Find out where traffic from a particular program goes?

Question

Traffic analysis

Good evening, tell me, there is a certain program, it sends requests to the server, where exactly - it is not known, but you need to find out. How can this be done?
And another question right away, if I catch a request, how can I repeat it more than 20 times within a minute? More specifically than.
Thank you!

Answer 1

WireShark

Answer 2

Protocol dependent. Not everything in the world works over HTTP / HTTPS, although it is the easiest for a beginner.
For HTTP/HTTPS, use the Fiddler sniffer, as far as I know - the most convenient for this.
But if it doesn’t work out, then option 2: either the requests bypass the Fiddler proxy (then you need to force traffic through the proxy, for example, like Proxifier can), or it’s not HTTP / HTTPS at all.
Then WireShark, but it's already hard, requires experience in TCP (bare sockets - lower level than HTTP / HTTPS; there are different protocols based on TCP, but not HTTP / HTTPS, for example, this is XMPP) ...
You should always start with HTTP /https.
> if I catch a request, how can I repeat it more than 20 times within a minute?
For HTTP / HTTPS requests, there are some tools in almost all languages, both standard and third-party.
But they have somewhat limited functionality. If you want a complete one, then we make a bicycle: we ourselves compose a packet and send it again via TCP, then we also receive a packet with a response - we get an HTTP request. For TCP, there are also many where there are funds.
About "20 times a minute" - xs, it was not necessary.