1

When we send the same data over a network twice, does this means that we are sending the same packets twice?

I am trying to understand how my decoder works, so I command using an application on phone, and I click on the buttons: power on, power off, and power on once again.

so does this mean the packets that are sent the first and last time are the same or there are some differences like the headers?

  • 1
    Welcome to Network Engineering! We need more information to help you. What kind of packets and where are they going? – Ron Trunk May 23 at 15:52
  • @RonTrunk Thank you and I'm sorry for my delayed response. I'm sending packets from my phone to my decoder (which contains a web server so I can send http/https requests) through a proxy (man in the middle). – yosra May 24 at 8:23
3

If I understand your question correctly, you want to know if the UDP and IP headers are identical if you send the same data over UDP twice.

I think this will depend on the operating system; I just tested this with Linux:

Linux will put an individual "ID" field in the IP header. So if you send the same UDP data twice, the IP header of the two packets contain a different "ID" field.

I assume that the same is true if a TCP packet is re-sent.

  • Yes, that was exactly what I meant, Thank you for your response. – yosra May 24 at 8:30
2

When we send the same data over a network twice, does this means that we are sending the same packets twice?

Define "the same". Any copy of digital data is identical to any other copy.

Define "data". For user data encapsulated by a transport-layer protocol: no, the packets are not the same usually (they might though, e.g. with UDP). For an entire packet that is resent, it's the same packet (see above).

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.