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Re: [tcpm] Disabling PAWS when possible

Yoshifumi Nishida <nishida@sfc.wide.ad.jp> Fri, 22 June 2018 23:19 UTC

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From: Yoshifumi Nishida <nishida@sfc.wide.ad.jp>
Date: Fri, 22 Jun 2018 16:18:58 -0700
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To: Fernando Gont <fgont@si6networks.com>
Cc: Yoshifumi Nishida <nishida@sfc.wide.ad.jp>, "tcpm@ietf.org" <tcpm@ietf.org>
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Subject: Re: [tcpm] Disabling PAWS when possible
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Hi Fernando,

On Fri, Jun 22, 2018 at 8:26 AM, Fernando Gont <fgont@si6networks.com>
wrote:

> On 06/21/2018 09:49 AM, Yoshifumi Nishida wrote:
> > Hello,
> >
> > I have been thinking about PAWS and TS option for a while and prepared a
> > simple short draft.
> > The basic ideas in the draft are like this.
> >
> > 1: There are several technologies (such as tcpinc, mptcp, tls) that can
> > be used as a replacement of PAWS
> >     They can even provide stronger protections than PAWS, which might be
> > able to contribute to recycling connections in TIME_WAIT.
>
> Not sure if I understood correctly, but you may be able to recycle
> connections in the TIME-WAIT state if the initial timestamps are
> monotonically-increasing.
>
> Yes, you're right as long as initial timestamps are monotonically
increasing.
But, I think this is not true on some implementations (e.g.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=95a22caee396cef0bb2ca8fafdd82966a49367bb
)
I think it would be better if we can have other ways than PAWS to support
this kind of situations.
--
Yoshi

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