SYSC 3303 Lecture Notes - Lecture 8: Attachmate, Illegal Opcode, Trivial File Transfer Protocol
26 Oct 2018
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Topic 13: tftp client-server design part 2: wrq errors, cause: the server receives a message through port 69 that is not a properly formed. Still doable when considering error packets: an error while writing the file will result in an ack packet and an error packet being sent for the same data packet. If data blocks are buffered before being written, the error packet associated with a particular data packet may be prepared and sent well after the acks for subsequent. If client times out while waiting for a packet, it retransmits the last data packet it sent: coupler component set: sets a timer, wait: wait for cancellation of waiting condition (by normal reception of. Timeouts and datagramsockets: recall we do not need a retransmission timer on the side that sends ack packets because a retransmitted ack is ignored. Ucm, we do not need to show timeout/retransmit on the server side. (opposite for read connection)
