TCP Fast Open Linux behaviour
tuexen at freebsd.org
Wed Jan 17 21:55:41 UTC 2018
at the last Telco the following question was raised:
When Linux is acting as TCP client using TCP fast open,
does it accept user data sent with the SYN-ACK.
I tested it with the Linux kernel 4.9.77, which is the current
LTS release and figured out that the data sent with the SYN-ACK
is accepted. See the attached .pcapng file.
The current Ubuntu 17.10 using the kernel 4.13.0 shows the
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