Assignment : 3

SPPU CN-Practicals (TE-Comp)

Write a program in Java/Python to demonstrate sub netting and find the sub net masks.

We will require to classes 
1 . subnet
2 . subnetmask

Following are the JAVA codes for above two classes

1 . subnet class

import java.util.Scanner; import java.net.InetAddress; class subnet {
public static void main(String args[]) { Scanner sc= new Scanner(System.in); System.out.print("Enter the ip address="); String ip=sc.nextLine(); //----Split the Ip Address------- String split_ip[] = ip.split("\\."); //----- Converting the Ip Address to binary---- String split_bip[]= new String[4]; String bip = ""; for(int i=0;i<4;i++) { split_bip[i]=appendZeroes(Integer.toBinaryString(Integer.parseInt(split_ip[i]))); bip+=split_bip[i]; } System.out.println("The binary IpAddress is="+bip); //----- Finding the Subent mask----- System.out.println("Enter the number of address"); int n=sc.nextInt(); int bits=(int)Math.ceil(Math.log(n)/Math.log(2)); System.out.println("The number of bits required="+bits); int mask=32-bits; int total_address=(int)Math.pow(2,bits); System.out.println("Subnet mask is "+mask); //---- Finding the first and last address---- //---- First address Calculation-------- int fbip[]=new int[32]; for(int i=0;i<32;i++) { //Convert to the character 1,0 to integer 1,0 fbip[i]=(int)bip.charAt(i)-48; } for(int i=31;i>31-bits;i--) { //Get first address by anding the last bits with 0 fbip[i] &=0; } String fip[]={"","","",""}; for(int i=0;i<32;i++) { fip[i/8]=new String(fip[i/8]+fbip[i]); } int first_offset=0; int ipAddr[]=new int[4]; ; System.out.println("Group 1 \nThe First Address is:"); for(int i=0;i<4;i++) { System.out.print(ipAddr[i]=first_offset=Integer.parseInt(fip[i],2)); if(i!=3) System.out.print("."); } System.out.println(); //--- Last address Calculation---- int lbip[]=new int [32]; for(int i=0;i<32;i++) { // Convert the character 1,0 to integer 1,0 lbip[i]=(int)bip.charAt(i)-48; } for(int i=31;i>31-bits;i--) { // Get last address by oring with last bits with 1 lbip[i]|= 1; } String lip[]={"","","",""}; for(int i=0;i<32;i++) { lip[i/8]=new String(lip[i/8]+lbip[i]); } int ipLast[]=new int[4]; System.out.println("The Last Address is:"); for(int i=0;i<4;i++) { System.out.print(ipLast[i]=Integer.parseInt(lip[i],2)); if(i!=3) System.out.print("."); } System.out.println(); System.out.println("How many subnets do you want to form?"); int scount=sc.nextInt(); for(int j=1;j<scount;j++) { System.out.println(" GROUP "+ (j+1)+" FIRST ADDRESS:"); for(int i=0;i<4;i++) { if(i<3) { System.out.print(ipAddr[i]+"."); } else System.out.println(ipAddr[i]=ipAddr[i]+total_address); } System.out.println(" GROUP "+ (j+1)+" LAST ADDRESS:"); for(int i=0;i<4;i++) { if(i<3) { System.out.print(ipLast[i]+"."); } else System.out.println(ipLast[i]=ipLast[i]+total_address); } System.out.println(); } try { System.out.println("Enter the Ip address to ping="); Scanner s=new Scanner(System.in); String ip_add=s.nextLine(); InetAddress inet = InetAddress.getByName(ip_add); if(inet.isReachable(5000)) { System.out.println("The ip address is reachable"+ip_add); } else { System.out.println("The ip address is not reachable"+ip_add); } } catch( Exception e) { System.out.println("Exception:"+e.getMessage()); } } static String appendZeroes(String s) { String temp= new String("00000000"); return temp.substring(s.length())+ s; } }




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2 . subnetmask


import java.util.Scanner; public class subnetmask { public static void main(String[] args) { Scanner scan = new Scanner(System.in); String ip = new String(); int mask=0,defaultmask=0; System.out.println("enter ip address"); ip = scan.nextLine(); System.out.println("enter mask"); mask = scan.nextInt(); String[] splitip = ip.split("\\."); System.out.println(splitip[0]+" "+splitip[1]+" "+splitip[2]+" "+splitip[3]+" "); int first = Integer.parseInt(splitip[0]); if(first>=0&&first<=127){ System.out.println("CLASS A"); defaultmask = 8; } else if(first>127&&first<=191){ System.out.println("CLASS B"); defaultmask=16; } else if(first>191&&first<=223){ System.out.println("CLASS C"); defaultmask=24; } else if(first>223){ System.out.println("CLASS D"); defaultmask=32; } String binip = new String(); String defmask = new String(); for(int i=0;i<4;i++){ binip = binip + appendZeroes(Integer.toBinaryString(Integer.parseInt(splitip[i]))); } System.out.println("IP in binary : "+binip); System.out.println("Default Mask : "+defaultmask); for(int i=0;i<32;i++){ if(i<mask){ defmask = defmask + "1"; } else{ defmask = defmask + "0"; } } System.out.println(defmask); String netid = new String(); for(int i=0;i<32;i++){ netid = netid + (Integer.parseInt(""+binip.charAt(i))&Integer.parseInt(""+defmask.charAt(i))); } int p=-1; System.out.println(netid); String[] net = new String[4]; String[] def = new String[4]; for(int i=0;i<32;i++){ if(i%8==0){ p++; net[p] = ""; def[p]=""; net[p] = net[p] + netid.charAt(i); def[p] = def[p] + defmask.charAt(i); } else{ net[p] = net[p] + netid.charAt(i); def[p] = def[p] + defmask.charAt(i); } } System.out.println("Given IP : "+ip); System.out.print("subnet mask :"); for(int i=0;i<4;i++){ System.out.print(Integer.parseInt(def[i],2)); if(i!=3) System.out.print("."); } System.out.println(); System.out.print("NetId : "); for(int i=0;i<4;i++){ System.out.print(Integer.parseInt(net[i],2)); if(i!=3) System.out.print("."); } } private static String appendZeroes(String binaryString) { // TODO Auto-generated method stub /*if(binaryString.length()<8){ for(int i=0;i<8-binaryString.length();i++){ binaryString = "0" + binaryString; } }*/ String temp = new String("00000000"); return temp.substring(binaryString.length())+ binaryString; } }