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Editorial Team
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Asked: 2026-06-10T07:20:31+00:00

I am in the process of developing a peer to peer app, I am

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I am in the process of developing a peer to peer app,
I am a bit confused by the following scenario:

Lets say my application will use an outgoing port 1863 – which is also used for msn messenger(if this is not the port lets assume it is)

Now, client executes my app and connects to my server at port 1863.

I am a bit confused if this is going to produce any problems.
I know that 2 apps can use same port for outgoing communication. But what happens to the data coming back?

Also, does my client need to open port for my app to run correctly??

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1 Answer

  1. Editorial Team

    I know that 2 apps can use same port for outgoing communication. But
    what happens to the data coming back?

    That’s exactly the problem the source port solves. The peer can always differentiate between 2 connections based on it. When it sends replies, what was the source port now becomes the destination port allowing the original receiver to correctly pass data to the rightful processes.

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