Help with a simple configuration to connect a pc and router

Since I want to access to my openwrt router at my network's home I discovered I am forced to use OpenVPN. In fact the ISP which provides the internet connection doesn't allow his customers to be visible from the exterior (it is an Italian ISP named Fastweb).
The pc with what I want to access my router from the exterior is connected to the internet with a public IP and I can open the doors I want. For this reason I want to install the openvpn server on that pc.
What I would like to achieve is to see all the devices connected on the openwrt router (and the router itself) from the PC with the public IP.
For example, access the router web interface by simply writing 192.168.1.1 on the pc with openvpn server of which the local address is 10.0.0.2.
At the same time I would avoid to install the openvpn client on each device connected to the openwrt router. Is this possible? So reach the 192.168.1.3 pc from my openvpn server pc with 10.0.0.2 as local address, without installing openvpn client on the 192.168.1.3 pc.
Is this kind of operation called "bridging"? I am pretty new with openvpn, so I came here to gently ask if you can suggest me some configurations for the openvpn server and client.
What would happen if I restart the pc with the openvpn server? I mean does the router with openvpn client automatically reconnect as soon the openvpn server is again on?
I think an image is better descriptive of what I want to build:
Really thanks in advance.
Last edited by Garret (2011-12-14 00:53:28)

EDIT: AFAIK, the concept of "Server" and "Client" in OpenVPN only refers to which machine initiates the connection. It doesn't affect the resulting connection. That is entirely dependent on the configuration.
Garret wrote:At the same time I would avoid to install the openvpn client on each device connected to the openwrt router. Is this possible? So reach the 192.168.1.3 pc from my openvpn server pc with 10.0.0.2 as local address, without installing openvpn client on the 192.168.1.3 pc.
You only need the Client on one machine.
Garret wrote:Is this kind of operation called "bridging"? I am pretty new with openvpn, so I came here to gently ask if you can suggest me some configurations for the openvpn server and client.
If you setup a bridged VPN, the "OpenVPN Server" machine will get a second address within the 192.168.1.x network (for example, 192.168.1.20). It will use this address (via the VPN) to connect to the other hosts inside your network.
If you setup a routed VPN, then both address ranges (192.168.1.x and 10.0.0.x) will "become visible" at both ends.
If you only want the "OpenVPN Server" to be able to access your "home", then I would recommend a Bridged VPN.
Garret wrote:What would happen if I restart the pc with the openvpn server? I mean does the router with openvpn client automatically reconnect as soon the openvpn server is again on?
Yes.
Last edited by fukawi2 (2011-12-13 22:38:58)

