Re: [Pals] [Int-area] L2TP sequencing: Commonly disabled for IP data? Or always?

Bob Briscoe <ietf@bobbriscoe.net> Mon, 28 June 2021 08:39 UTC

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To: James Bensley <jwbensley+pals@gmail.com>, pals@ietf.org, intarea IETF list <int-area@ietf.org>
References: <5c60cc79-1552-3f52-641f-e508780227ae@bobbriscoe.net> <YLuFLq7k9akVVHWS@clarinet.employees.org> <CAA=duU2o9YKF5Sfu6VTr5+bUr1JVgaGZh=X4+BQRbMu63FqVsg@mail.gmail.com> <5E252602-F635-4DF0-8FAE-C80CF88293D9@gmail.com> <YMCj2P4AlqlpeXdV@clarinet.employees.org> <EC1A1D29-EF8D-4480-A950-3BA2AD16033F@gmail.com> <881FF4F8-27BA-4B58-B54E-68F3811BE1D4@layerfree.net> <CAAWx_pWZt1RTHeCvghfNFyEB7E-6zDC89uexbDEdo=9=uVLcBA@mail.gmail.com> <YMDIrkR/ekhMZi2K@clarinet.employees.org> <CAAWx_pXPK7YfrcBZWk=hHRy+YqMbtq=bKfpa0iQBu4fX7iLekw@mail.gmail.com> <3421c34d-0fba-df94-89a3-64abdc325633@bobbriscoe.net> <CAAWx_pXnoZ6-LhZeTiZ8=eG+7JKRd9WV_Y8QxHZ_g6jB3qFqFg@mail.gmail.com>
From: Bob Briscoe <ietf@bobbriscoe.net>
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Date: Mon, 28 Jun 2021 09:39:34 +0100
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Subject: Re: [Pals] [Int-area] L2TP sequencing: Commonly disabled for IP data? Or always?
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James,

On 28/06/2021 09:17, James Bensley wrote:
> On Sun, 27 Jun 2021 at 23:22, Bob Briscoe <ietf@bobbriscoe.net> wrote:
>> James,
>>
>> [First apologies to everyone for asking the question then not following
>> up on the answers until now - I went off line for a while.]
>> See inline tagged [BB]...
>
>>> [JB] In that case  - sequencing isn't used for BT Wholesale services.
>> [BB] Thank you. It sounds like you have some reason for your certainty
>> here. Can you elaborate on what makes you so certain sequencing isn't used?
> Hi Bob,
>
> Sure, my current employer is a BTW customer and I have checked our
> live/current set-up and L2TP sequencing is disabled. I also worked for
>   different UK operator previously that was also a BTW customer. I've
> checked the old configs and outputs from when I was there, and again
> L2TP sequencing was disabled (I'm in close contact with those former
> colleagues they confirm it is still disabled). I've asked a few
> friends at other UK operators, and none of them have L2TP sequencing
> enabled on their BTW tunnels. I've also scanned the BTW docs and can't
> find anything that mentions it is supported.

[BB] Thx for looking into this in such depth.

My attempt to generalize this UK-specific knowledge: No-one is going to 
add sequencing without a reason, and the only possible reason mentioned 
so far would be stateful compression, which these days would just slow 
things down more than the bandwidth saved.

Cheers

Bob

>
> Cheers,
> James.

-- 
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/