[Cse461] Fishnet transport interoperability

From: Janet Davis (jlnd_at_cs.washington.edu)
Date: Tue Mar 09 2004 - 14:49:08 PST

  • Next message: Janet Davis: "Re: [Cse461] Fishnet transport interoperability"

    For interoperability, the sequence number in a transport data packet
    should be the number of the *first* byte in the payload. The
    corresponding acknowledgement number then is (seq + payload.length + 1).

    Similarly, if you are using stop-and-wait, when you get (ACK n), the next
    packet you send will have (SEQ=n).

    I've heard recently that some people are using the last byte rather than
    the first byte for the sequence number. It's pretty much arbitrary
    whether the sequence number represents the first or the last byte in the
    packet, but it's important for interoperability that we all agree.

    Cheers,
    Janet 

    -- 
Janet Davis
jlnd_at_cs.washington.edu
http://www.cs.washington.edu/homes/jlnd/
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