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Topic: Need help with if, else, and which statements and loops.
How would I display 60 < temp. <= 85 in java
System.out.println("60 < temp. <= 85 in java");
another question is how do I ask a question like want to try again (y/n) after a output and asking that everytime I type in yes after a output and terminate when saying No.Sun's [basic Java tutorial|http://java.sun.com/docs/books/tutorial/]
Sun's [New To Java Center|http://java.sun.com/learning/new2java/index.html].Includes an overview of what Java is, instructions for setting up Java, an intro to programming (that includes links to the above tutorial or to parts of it), quizzes, a list of resources, and info on certification and courses.
[http://javaalmanac.com|http://javaalmanac.com]. A couple dozen code examples that supplement [The Java Developers Almanac|http://www.amazon.com/exec/obidos/tg/detail/-/0201752808?v=glance].
jGuru. A general Java resource site. Includes FAQs, forums, courses, more.
JavaRanch. To quote the tagline on their homepage: "a friendly place for Java greenhorns." FAQs, forums (moderated, I believe), sample code, all kinds of goodies for newbies. From what I've heard, they live up to the "friendly" claim.
Bruce Eckel's [Thinking in Java|http://mindview.net/Books/DownloadSites] (Available online.)
Joshua Bloch's [Effective Java|http://www.amazon.com/Effective-Java-2nd-Joshua-Bloch/dp/0321356683/ref=pd_bbs_1?ie=UTF8&s=books&qid=1214349768&sr=8-1]
Bert Bates and Kathy Sierra's [Head First Java|http://www.amazon.com/exec/obidos/tg/detail/-/0596004656?v=glance].
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There are 2 classes (code below) - Call class - this contains all the code need to create the ball and BallWorld Class (the main Class) this create the window and moves the ball, it also detects if the ball hits the edge of the window, whne this happens it redirects the ball. I understand how all this code works
I have been asked the following:-
Rather than testing whether or not the ball has hit the wall in the nmain program, we could use inhertitance to provide a specialized forom of Ball. Create a class BoundedBall that inherits from the class Ball. The constructor for this class should provide the height and width of the window, which should be maintained as data fields in the class, rewrite the move method so that the ball moves outside the bound, it automatically reflects its direction. Finally rewrite the BallWorld class to use an instance of BoundedBall rather than ordianary Ball, and elimiante the bounds test in the main program.
I am having trouble with this and I can not get my code to work, I think I may be going in completly the wrong direction with the code can sombody please provide me with a simple working code for both the BoundedBall and ammended BallWorld class, as this will help me understand whare I am going wrong
Ball class
//a generic round colored object that moves
import java.awt.*;
public class Ball {
public Ball (Point lc, int r) { //constructor for new ball
 //ball centre at point loc, radius rad
 loc = lc;
 rad = r;
protected Point loc; //position in window
protected int rad; //radius of ball
protected double changeInX = 0.0; //horizontal change in ball position in one cycle
protected double changeInY = 0.0; //vertical change in ball position in one cycle
protected Color color = Color.blue; //colour of ball
//methods that set attributes of ball
public void setColor(Color newColor) {color = newColor;}
public void setMotion(double dx,double dy)
{changeInX = dx; changeInY = dy;}
//methods that access attributes of ball
public int radius() {return rad;}
public Point location() {return loc;}
//methods to reverse motion of the ball
public void reflectVert(){ changeInY = -changeInY; }
public void reflectHorz(){ changeInX = -changeInX; }
//methods to move the ball
public void moveTo(int x, int y) {loc.move(x,y);}
public void move(){loc.translate((int)changeInX, (int)changeInY);}
//method to display ball
public void paint (Graphics g) {
g.setColor(color);
g.fillOval(loc.x-rad, loc.y-rad, 2*rad, 2*rad);
BallWorld class
//A bouncing ball animation
import java.awt.*; //import the awt package
import javax.swing.JFrame; //import the JFrame class from the swing package
public class BallWorld extends JFrame{
 public static void main (String [] args){
 BallWorld world = new BallWorld(Color.red);
 world.show();
for(int i = 0; i < 1000; i++) world.run();
System.exit(0);
 public static final int FrameWidth = 600;
 public static final int FrameHeight = 400;
private Ball aBall = new Ball(new Point (50,50),20);
 private BallWorld(Color ballColor) { //constructor for new window
 //resize frame, initialize title
 setSize(FrameWidth, FrameHeight);
 setTitle("Ball World");
//set colour and motion of ball
 aBall.setColor(ballColor);
 aBall.setMotion(3.0, 6.0);
 public void paint (Graphics g) {
//first draw the ball
super.paint(g);
 aBall.paint(g);
public void run(){
 //move ball slightly
 aBall.move();
Point pos =aBall.location();
if ((pos.x < aBall.radius()) ||
(pos.x > FrameWidth - aBall.radius()))
aBall.reflectHorz();
if ((pos.y < aBall.radius()) ||
(pos.y > FrameHeight - aBall.radius()))
aBall.reflectVert();
repaint();
try{
Thread.sleep(50);
} catch(InterruptedException e) {System.exit(0);}

Here - you can study this :0))import java.awt.*;
import javax.swing.*;
public class MovingBall extends JFrame {
 mapPanel map = new mapPanel();
 public MovingBall() {
 setBounds(10,10,400,300);
 setContentPane(map);
 public class mapPanel extends JPanel {
 Ball ball = new Ball(this);
 public void paintComponent(Graphics g) {
 super.paintComponent(g);
 ball.paint(g);
public class Ball extends Thread {
 mapPanel map;
 int x = 200, y = 20, xi = 1, yi = 1;
public Ball(mapPanel m) {
 map = m;
 start();
public synchronized void run(){
 while (true) {
 try{
 sleep(10);
 catch(InterruptedException i){
 System.out.print("Interrupted: ");
 move();
public void move() {
 map.repaint(x-1,y-1,22,22);
 if (x > map.getWidth()-20 || x < 0) xi = xi*-1;
 if (y > map.getHeight()-20 || y < 0) yi = yi*-1;
 x = x + xi;
 y = y + yi;
 map.repaint(x-1,y-1,22,22);
 public void paint(Graphics g) {
 Graphics2D g2 = (Graphics2D)g;
 g2.setColor(Color.red);
 g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
 RenderingHints.VALUE_ANTIALIAS_ON);
 g2.fillOval(x,y,20,20);
 g2.dispose();
public static void main(String[] args) {
 new MovingBall().show();
}

Need help with some simple N900 confusions/problem...

