From owner-freebsd-net@FreeBSD.ORG  Fri Aug 12 05:34:47 2005
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Date: Fri, 12 Aug 2005 14:34:30 +0900 (JST)
Message-Id: <20050812.143430.37456105.Noritoshi@Demizu.ORG>
From: Noritoshi Demizu <demizu@dd.iij4u.or.jp>
To: jha miku <jha0147@yahoo.com>
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Cc: freebsd-net@freebsd.org
Subject: Re: Question regd timestamp option
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> Are there other situations when timestamp gets disabled?

In case of active open and net.inet.tcp.rfc1323 is set to non-zero,
one possibility is TCP_NOOPT is turned on by setsockopt().
But I do not know which applications use TCP_NOOPT.

Regards,
Noritoshi Demizu


> From: jha miku <jha0147@yahoo.com>
> To: freebsd-net@freebsd.org
> Subject: Question regd timestamp option
> Date: Thu, 11 Aug 2005 19:08:13 -0700 (PDT)
>
> 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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