[e2e] Can feedback be generated more fast in ECN?

[David P. Reed]

At 10:01 AM 2/21/01 -0800, Christian Huitema wrote:
>Then, there is this little detail that if the sender is behind a NAT, or
>a firewall, it will probably not receive the ICMP/SQ packets...
>
Almost certainly not.  And VPNs don't get either SQ or ECN, most likely.

Which illustrates the general truth that underlying congestion, on links or 
internal to networks, may not propagate up to TCP in all cases, so the real 
detection of congestion is the lack of timely acknowledgments.  All other 
schemes are "hints" and should not be endowed with magic powers.


- David
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