Hello!

>  08 0A       : Timestamp Option(RFC2018)
>  01 B6 9C EC : Timestamp Value
>  00 00 00 00
and
>  08 0A       : Timestamp Option(RFC2018)
>  07 2A 1C 5D : Timestamp Value
>  01 B6 00 EC : Timestamp Echo Reply


> 1. Why my linux does not recognize connection ACK ?

I think it did not receive SYN-ACK. Look at /proc/net/snmp, field
TcpInErrs or enable NETDEBUG at the end include/net/sock.h.
I bet, someone corrupted packet and it has wrong checksum,
look at zeroed byte in "01 B6 00 EC : Timestamp Echo Reply"
                              ^


> 2.
et al. are  not essential. Option order does not matter.

Alexey Kuznetsov

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