From: Casey Carter <Casey@Carter.net>
To: "David S. Miller" <davem@redhat.com>
Cc: Bartek Wydrowski <b_wydrowski@yahoo.com.au>,
netdev@oss.sgi.com, kuznet@ms2.inr.ac.ru
Subject: Re: RFC1323. No timestamping if SYN timestamp = 0. Bug or Feature?
Date: Fri, 24 Oct 2003 08:16:13 -0500 [thread overview]
Message-ID: <3F99261D.5030008@Carter.net> (raw)
In-Reply-To: <20031023013748.0dd168db.davem@redhat.com>
David S. Miller wrote:
>It is impossible to comply to RFC1323 if we allow TSval in the
>initial SYN packet to be zero, from RFC1323:
>
> When TSecr is not valid, its value must be zero.
>
>It is therefore impossible to accept TSval as zero, because
>our TSecr echo of that timestamp would be also zero and thus
>invalid.
>
>That is why we reject zero timestamps in the initial SYN packet.
>
>
Note that the text does not say "When TSecr is zero, it is invalid."
You are reversing the conditional statement "not valid implies zero" to
"zero implies not valid." I don't think that the intent of this text in
the RFC is to forbid the use of zero as a timestamp, but only to assert
that the value should be set to zero by default.
--
Casey Carter
Casey@Carter.net
ccarter@cs.uiuc.edu
AIM: cartec69
prev parent reply other threads:[~2003-10-24 13:16 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-22 20:01 RFC1323. No timestamping if SYN timestamp = 0. Bug or Feature? Bartek Wydrowski
2003-10-23 8:37 ` David S. Miller
2003-10-24 13:16 ` Casey Carter [this message]
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