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SubjectRe: [PATCH] document ECN in 2.4
Oliver Xymoron wrote:
> I'm still not sure why it's been decided not to do fallback or how this
> whole situation is any different from path MTU discovery.

It has:

"Changes to make to the ECN RFC before it goes to proposed standard:
* If the TCP host receives no response to a SYN packet sent
with the TCP ECN_ECHO and CWR flags set, to indicate
ECN-capability, then the sender should send its second
SYN packet without these flags set. This is because
there are several deployed TCP implementations that
don't respond to SYN packets with these ECN-related flags set"
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