419 lines
11 KiB
HTML
419 lines
11 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 4.0//EN">
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<html>
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<head>
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<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=utf-8">
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<title>TCP/IP troubleshooter</title>
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<meta name="Copyright" content="Copyright (c) 2004 by IBM Corporation">
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<script language="Javascript" type="text/javascript" src="../../iccommon.js"></script>
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<script type="text/javascript" language="Javascript">
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var badIPError = "IP addresses and subnet masks must be four decimal numbers between 0 and 255 separated by a period. For example, 10.1.2.3.";
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var badFirstSegmentError = "The first segment of an IP address cannot be 0.";
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var blankMsg = "You must fill this field in.";
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var text1 = " Your local address is the same as the subnet address for your subnet. This may make your local address unroutable in your network.";
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var text2 = " Your local address is the same as the broadcast address for your subnet. This may make your local address unroutable in your network.";
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var text3 = "Your local and remote addresses are within the same subnet.";
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//START NON-TRANSLATABLE
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//NS4 = (document.layers) ? 1 : 0;
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//IE4 = (document.all) ? 1 : 0;
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//ver4 = (NS4 || IE4) ? 1 : 0;
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var theSeg;
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var maskArray;
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var inAddyArray;
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var pingAddyArray;
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var highAddy;
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var lowAddy;
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var output;
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var answer = false;
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var ran = false;
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function isValidSubnetMask (address) {
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var addrPart = address.split(".");
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var testParts = new Array("254","252","248","240","224","192","128","0");
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var validated=0;
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if (addrPart[0]=="255"){
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if (addrPart[1]=="255") {
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if (addrPart[2]=="255") {
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for (x=0;x<testParts.length;x++) {
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if (addrPart[3]==testParts[x]) {validated=1;}
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}
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}//end if addrpart2=255
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else {//else addrpart 2<255
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if (addrPart[3]=="0") {
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for (x=0;x<testParts.length;x++) {
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if (addrPart[2]==testParts[x]) {validated=1;}
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}
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}
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}//end else addrpart2
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}//end if addrpart1==255
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else {//else addrpart1<255
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if ((addrPart[2]=="0")&&(addrPart[3]=="0")) {
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for (x=0;x<testParts.length;x++) {
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if (addrPart[1]==testParts[x]) {validated=1;}
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}
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}
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}//end else addrpart1
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}//end addrpart0==255
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else {//else addrpart0<255
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if ((addrPart[1]=="0")&&(addrPart[2]=="0")&&(addrPart[3]=="0")) {
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for (x=0;x<testParts.length-1;x++) {
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if (addrPart[0]==testParts[x]) {validated=1;}
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}
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}
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}//end else addrpart0
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if (validated == 1){ return true;}
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else {return false;}
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}
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function isValidIPAddress (address){
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var segment = address.split(".");
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if (segment[0] == 0) { alert(badFirstSegmentError); return false;}
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for (x=0; x<segment.length; x++){
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checknum = segment[x];
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if ((checknum < 0) ||(checknum > 255) || (isNaN(checknum))) {
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alert(badIPError);
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return false;
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}
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}
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address = segment.join(".");
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var valAddr = /^((([0-9-]){1,3})[\.]){3}(([0-9-]){1,3})$/;
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return valAddr.test(address);
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}
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/* This function checks to see if the local IP address happens to match
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the calculated subnet and broadcast addresses. If there is a match,
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an additional message is attached to the user output. It takes three
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arguements: the local IP address, and the start and end IP addresses.
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*/
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function checkIP(local, start, end){
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if (local.join(".") == start.join(".")){
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output = output + text1;
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}
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if (local.join(".") == end.join(".")){
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output = output + text2;
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}
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}
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/* This function takes a form object as an arguement. It checks to see
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if the form's text fields are empty. If it finds an empty field, it
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returns false; else it returns true.
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*/
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function checkBlanks(formObj){
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if (formObj.elements[0].value == ""){
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alert(blankMsg);
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formObj.elements[0].focus();
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return false;
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}
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else if (formObj.elements[1].value == ""){
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alert(blankMsg);
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formObj.elements[1].focus();
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return false;
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}
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else if (formObj.elements[2].value == ""){
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alert(blankMsg);
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formObj.elements[2].focus();
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return false;
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}
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else { return true;}
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}
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/* This function take a form object as an arguement. It gets the IP addresses and does
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IP calculations. Then it outputs an answer as to whether a local and remote IP address
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are on the same subnet.