Hi All
Just got a UK N900 rx-51_2009se_2.2009.51-1.203.2_pr_203 and I'm rather struggling with some things:
MMS; didnt get any operator settings for MMS, and can't find any way of creating an MMS. Can someone enlighten me?
Can this thing not be used in portrait mode other than for the phone dial pad?
When connecting to e.g. the wireless network they have in the pub, it wants me to push a button on the router, or type a pin into the router - why can't we just have the old fashioned way of "ask the pub staff what the key is, they tell me, and i type it in" - how do I enter the wpa key as a word without this pin/button pushing nonsense?
How can I type my SMS etc with a 3x3 key pad (like a phone) - I really don't like qwerty on phones.. I'm after a portrait mode, can-be-operated-with-just-a-thumb, 3x3 button layout with predictive text (i.e. like every phone in the history of the world) - how do I do that?
I can't find any form of Switch app (to copy contacts and messages off my old device) - how do we do this painlessly?
How do I make the phone forget all the badly spelled words the previous owner seems to have entered?
Can the thing that organises the main screen snap the icons to a larger grid or must I mess around nudging with the stylus till they line up? (They tend to jump out of line just as I remove the stylus from the screen)
I'm sure I'll have more questions later..
Thanks

Answers to my own Qs for the benefits of others:
MMS; didnt get any operator settings for MMS, and can't find any way of creating an MMS. Can someone enlighten me?
No, use fMMS but be aware it's very beta, only allows picture sending with very rudimentary settings and you must change APN manually
Can this thing not be used in portrait mode other than for the phone dial pad?
No, apps have to be portrait specific and only dial pad and the browser (experimental) know of it
When connecting to e.g. the wireless network they have in the pub, it wants me to push a button on the router, or type a pin into the router - why can't we just have the old fashioned way of "ask the pub staff what the key is, they tell me, and i type it in" - how do I enter the wpa key as a word without this pin/button pushing nonsense?
No - a WONTFIX bug. Configure the connection manually in settings instead and you can type the key
How can I type my SMS etc with a 3x3 key pad (like a phone) - I really don't like qwerty on phones.. I'm after a portrait mode, can-be-operated-with-just-a-thumb, 3x3 button layout with predictive text (i.e. like every phone in the history of the world) - how do I do that?
No can do until someone on the maemo team etc creates an on screen keyboard that functions in this way
I can't find any form of Switch app (to copy contacts and messages off my old device) - how do we do this painlessly?
No. Transfer and Sync in Settings can retrieve only what Nokia Content Copier can (contacts, calendar, notes) but it's slightly more painless
How do I make the phone forget all the badly spelled words the previous owner seems to have entered?
Delete the .xxx.dictionary files from /home/user/.osso/dictionaries dir. May need to be root for this, see sites for info on adding repositories, installing rootsh etc
Can the thing that organises the main screen snap the icons to a larger grid or must I mess around nudging with the stylus till they line up? (They tend to jump out of line just as I remove the stylus from the screen)

