - $(Computer:TARGETIPADDRESS)"
""
$null = netsh advfirewall firewall add rule name="Block $(Computer:TARGET)" dir=out action=block profile=any remoteip=$(Computer:TARGETIPADDRESS) protocol=icmpv4

"Run a manual Heartbeat (CTRL+H) against $(Computer:TARGET). It should now show as Offline."
""
Read-Host "Press ENTER in this window once $(Computer:TARGET) is Offline, wait a few seconds, then run another Heartbeat"

$null = netsh advfirewall firewall delete rule name="Block $(Computer:TARGET)"</CommandLine>
    <DefaultIconKey></DefaultIconKey>
    <LibraryToolId value="null" />
    <Modified value="null" />
    <ShellOpenMode>CloseShell</ShellOpenMode>
    <Mode>PowerShell</Mode>
    <Description></Description>
    <IconKey>Icon-PowerShell</IconKey>
    <KeyGesture></KeyGesture>
    <Title>Trigger Heartbeat Schedules</Title>
    <TypeName>CustomTool</TypeName>
  </CustomTool>
</AdminArsenal.Export>