Re: [Cse461] Fishnet transport interoperability

From: Janet Davis (jlnd_at_cs.washington.edu)
Date: Wed Mar 10 2004 - 16:05:44 PST

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    On Wed, 10 Mar 2004, Eileen Hash wrote:
    > On Tue, 9 Mar 2004, Janet Davis wrote:
    >
    > > 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).
    > >
    > Shouldn't the corresponding acknowledgement be (seq + payload.length) ?
    >
    > if seq = 3, and the length of the packet is 4 bytes, the packet holds data
    > bytes 3 through 6, and the ack should be 7 (for the next data byte
    > expected). 7 = seq + bytes, not seq + bytes + 1.

    Yes, my goof. Those off-by-one errors can be a real pain. Thanks for the
    correction.

    Cheers,
    Janet 

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