In case of active open, the SYN segments always have
timestamp enabled, since the RFC flg is set. But,
Currently, I am seeing some SYN segments without
timestamp option.
The only condition that I am aware of when timestamp
is
disabled, is on sending the 3rd SYN in retransmit code
when the timestamp gets disabled.
looking at the tcpdump, it is unclear why the SYNs are
sent during active open without timestamp option.
Are there other situations when timestamp gets
disabled?
Please let me know.
Thanks.
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