Re: I-D Action:draft-rosenberg-internet-waist-hourglass-00.txt]

[jnc at mercury.lcs.mit.edu (Noel Chiappa)]

<Apologies that this ia a bit old, but it repeats a - sadly - very common
misperception that is worth correcting yet again.>

    > From: Iljitsch van Beijnum <iljitsch at muada.com>

    > If a protocol doesn't need port numbers or a UDP-like checksum (i.e.,
    > either no checksum or a better one)

UDP does provide for packets with no checksum. Read the spec:

  "An all zero transmitted checksum value means that the transmitter
  generated no checksum (for debugging or for higher level protocols that
  don't care)."

(Minor pet peeve: we did blow it very microscopically, IMO; the reserved
value should have been all ones, not all zeros, as all ones could never be a
legitimate output from the checksum-generation step, but that's a minor
quibble.)

	Noel
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