> That's why mostly, shaping is done on the perimeter, where the LAN
> exceeds the capabilities of the WAN line. Any shaping done should
> to the internal nodes to slow down (I don't recall how traffic
> implemented), and in essence, help control the flow through the pipe.
ICMP source quench was supposed to solve the problem by letting an
intermediate system send a message to an end system and get it to
throttle its traffic. Turned out that it ended up making the traffic
level oscillate. (While not particularly useful, it was fun to watch.)
Today the solution is to just throw packets away and let TCP cope.
Most TCP implementations assume that lost packets are due to network
congestion and close the transmit window. It is surprising just how
well TCP will converge on proper throughput.
(I used to design routers in a previous life.)
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