UDPfiletransfer
Networks 1 project
Bachelor in Applied Information Technology 2nd year, University of Luxembourg
Server to n clients file transfer using UDP and transmitting using the Go-Back-N Algorithm.
Arguments:
- server:
<portNumber> <numberOfClients> <fileWanted> <windowSize> - client:
<portNumber> <numberOfClients> <indexOfClient> <chanceOfPacketLost(/100)> <windowSize>
Features:
- intuitive launcher to launch a number of clients and set the arguments to each
- statistics file provided at the end
- simulates packet loss and treats the case
- every packet needs to first get(safely) to all clients and then the next one is read from the initial and sent to everyone
- uses
go-back-Nmethod: starts sending N packets to each client and treats them as following:- if one packet is lost for client i, all next packets in the window will be ignored
- after all clients finished receiving, the window is moved by the number packets received by everyone, and retransmission may start for only the packets missed by a certain client
Bugs:
- may crash if window size too big
- may crash if number of packets too big(files of tens of GB tho)
- Working kind of concurrently(when it comes to listening for confirmations), but not fully since parelizing all threads made problems.