Java Socket bind() and connect() method

Question

Hi,
I'm running a windows xp machine and have set it up (using the raspppoe protocol) to make simultaneous dial-up connections to the internet. Each of these dial-up connections then has its own IP address.
When I create a new Socket, bind it to one of these IP addresses and invoke the connect() method (to a remote host), the socket times out. Only when i bind it to the most recent dial-up connection that has been established, the socket connects.
I'm welcome for any ideas :)
thanks

Answer 1

If you'll excuse the lengthy post it has alot of code and outputs :)
Ok Wingate really doesnt have much to do with the program, let me get back to the point and then post the code I have.
Goal of the application:
To use multiple simultaneous dial-up interfaces connected to the internet by binding each of them (using Socket class .bind() method) to its associated Socket object.
Method:
I use the RASPPPOE protocol for Windows XP to allow these multiple simultaneous ADSL dial-up connections. Each of these dial-up instances gets assigned an IP address. I use the NetworkInterface class to retrieve these interfaces/IP addresses and then run a loop to bind each Socket to its associated interface.
The code I am pasting here is over-simplified and is just to illustrate what it is i'm trying to do.
Firstly, this is a cut & paste of the tutorial from the Java website on how to list the Network interfaces on an operating system and the associated output:
import java.io.*;
import java.net.*;
import java.util.*;
import static java.lang.System.out;
public class ListNIFs
    public static void main(String args[]) throws SocketException
        Enumeration<NetworkInterface> nets = NetworkInterface.getNetworkInterfaces();       
        for (NetworkInterface netint : Collections.list(nets))
            displayInterfaceInformation(netint);       
    static void displayInterfaceInformation(NetworkInterface netint) throws SocketException {
        out.printf("Display name: %s\n", netint.getDisplayName());
        out.printf("Name: %s\n", netint.getName());
        Enumeration<InetAddress> inetAddresses = netint.getInetAddresses();       
        for (InetAddress inetAddress : Collections.list(inetAddresses))
            out.printf("InetAddress: %s\n", inetAddress); 
        out.printf("Up? %s\n", netint.isUp());
        out.printf("Loopback? %s\n", netint.isLoopback());
        out.printf("PointToPoint? %s\n", netint.isPointToPoint());
        out.printf("Supports multicast? %s\n", netint.supportsMulticast());
        out.printf("Virtual? %s\n", netint.isVirtual());
        out.printf("Hardware address: %s\n", Arrays.toString(netint.getHardwareAddress()));
        out.printf("MTU: %s\n", netint.getMTU());       
        out.printf("\n");
}For which the output is:
Display name: MS TCP Loopback interface
Name: lo
InetAddress: /127.0.0.1
Up? true
Loopback? true
PointToPoint? false
Supports multicast? true
Virtual? false
Hardware address: null
MTU: 1520
Display name: Intel(R) PRO/Wireless 3945ABG Network Connection - Packet Scheduler Miniport
Name: eth0
InetAddress: /192.168.1.10
Up? true
Loopback? false
PointToPoint? false
Supports multicast? true
Virtual? false
Hardware address: [0, 25, -46, 93, -13, 86]
MTU: 1500
Display name: WAN (PPP/SLIP) Interface
Name: ppp0
InetAddress: /196.209.42.125
Up? true
Loopback? false
PointToPoint? true
Supports multicast? true
Virtual? false
Hardware address: null
MTU: 1492
Display name: WAN (PPP/SLIP) Interface
Name: ppp1
InetAddress: /196.209.248.25
Up? true
Loopback? false
PointToPoint? true
Supports multicast? true
Virtual? false
Hardware address: null
MTU: 1492
Display name: WAN (PPP/SLIP) Interface
Name: ppp2
InetAddress: /196.209.249.4
Up? true
Loopback? false
PointToPoint? true
Supports multicast? true
Virtual? false
Hardware address: null
MTU: 1492The part to take notice of is the three WAN (PPP/SLIP) Interfaces named ppp0, ppp1 and ppp2. They are simultaneous dial-up connections to the internet, each with a unique IP. I will now attempt to use one of these interfaces to establish a connection to www.google.com on port 80 (purely for illustration).
In the code printed below, I simply hard coded the above listed IP address of the interface for simplification:
import java.net.*;
import java.io.*;
public class SockBind {
     private Socket connection;     
     private void start() throws IOException
          while (true)
               try {
                    connection = new Socket();
                    connection.bind(new InetSocketAddress("196.209.42.125", 12345));
                    connection.connect(new InetSocketAddress("www.google.com", 80));
                    connection.close();
               } catch (SocketException e) {
                    System.err.println(e.getMessage());
     public static void main(String args[])
          try {
               SockBind s = new SockBind();
               s.start();
               System.out.println("Program terminated.");
          } catch (IOException e) {
               e.printStackTrace();
               System.exit(1);
}Once the program reaches the connection.connect() method, it pauses a while until it throws a SocketException with a "timed out" message. I have already tested the dial-up connection (using a wingate, which is irrelevant) just to confirm that the connection is in working order.
EJP if you have any suggestions I will welcome it, many thanks :)