(PowerShell) Check Internet Connectivity

Demonstrates an efficient way to test for Internet connectivity.

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

$socket = New-Object Chilkat.Socket
# 1. Use a reliable Anycast IP. 
#    8.8.8.8 (Google) or 1.1.1.1 (Cloudflare) are the industry standards.
$targetIp = "8.8.8.8"

# 2. Use Port 53 (DNS). 
#    DNS servers typically listen on TCP Port 53 as well as UDP. 
#    (Alternatively, use port 443 if you suspect port 53 is blocked).
$port = 53

# 3. Disable SSL (0). 
#    We are not doing a handshake, just a TCP connection.
$ssl = $false

# 4. Short Timeout (1500ms).
#    If you can't reach Google in 1.5 seconds, the connection is 
#    likely too poor for practical use anyway.
$timeoutMs = 1500

# Connect
$success = $socket.Connect($targetIp,$port,$ssl,$timeoutMs)
if ($success -eq $false) {
    $($socket.LastErrorText)
    exit
}

$socket.Close(10)

$("We have Internet connectivity.")