CODEWITHSUNDEEP
javasocketsnetwork-programming
hereForLearing
hereForLearing

Reputation: 1288

can I find all running instance of my server on the local network?

I have a server application (that simply starts a Server Socket) and a client application, let's suppose that I have several server application instances started on the same local network, is there a way for my client application to list all the running servers on the local network (maybe by some kind of name or id that I can define ?) ? Thank you

Upvotes: 0

Views: 501

Answers (2)

Remy Lebeau
Remy Lebeau

Reputation: 595711

This is commonly solved by using either

  • a UDP subnet broadcast, where each server instance opens a listening UDP socket on a given port, and then replies to packets received on that port. Each reply is sent back to the sender it was received from, and can contain whatever identification data you want. The client can then broadcast a packet on that port, and gather up any replies it receives from servers that are connected to the same subnet.

  • any number of available network service discovery protocols, such as SSDP.

Upvotes: 2

Vishwa Ratna
Vishwa Ratna

Reputation: 6390

Use nmap and zmap if you are on linux.

To see open ports on your machine:

Windows: use CMD with admin rights

 netstat -a -b

-a Displays all connections and listening ports

Powershell:

-Id (Get-NetTCPConnection -LocalPort portNumber).OwningProcess

Upvotes: 1

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