CODEWITHSUNDEEP
javasocketssecurityportrouter
Goel Nimi
Goel Nimi

Reputation: 37

How can I use java sockets to communicate between different networks?

I have java programs for my client and server, and they work fine within the same wifi network. But I need the clients to be able to connect to the server from the open internet. In questions like these

How to connect client and server with the help of ip address which are connected to internet through different wifi?

https://coderanch.com/t/667020/java/Socket-connections-networks

the solution is to manually reroute a port to the server from the router, making it open to connections from the outside. Is there a way to do this with just software on the server? I don't understand why manually dedicating ports is necessary since of course other applications on my computer (like games) that I install communicate with their servers back and forth without me having to manually go in and flip switches.

How can I achieve this with just software running on my server?

If there isn't another way, how do other applications communicate openly without manual router changes, and will opening up ports through my router result in security issues?

Upvotes: 2

Views: 1744

Answers (1)

Ramsay Domloge
Ramsay Domloge

Reputation: 705

You would need to change the architecture of your application. Currently, your server is behind a firewall which blocks connections from the internet - you want this! If you allowed all traffic from the internet to connect indiscriminately to your server, it would be very vulnerable to attack.

Other applications install and communicate without port-forwarding because the developer provides a server on the internet to act as a proxy between clients. The client connects out to the internet which is generally not blocked on home networks. Internal connections going out are considered less harmful than connections coming in.

Upvotes: 1

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