[e2e] Why was hop by hop flow control eventually abandonded?

Noel Chiappa jnc at mercury.lcs.mit.edu
Tue Jul 16 08:14:37 PDT 2013

    > From: Detlef Bosau <detlef.bosau at web.de>

    > the decision to abandon hop by hop flow control
    > ...
    > Does anyone happen to know, whether this was decision for a concrete
    > reason and the rational behind it? Or did this "simply happen"?

Probably the internet-history list is a better place to ask this?

I don't know for sure, but having arrived on the scene shortly thereafter,
and knowing intimately what packet switches were like then, my _guess_
is that it had to do with state.

It seems to me that to be able to do hop-by-hop flow control, you have to
have some state in the switches, yes? (I can't see a way to do it without.)

And in a 'smallish' network, like the ARPANET, it's reasonable to have that
state. But when you're talking about (potentially) a much bigger network, as
the Internet even then was planned to be, the amount of state potentially
needed would quite likely have been too much for the switches of the day.


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