Hi!

> [ Upstream commit 213ad73d06073b197a02476db3a4998e219ddb06 ]
> 
> Multiple complaints have been raised from the TFO users on the internet
> stating that the TFO blackhole logic is too aggressive and gets falsely
> triggered too often.
> (e.g. https://blog.apnic.net/2021/07/05/tcp-fast-open-not-so-fast/)
> Considering that most middleboxes no longer drop TFO packets, we decide
> to disable the blackhole logic by setting
> /proc/sys/net/ipv4/tcp_fastopen_blackhole_timeout_set to 0 by
> default.

I understand this makes sense for mainline, but should we have this in
stable? Somebody may still be using broken middlebox with their
"stable" server.

Best regards,
								Pavel

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