On Tue, May 22, 2012 at 1:28 PM, Mohan Sundaram <[email protected]> wrote:
>> Agree. Like ECN not being honoured, many routers have not implemented TCP
> window scaling.

Routers need not participate or even be aware of it.

TCP window scaling works between source/destination. TCP window is an
integral part of an kernel's network stack so it's always available.

Bandwidth shaping devices monitor and control TCP/UDP flows. TCP window
is resized on a per-flow and per-direction basis to control bandwidth usage.

- Raja
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