ServerSocket with multiple NIC

Question

I need? (want!) to write a server type application that will listen to requests that arrive via 2 (or more) NICs.
My problem is that the program seems to ignore the second card.
OK some code...
waiter1= new Waiter("123.456.789.12");
waiter1.start();
waiter2= new Waiter("234.567.890.123");
waiter2.start();
class Waiter extends Thread{
private String IPaddress;
public Waiter(String IPAddress){
this.IPAddress=IPAddress;
public void run(){
System.out.println((NetworkInterface.getByInetAddress(InetAddress.getByName(IPAddress)).getName())
ServerSocket sSocket=new ServerSocket(1234,0,InetAddress.getByName(IPAddress));
while(forever){
Cover cover=new Cover(sSock.accept());
cover.start();
class Cover extends Thread{
private Socket sock;
public Cover(Socket sock){
this.sock=sock;
public void run(){
// do all the usefull stuff
it gives the right system output, ie..
eth0
eth1
requests are handled ok on the first IP addy, but not on the second.
Ive seen a bug report relating to MultiCast sockets (seems like the argument is ongoing), but nothing about ServerSockets
btw the code is a transcript, working version compile s and runs :-)

Answer 1

Well.. if you want to listen to anything on any nic you could just start a ServerSocket on a port only...
is there anything else listening on the second IP at port 1234? or whichever port you're using?
put try / catch / e.printStackTrace() around where you're creating the serversocket so you can see if the socket is actually available..
if you don't like the first approach, the accept() method of a single serverSocket can be "listened" to by as many threads as you want... so you can still have it multithreaded
ah and the address "0.0.0.0" essentially means all available IP's ... so if you create a serversocket on "0.0.0.0" port 80 you'll recieve everything going to port 80