How do I listen on two ports?

How do I listen on two ports?

For each port that you want to listen to, you:

1. Create a separate socket with socket .
2. Bind it to the appropriate port with bind .
3. Call listen on the socket so that it’s set up with a listen queue.

Can a server have multiple ports?

5 Answers. It’s not possible to for a single instance of ServerSocket to listen to multiple ports. You can of course have multiple ServerSocket s. However, as you already know, ServerSocket.

What does listening on port mean?

network-programming listener port. Does “Listening” a port means a continuous polling to that port or a discrete polling or an interrupt driven process.

How many port can be listened by an application?

TCP/IP Ports There are a number of common networking ports that are used frequently. Ports 0 through 1023 are defined as well-known ports. Registered ports are from 1024 to 49151. The remainder of the ports from 49152 to 65535 can be used dynamically by applications.

Can you bind a socket to multiple ports?

Is it possible to bind one process to multiple ports? Yes. Yes, each listening (bound) port is serviced by a separate socket (as are all the connections made from each listening port).

Is server listening on port?

On the server itself, use netstat -an to check to see which ports are listening. From outside, just use telnet host port (or telnet host:port on Unix systems) to see if the connection is refused, accepted, or timeouts.

Can a single client listen on multiple ports?

Single client, Multiple server, sockets sharing the same port. Server is listening a particular port and more then one client can connect Single Server, Multiple Clients UDP Application in C (Winsock)

Why are two applications listening to the same port?

“one application listening on a single port” that’s the reason why ports exist — to allow multiple applications to share the network without conflicts. – S.Lott Nov 7 ’09 at 19:41 One listener per port per IP address. Adding another network interface is a way to get a second IP address.

How to listen on multiple ports in Linux?

If you are looking to scan your destination through multiple local ports, you can use the -p option. That tells netcat to look through that local port, much similar to when telling it to setup a backdoor listener on said port. You can also string a bunch of those ports together if they are split up. Here is an example I just used.

Can two sockets listen to the same port?

Multiple UDP sockets all bound to the same port can all co-exist provided either the same condition as at (1) or they have all had the SO_REUSEADDR option set before binding. TCP ports and UDP ports occupy different namespaces, so the use of a port for TCP does not preclude its use for UDP, and vice versa.