It is not implemented per se, but there exists support for
receiving data (Push) with connection startup SYN packet.
This means that lattest 2.1.* kernels will do something sensible
with incoming T/TCP packet. It does not mean there exists
T/TCP support. Especially it does NOT mean that there exists
user-space support for T/TCP per RFC 1644, or its FreeBSD
Systems that don't support T/TCP are known to behave at least
erratically. Some systems even appear to HANG for a while when
they receive T/TCP SYN+Push. Most systems will just send back
SYN+ACK, and wait for the third ACK to establish the connection.
/Matti Aarnio <email@example.com>
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