Windows VPN ReDial if ping to VPN's Gateway is fault.

VPNCheckerAndReRasdial.cs

using System;
using System.Diagnostics;
using System.IO;
using System.Net.NetworkInformation;
using System.Threading;
using System.Threading.Tasks;

namespace VPNCheckerAndReRasdial
{
    internal class Program
    {
        static readonly string ipAddress = File.ReadAllText(@"cfg_ip_gateway.txt"); // "192.168.1.1"; // VPN Gateway

        static async Task Main()
        {
            Trace.AutoFlush = true;
            Trace.Listeners.Clear();
            Trace.Listeners.Add(new ConsoleTraceListener());
            Trace.Listeners.Add(new TextWriterTraceListener(System.IO.Path.GetFileNameWithoutExtension(typeof(Program).Assembly.GetName().Name) + ".log"));
            Trace.WriteLine("[" + DateTime.Now.ToString() + "] " + "Started");

            Ping pingSender = new Ping();

            while (true)
            {
                //Wait for some time before ping again
                Thread.Sleep(5000);
                try
                {
                    var reply = await pingSender.SendPingAsync(ipAddress);
                    for (int i = 0; i < 5; i++)
                    {
                        Console.WriteLine("[" + DateTime.Now.ToString() + "] " + $"{reply.Buffer.Length} bytes from {reply.Address}:" + $" icmp_seq={i} status={reply.Status} time={reply.RoundtripTime}ms");
                    }
                    if (reply.Status == 0)
                    {
                        Console.WriteLine("[" + DateTime.Now.ToString() + "] " + "Ping successful. VPN still working...");
                    }
                    else
                    {
                        Trace.WriteLine("[" + DateTime.Now.ToString() + "] " + "Ping unsuccessful. Reconnecting VPN...");
                        ProcessStartInfo rasdial = new ProcessStartInfo
                        {
                            FileName = "rasdial",
                            Arguments = File.ReadAllText(@"cfg_line.txt") // "VPN_Interface_Name Login Password"; // ChangeMe
                        };
                        Process.Start(rasdial);
                    }
                }
                catch (PingException e)
                {
                    Trace.WriteLine("[" + DateTime.Now.ToString() + "] " + e.Message);
                }
            }
        }
    }
}