TCP window calculator

tcpwindow.cpp

// tcpwindow.cpp : Defines the entry point for the console application.
// Fixed from https://blogs.technet.microsoft.com/neilcar/2004/10/26/quick-figuring-optimal-tcp-window-size/#comment-263
//
//#include "stdafx.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(int argc, char* argv[])
{
	float pingRTT;
	float bandwidth;
	const char* pingExample = "c:\\>ping slow-msg-51\n\n\tReply from 17.54.12.19: bytes=32 time=176ms TTL=56\n\tReply from 17.54.12.19: bytes=32 time=114ms TTL=56\n\tReply from 17.54.12.19: bytes=32 time=117ms TTL=56\n\tReply from 17.54.12.19: bytes=32 time=171ms TTL=56\n";
	const char* pingExample2 = "\n\tPing statistics for 17.54.12.19:\n\t Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),\n\tApproximate round trip times in milli-seconds:nt Minimum = 114ms, Maximum = 176ms, Average = 144ms\n\n";
	printf("===================================\n");
	printf(" The TCPWindow Size Tool\n");
	printf("===================================\n");
	printf("\n\n");

	printf("STEP 1: Find the RTT:\n");
	printf("======================\n");
	printf("Example: \n");
	printf("t");
	printf("%s",pingExample);
	printf("%s",pingExample2);
	printf("Note —> Approximate round trip times in milli-seconds:\n\t … Average = 144ms\n\n");
	printf("\n\n");

	printf("========================================================\n");
	printf("What is the Approximate round trip times for your issue?\n");
	printf("========================================================\n");
	printf(" Action: Type in the seconds value (if rtt was 144 then enter \".144\")\n and press ENTER\n\n");
	printf("RTT Value: ");
	scanf("%f",&pingRTT);
	printf("\n\n");

	printf("STEP 2: State the bandwidth:\n");
	printf("==============================\n");
	printf("Example: \n\n");
	printf("\t");
	printf("This is the WAN bandwidth. An example could be 1.44, 5, 10, 45, etc…\n");
	printf("\n\n");

	printf("=====================================================\n");
	printf("What is the the available bandwidth of your WAN link?\n");
	printf("=====================================================\n");
	printf(" Action: Type in the value (i.e. 1.5) and press ENTER\n\n");
	printf("Value: ");
	scanf("%f",&bandwidth);
	printf("\n\n");

	printf("You have specified: %f as the RTT.\n",pingRTT);
	printf("You have specified: %f for the bandwidth.\n",bandwidth);
	printf("\n\n");

	printf("STEP 3: Do the numbers:\n");
	printf("==============================\n");
	printf("Step1: ([BANDWIDTH]*1024*1024/8)bytes/second * [ROUND TRIP] = [TCP WINDOW]\n\n");
	printf("Step2: (%f*1024*1024/8)bytes/second * (%f) = [TCP WINDOW]\n\n",pingRTT,bandwidth);

	int step3;
	step3 = (pingRTT * 1024*1024/8);
	printf("Step3: (%d) * (%f) = [TCP WINDOW]\n\n",step3,bandwidth);

	float step4;
	step4 = step3 * bandwidth;

	printf("Step4: %f = [TCP WINDOW]\n\n",step4);
	printf("Step4: TCPWindowSize = %d\n\n",int(step4));
	return 0;
}