Restart Network Adapter

# Check that the network is rechable on Linux KVM machines. If not,
# disable the NIC, wait 30 seconds, and enable the NIC again.
# If the computer is online, send a notification email.
# Created by Andrew Zbikowski. <andyzib@gmail.com>
# Version: 2013-07-08_01

# Network adapter service name. Use get-WmiObject win32_networkadapter | fl to find this.
# netkvm for RHEL KVM
$serviceName = "netkvm"
# E1G60 for VMware Fusion
#$serviceName = "E1G60"

# Ping this computer/IP address to test connectivity.
$pingHost = "10.1.1.1"

# Ping Count, number of times to ping $pingHost
$pingCount = 4

#SMTP server name
$smtpServer = "smtp.domain.com"

# Email From
$emailFrom = "Robot B-9 <noreply@example.com>"

# Email To
$emailTo = "alerts@example.com"

function sendMail{
    $computer = gc env:computername

    #Creating a Mail object
    $msg = new-object Net.Mail.MailMessage

    #Creating SMTP server object
    $smtp = new-object Net.Mail.SmtpClient($smtpServer)

    #Email structure
    $msg.From = $emailFrom
    $msg.ReplyTo = $emailFrom
    $msg.To.Add($emailTo)
    $msg.subject = "Network Connection Restarted on $computer"
    $msg.body = "Network connectivity was lost on $computer. NIC on $computer was restarted and connectivity has been restored."

    #Sending email
    $smtp.Send($msg)
}


If (-Not(Test-Connection $pingHost -count 4 -quiet)) {
    $Ethernet = get-WmiObject win32_networkadapter |where { $_.ServiceName -like "*$serviceName*"}
    $Ethernet.Disable()
    Start-Sleep -s 30
    $Ethernet.Enable()
    Start-Sleep -s 30
    If (Test-Connection $pingHost -count 4 -quiet) {
        sendMail
    }
}