I need to implement a Peer To Peer File Transfer.
What protocol should I use? TCP or UDP? And why?
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I need to implement a Peer To Peer File Transfer.
What protocol should I use? TCP or UDP? And why?
TCP is generically the best way to go when you want to ensure that your data gets to its intended destination with appropriate integrity.
In your case I would personnally choose tcp, because you will probably end up reimplementing tcp in some form inside of your udp packets otherwise (ask for block (syn), answer: i have block (syn ack), ok send it to me (ack)…data: (push ack)… ok done: (rst))
Also generically speaking, udp is the way to go when you want to broadcast, and you dont really care if the data gets there or not, meaning there is either high redundancy or low importance/integrity… since files require high integrity, it doesn’t make a lot of sense to go UDP, again, unless you want to go through the extra work.
The only upside to udp would be the fact that is stateless, which could have some good implementations in a file sharing program.
Bottom line… go with your heart…