Help with something simple

Hey guys so I'm trying to write a quick program that should be no problem but I hit a wall and have no idea what's going wrong. The part of my program that isn't working is as follows: I'm accepting a String hexadecimal value as input that can be any number of characters long (for example "FF34CD"). I want to convert this to decimal so what I have done is parsed the input string and assigned each character to a slot in an array called hexArray. I then wrote a loop that will populate decimalArray with the corresponding decimal values for the hex info (i.e. 1=1, 2=2, A=10, B=11, and so on). What I don't understand is that the code works fine for an input that is one character long (i.e. "F"), but as soon as I try a longer input, the decimalArray does not get populated at all. I have tried everything I can think of to make this work and I can't seem to figure it out. Any thoughts?
* Write a description of class FAT here.
* @author (your name)
* @version (a version number or a date)
public class FAT
 // instance variables - replace the example below with your own
 private String[] hexArray;
 private int[] decimalArray;
 private String hexValue;
 int test;
 * Constructor for objects of class FAT
 public FAT(String hexValueIn)
 hexValue = hexValueIn;
 hexArray = new String[hexValue.length()];
 decimalArray = new int[hexValue.length()];
 test = 0;
 * An example of a method - replace this comment with your own
 * @param y a sample parameter for a method
 * @return the sum of x and y
 public int convertDecimal()
 int result = 0;
 int arraySize = hexValue.length();
 for(int i = 0; i < arraySize; i++)
 String entry;
 entry = hexValue.substring(i,i+1);
 hexArray[i] = entry;
 for(int i = 0; i < arraySize; i++)
 if(hexArray[i] == "0")
 decimalArray[i] = 0;
 else if(hexArray[i] == "1")
 decimalArray[i] = 1;
 else if(hexArray[i] == "2")
 decimalArray[i] = 2;
 else if(hexArray[i] == "3")
 decimalArray[i] = 3;
 else if(hexArray[i] == "4")
 decimalArray[i] = 4;
 else if(hexArray[i] == "5")
 decimalArray[i] = 5;
 else if(hexArray[i] == "6")
 decimalArray[i] = 6;
 else if(hexArray[i] == "7")
 decimalArray[i] = 7;
 else if(hexArray[i] == "8")
 decimalArray[i] = 8;
 else if(hexArray[i] == "9")
 decimalArray[i] = 9;
 else if(hexArray[i] == "A")
 decimalArray[i] = 10;
 else if(hexArray[i] == "B")
 decimalArray[i] = 11;
 else if(hexArray[i] == "C")
 decimalArray[i] = 12;
 else if(hexArray[i] == "D")
 decimalArray[i] = 13;
 else if(hexArray[i] == "E")
 decimalArray[i] = 14;
 else if(hexArray[i] == "F")
 decimalArray[i] = 15;
 return result;
}

Yeah, I'm sorry, I should have been more specific, I'm not actually looking at the returned value, I'm simply running the convertDecimal code and then inspecting the decimalArray (as I haven't gotten to the part where I return the decimal value because the decimalArray is not populating correctly).
For some reason it populates completely fine when the input is "F" but not "FF".
Additionally, here are the following things I have done to rule out some issues:
- I put a simple counter to make sure that the loop is still running the appropriate amount of times when the input length is >=2. The loop does run.
- I hardcoded the amount of times the loop should run, rather than using arrayLength, still didn't work.
- I even completely hardcoded, within the loop, the subscript values for the two arrays (i.e. instead of hexArray(i) and decimalArray(i), I actually wrote in: hexArray[0], decimalArray[0], hexArray[1], decimalArray[1], and so on and it STILL did not work. For some reason, whenever the input is longer than 1 character, not one of the IF statements is returning true, even though it (obviously) should be - like I said I even harcoded it to say:
if(hexArray[0] == "F")
 decimalArray[0] = 15;... and so on. And it returns false for the IF statement EVEN IF I inputted, for example "FFFFF" where every single character in the input is an F - how could that if statement possibly be coming back false? And why does it come back true when the input is just 'F'??? I hope this helps clear up the issue I'm having. And thanks in advance for the responses guys you're awesome!
Edited by: 991431 on Mar 3, 2013 7:51 AM
Edited by: 991431 on Mar 3, 2013 8:00 AM
Edited by: 991431 on Mar 3, 2013 8:01 AM

