This script will restart network adapter

restart-netadapter.ps1

<#	
	.NOTES
	===========================================================================
	 Created with: 	SAPIEN Technologies, Inc., PowerShell Studio 2016 v5.2.117
	 Created on:   	17.03.2016
	 Created by:   	Dmitriy Kagarlickij
	 Contact: 	    dmitriy@kagarlickij.com
	===========================================================================
	.DESCRIPTION
		This script should be executing with Administrator-level permissions
#>

#Requires -RunAsAdministrator

# Set variables
$AdapterName = "Ethernet"
$LogFile = "C:\Users\Administrator\RestartNetAdapter$AdapterName.log"

# Check net adapter current status
if ( $((Get-NetAdapter -Name $AdapterName)."Status") -ne 'Up' )
{
	Write-Output "Net adapter is disabled or absent. Script will be stopped."
	exit
}

# Remove old log file if it's present
if (Test-Path $LogFile)
{
	Remove-Item $LogFile	
}

# Create new log file
Write-Output "Script has been started at $(Get-Date -Format g)" | Out-File $LogFile

# Get current IPAddr
$firstIP = $((Get-NetIPAddress -InterfaceAlias $AdapterName -AddressFamily "IPv4").IPAddress)
Write-Output "IPAddr before adapter restart = $firstIP" | Out-File $LogFile -Append

# Quick net adapter restart
Write-Output "Quick net adapter restart has been initiated" | Out-File $LogFile -Append
Restart-NetAdapter -Name $AdapterName -Confirm:$false
Start-Sleep -Seconds 5

# Check net adapter current status and start slow restart in case of necessarity
if ($((Get-NetAdapter -Name $AdapterName)."Status") -ne 'Up')
{
	Write-Output "Slow net adapter restart has been initiated" | Out-File $LogFile -Append
    Disable-NetAdapter -Name $AdapterName -Confirm:$false
	Start-Sleep -Seconds 30
	Enable-NetAdapter -Name $AdapterName -Confirm:$false
}

# Final check net adapter current status
if ($((Get-NetAdapter -Name $AdapterName)."Status") -ne 'Up')
{
	Write-Output "Net adapter has been restarted with error" | Out-File $LogFile -Append
}
else
{
	Write-Output "Net adapter has been restarted successfully" | Out-File $LogFile -Append
}

# Get current IPAddr
$secondIP = $((Get-NetIPAddress -InterfaceAlias $AdapterName -AddressFamily "IPv4").IPAddress)
Write-Output "IPAddr after adapter restart = $secondIP" | Out-File $LogFile -Append

# Compare IPAddr
if ($secondIP -eq $firstIP)
{
	Write-Output "After net adapter restart IPAddr was not chahged" | Out-File $LogFile -Append
}
else
{
	Write-Output "After net adapter restart IPAddr was chahged" | Out-File $LogFile -Append
}

# Variables cleanup
Remove-Variable -Name * -ErrorAction SilentlyContinue