Dear all, 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 same behaviour. Best regards Michael
linux.pcapng
Description: Binary data
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