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*/
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function checkSubnet(){
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formObj = eval("document.subnetform");
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// Getting the form values into variables
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inAddy = formObj.localip.value;
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pingAddy = formObj.remoteip.value;
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inMask = formObj.mask.value;
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writeIt("", 'results');
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if (checkBlanks(formObj)){ //check for blank fields
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if (isValidIPAddress(inAddy) && isValidIPAddress(pingAddy) && isValidSubnetMask(inMask)){ //check validity of input
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// Changing the IP addresses into arrays
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maskArray = inMask.split(".");
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inAddyArray = inAddy.split(".");
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pingAddyArray = pingAddy.split(".");
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highAddy = inAddy.split(".");
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lowAddy = inAddy.split(".");
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if ((maskArray.length == 4) && (inAddyArray.length == 4) && (pingAddyArray.length == 4)) {
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ran = true;
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rangeFactor = findFactor(maskArray);
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myMod = inAddyArray[theSeg] % rangeFactor;
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ipRangeStart = inAddyArray[theSeg] - myMod;
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if (ipRangeStart < 0 ){ ipRangeStart = 0;}
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lowAddy[theSeg] = ipRangeStart;
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ipRangeEnd = ipRangeStart + rangeFactor;
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highAddy[theSeg] = ipRangeEnd;
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adjustEndRange();
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//Outputting to the division;
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if (isBetween(pingAddyArray, highAddy, lowAddy, theSeg)){ // the address is in the range
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output = text3;
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checkIP(inAddyArray, lowAddy, highAddy);
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answer = true;
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} else { //the address is not between;
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//END NON-TRANSLATABLE
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output = "Your local and remote addresses are not within the same subnet. The range of IP addresses for the local address is " + lowAddy.join(".") + " through " + highAddy.join(".") + ".";
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//START NON-TRANSLATABLE
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}
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//output = output + "<form><input type='button' value='Close' onClick='closeThis()'><\/form>";
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writeIt(output, 'results');
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}
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else { alert(badIPError);}
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}
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else {alert(badIPError);}
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}
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}
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function closeThis() {
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if ( ran ) {
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if (answer) {
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opener.form1.rad[0].checked = true;
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}
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else {
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opener.form1.rad[1].checked = true;
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}
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}
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window.close();
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}
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/* This function adjusts the high and low IP addresses after the ranges have been
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calculated.
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*/
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function adjustEndRange(){
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switch ( theSeg) {
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case 3 :
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highAddy[3]--;
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break;
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case 2 :
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lowAddy[3] = 0;
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highAddy[2]--;
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highAddy[3] = 255;
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break;
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case 1:
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highAddy[3]=255;
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highAddy[2]=255;
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highAddy[1]--;
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lowAddy[2]=0;
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lowAddy[3]=0;
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}
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}
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/* This function takes four arguements. The remote (ping) address, the high and low IP ranges,
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and the segment number. It returns true or false if the remote IP address is between (or not)
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the high and low IP address range
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*/
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function isBetween(ping, high, low, seg){
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for (i=0; i <= seg-1; i++){
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if ( parseInt(ping[i]) != parseInt(high[i])){ //checking to make sure segments match
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return false;
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}
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} //end-for
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var between = ((parseInt(ping[seg]) >= parseInt(low[seg])) && (parseInt(ping[seg]) <= parseInt(high[seg]))) ? true : false;
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return between;
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}
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/* This function takes the subnet mask as an array as an arguement. Based on the mask, it
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determines which segment of the mask determines the IP range. It sets that segment as a
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global value called theSeg and returns the factor.
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*/
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function findFactor(tmpA){
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var binNum;
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for (i=3; i >= 0; i--){
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binNum = "";
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binRep = dec2bin(tmpA[i]);
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// document.write("<P>" + tmpA[i] + "---" + binRep + "</p>");
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for (j=binRep.length-1; j >= 0; j--){
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if (binRep.charAt(j) == 1) {
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binNum = "1" + binNum;
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binNum=parseInt(binNum);
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theSeg = i;
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return bin2dec(binNum);
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}
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else {
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binNum = binNum + "0";
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}
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}
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}
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}
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/* This function converts a binary number to a decimal number and then returns
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the decimal number.
