Re: Satellites running IP

From: William Ivancic ([email protected])
Date: Fri Jun 14 2002 - 15:07:18 EDT

  • Next message: Lloyd Wood: "Re: Satellites running IP"

    >
    >
    >(SIW1 has html conversions of all slides online; SIW2 is wholly
    >powerpoint. Really, I'd like to see pdfs of the lot - all the
    >read-anywhere-platform-independent convenience of one, all the
    >download-a-single-file convenience of the other.)

    I'll get around to making PDFs sometime for the appropriate
    presentations. I've been using animation in some presentations which
    doesn't translate well to PDF. But, for some things, animation is very
    effective to make the point. I don't think the HTML conversion works for
    animations.

    > > By the way, SCPS-TP advertises TCP's protocol number for reliable transport
    > > protocol selections. It does this even if the pure rate-based transmission
    > > is used. IMO, this is terrible as it make QoS and queue management very
    > > difficult.
    >
    >QoS and queue management shouldn't depend on what traffic is, but on
    >what traffic does imo - otherwise there's a semantic gap.

    I agree, but, it takes far more energy to look at per flow information and
    determine the traffic pattern and then put it in a queue. Assuming that
    certain protocols react in certain ways is much easier and manageable -
    albeit somewhat dangerous.

    > When rate-based, SCPS-TP is still sending TCP-style packets, so the
    >protocol identifier is valid.

    I disagree. IMHO, one should not knowingly advertise a protocol number if
    one is not conforming to those protocol characteristics. Just because the
    header is the same style does not mean that it is the same
    protocol. IMHO, SCPS should advertise it's own protocol number when
    running rate-based, no congestion control.

    Will

    =======================================
    Will Ivancic
    NASA Glenn Research Center
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