On 28.12.2015 6:15, Patrick Kelsey wrote:
> This is explained in the top comment in sys/netinet/tcp_fastopen.c, but
> I will repeat it here and elaborate a little.  It is disabled by default
> in the kernel build as a conservative measure until it is exercised more
> widely, given the modifications it introduces to the TCP state machine
> code, syncache code, etc.  When you do enable it in the kernel build
> (and after some point in the future when it is enabled by default),
> there is still a sysctl that governs its availability in the system that
> must be enabled before it can be used.
>  
> -Patrick

Thanx, if I understand it correctly, is not ready for real use yet but
just for experiments. See my other comment about TCP_RFC7413_MAX_KEYS

-- 
http://ache.vniz.net/
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