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*/
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function bin2dec(binNum){
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return parseInt(binNum, 2);
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}
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/* This function converts a decimal number to binary number and
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returns the binary number.
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*/
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function dec2bin(decNum){
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currnum = 128;
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var binNum;
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if(decNum >= currnum) {
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binNum = "1";
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decNum = decNum - currnum;
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currnum = currnum / 2;
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}
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else {
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binNum = "0";
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currnum = currnum / 2;
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}
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for (p = 1; p <= 7; p++) {
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if(decNum >= currnum){
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binNum = binNum + "1";
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decNum = decNum - currnum;
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currnum = currnum / 2;
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}
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else {
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binNum = binNum + "0";
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currnum = currnum / 2;
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}
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}
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return binNum;
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}
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function writeIt(text,id) {
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if (document.getElementById){
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x = document.getElementById(id);
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x.innerHTML = text;
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}
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else if (document.all){
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x = document.all[id];
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x.innerHTML = text;
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}
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else if (document.layers) {
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x = document.layers[id];
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text2 = '<P CLASS="testclass">' + text + '<\/P>';
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x.document.open();
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x.document.write(text2);
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x.document.close();
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}
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}
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function subnetCalc(showResults,on)
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{
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if (isNS && !isNS6) {
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document.layers[showResults].visibility = "show";
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} else {
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document.all[showResults].style.visibility = "visible";
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}
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}
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//Pass true if IP is on same subnet as remote interface, false otherwise
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function closeWindowAndWriteToTroubleshooter(isIPOnSameSubnet) {
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if (isIPOnSameSubnet == true) {
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//Set value on troubleshooter page to Yes
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window.opener.document.form1.rad[0].checked = true;
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} else {
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//Set value on troubleshooter page to N0
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window.opener.document.form1.rad[1].checked = true;
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}
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window.close();
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}
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//END NON-TRANSLATABLE
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</script>
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</head>
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<body onUnload="closeThis()">
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<script type="text/javascript" language="Javascript"></script>
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<form name="subnetform">
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<h2>Calculate subnet</h2>
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<p>Complete the following fields, click Calculate, and view the results.</p>
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<TABLE width="80%">
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<TR>
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<td width="60%" nowrap>
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<LABEL for="LocalIP">Specify the IP address associated with your local interface:</LABEL>
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</td>
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<TD align="left">
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<INPUT type="number" name="localip" size="15" id="LocalIP" value="">
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</TD>
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</TR>
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<TR>
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<TD width="60%" nowrap>
|
||
|
|
<LABEL for="LocalMask">Specify the subnet mask you are using for the local IP address:</LABEL>
|
||
|
|
</TD>
|
||
|
|
<TD align="left">
|
||
|
|
<INPUT type="number" name="mask" size="15" id="LocalMask" value="">
|
||
|
|
</TD>
|
||
|
|
</TR>
|
||
|
|
<TR>
|
||
|
|
<TD width="60%" nowrap>
|
||
|
|
<LABEL for="RemoteIP">Specify the IP address associated with the remote interface:</LABEL>
|
||
|
|
</TD>
|
||
|
|
<TD align="left">
|
||
|
|
<INPUT type="number" name="remoteip" size="15" id="RemoteIP" value="">
|
||
|
|
</TD>
|
||
|
|
</TR>
|
||
|
|
<tr></tr>
|
||
|
|
</TABLE>
|
||
|
|
</form>
|
||
|
|
|
||
|
|
<table>
|
||
|
|
<tr>
|
||
|
|
<td width="50%">
|
||
|
|
<div id="results" style="position:relative; background:lightgrey; border:double; border-width:1px; padding:10px; width: 450px;" name="results">
|
||
|
|
<P> </p><P> </p><P> </p><P> </p>
|
||
|
|
</div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
<form><p><center>
|
||
|
|
<INPUT type="button" name="calculate" value="Calculate" onclick= "checkSubnet();"> <INPUT type="button" name="closeButton" value="Close window" onclick= "closeThis()">
|
||
|
|
</center></p></form>
|
||
|
|
</body>
|
||
|
|
</html>
|