Can someone help with this simple application

I am taking my first java class and there are limited resourses for the class as far as getting help with coding.
Any hoo if any one can point me in the correct direction from the following information listed below I would be greatfull. I am trying to use the set and get methods on the instance veriables and then I am goign to post the results once I get them workign to a JOption pane window.
examples are most welcome thanks
// Invoice.java
// Homework assignment 3.13
// Student Arthur Clark
public class Invoice // public class
String partNumber;// instance veriable quantity
String partDescription;// instance verialbe partDescription
//constructors
public void setpartNumber( String number, String description )
          partNumber = number; //initalize quantity
          partDescription = description; // initalize partDescription
     }// end constructors
//method getpartNumber
public String getpartNumber()
          return partNumber;
     }//end method getpartNumber
public String getpartDescription()
          return partDescription;
     }// end method getpartDescription
public void displayMessage()
     //this is the statement that calls getpartNumber
     System.out.printf(" part number # \n%s!\n the description", getpartNumber(), getpartDescription() );
} // method displaMessage
}// end method main
// Fig. 3.14 InvoiceTest.java
// Careate and manipulate an account object
import java.util.Scanner;
import javax.swing.JOptionPane;//import JOptionPane
public class InvoiceTest{
     // main method begins the exciution of the program
     public static void main ( String args [] )
          // create Scanner to obtain input from mommand window
          Scanner input = new Scanner ( System.in );
          // create a Invoice object and assig it to mymethod
          Invoice myMethod = new Invoice();
          Invoice myMethod2 = new Invoice();
          // display inital value of partName, partDescriptoin
          System.out.printf( "inital partname is %s\n\n", myMethod.getpartNumber() );
          // prompt for and read part name, partDescription
          System.out.println( "please enter the Part Number:" );
          String theNumber = input.nextLine(); // read a line of text
          myMethod.setpartNumber( theNumber ); // set the part name with in the parens
          System.out.println();// outputs blank line
          myMethod.displayMessage();
          System.out.println( "please enter the Part Description" );
          String theDescription = input.nextLine(); // read a line of text
          myMethod2.setpartDescription( theDescription );// set the part description
          System.out.println();// outputs blank line
          myMethod2.displayMessage();
     }// end main mehtod
}// end class

//constructors
public void setpartNumber( String number, String description )
          partNumber = number; //initalize quantity
          partDescription = description; // initalize partDescription
     }// end constructorsThe above code is not a constructor. You do not include a return type, void or anything else. Also, the constructor should be called the same as your class.
public Invoice( String number, String description )
          partNumber = number;
          partDescription = description;
     } Another thing, comments should only be used when it isn't bleedingly obvious what your code is doing.
P.S. is your middle initial C?

Im DROWNING! need help with a simple java assignment! plz someone help me!

i need help with my java assignment, with validating a sin number. easy for must who know java. im drowning... please help!

You will need to store each digit of the social insurance number in a field of its own. To validate the entry you will:
1. Multiply the 2nd, 4th, 6th and 8th digit by 2.
2. If the product of any of the four multiplications result in a value greater than 9, add the two resulting digits together to yield a single-digit response. For example 6 * 2 = 12, so you would add the 1 and the 2 to get a result of 3.
3. Add these four calculated values together, along with the 1st, 3rd, 5th, and 7th digits of the original number.
4. Subtract this sum from the next highest multiple of 10.
5. The difference should be equal to the 9th digit, which is considered the check digit.
Example of validating S.I.N. 765932546
1st digit 7
2nd digit (6*2 =12 1+2=) 3
3rd digit 5
4th digit (9*2 = 18 1+8 =) 9
5th digit 3
6th digit (2*2 = 4) 4
7th digit 5
8th digit (4*2 = 8) 8
Total 44 next multiple of 10 is 50
50-44 = 6 which is the 9th digit
Therefore the S.I.N. 765932546 is Valid
********* SIN Validation *********
Welcome - Please enter the first number: 120406780
Second digit value multiplied by 2 4
Fourth digit value multiplied by 2 8
Sixth digit value multiplied by 2 12
Eighth digit value multiplied by 2 16
Value derived from 6th digit 3
Value derived from 8th digit 7
The total is 30
Calculated digit is 10
Check digit must be zero because calculated value is 10
The SIN 120406780 is Valid
this is my assignemtn this is what i have! i dont know where to start! please help me!
/* File: sinnumber.java
 Author: Ashley
 Date: October 2006
 Purpose: Lab1
import java.util.Scanner;
public class Lab1
 public static void main(String[] args)
 Scanner input = new Scanner(System.in);
 int sin = 0;
 int number0, number1, number2, number3, number4, number5, number6, number7, number8;
 int count = 0;
 int second, fourth, sixth, eighth;
 System.out.print("\t\n**********************************");
 System.out.print("\t\n**********SIN Validation**********");
 System.out.print("\t\n**********************************");
 System.out.println("\t\nPlease enter the First sin number: ");
 sin = input.nextInt();
 count = int.length(sin);
 if (count > 8 || count < 8)
 System.out.print("Valid: ");
 }

Help with a simple configuration to connect a pc and router

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