Hi Don,

On Wed, 19 Aug 2015 19:06:25 +0000
"Smith, Donald" <[email protected]> wrote:

> I am not aware of anyone rate-limiting UDP itself. Specific ports
> using UDP yes but not UDP as a protocol.

As a specific IP protocol, it happens and it has happened.  And not
just with UDP.  If you're not on NANOG, I described what was done in
a university environment I was at years ago:

  <https://mailman.nanog.org/pipermail/nanog/2015-July/078010.html>

While perhaps not on transit networks, some networks have UDP dropped
by their upstream(s) or at their own "border", primarily as a means to
mitigate all the UDP-based amplified reflection traffic they might
otherwise have to carry.

Its not very elegant perhaps, but it does happen and seemingly the
trade-off some find to be worth it.

John

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