[ih] UDP Length Field?

[Vint Cerf]

Noel,
yes, we did the split to support real-time and then concluded that UDP was
the best way to present the "service" vs running over raw IP.

v


On Sun, Nov 29, 2020 at 1:46 PM Noel Chiappa via Internet-history <
internet-history at elists.isoc.org> wrote:

>     > From: Craig Partridge
>
>     > Recall that the creation of UDP meant TCP and IP had to be split
> apart
>
> No. The TCP/IP split _long_ predates the creation of UDP. The former is
> already apparent as of IEN-21, "TCP 3 Specification" (see pages 56 and 59
> for
> the IP and TCP header formats), from January 1978. UDP is IEN-71, from
> 21-Jan-79 (and as I recall, there was not a lengthy discussion before it
> came
> out).
>
> Oh, looking at IEN-71, in the packet format description, it says "data,
> padded
> with zero octets at the end to make a multiple of two octets". So Vint's
> comment
> about the length was right on target.
>
> It mentions host name lookup (_not_ DNS; it was servers which had a copy of
> the host table) as the intended appplication. Time was also early, IIRC. My
> recollection is that TFTP was the first non-datagra protocol (i.e. not
> single-packet transactions) to make use of UDP, but my memory mmay be
> failing
> me there.
>
>    Noel
>
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> Internet-history at elists.isoc.org
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>


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