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

Giles Heron <giles@layerfree.net> Wed, 09 June 2021 12:05 UTC

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From: Giles Heron <giles@layerfree.net>
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Date: Wed, 09 Jun 2021 13:05:03 +0100
Cc: Derek Fawcus <dfawcus+lists-int-area@employees.org>, "Carlos Pignataro (cpignata)" <cpignata@cisco.com>, Ignacio Goyret <ignacio.goyret@nokia.com>, intarea IETF list <int-area@ietf.org>, "Andrew G. Malis" <agmalis@gmail.com>, mark@townsley.net, pals@ietf.org
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Subject: Re: [Pals] [Int-area] L2TP sequencing: Commonly disabled for IP data? Or always?
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Hi Stewart,

IIRC (and it *was* a long time ago), ADSL is BT Wholesale rather than OpenReach.

But at any rate yes, L2TP (v2 rather than v3) does tend to get used for wholesale ADSL provision (where that still exists).   There has been some move generally to PTA (PPP Termination and Aggregation) into VRFs but that depends on the wholesale provider’s offering.

Re BT specifically (and again my info is outdated and may be mis-remembered) the 20C network used L2TP, and I think it’s an option on 21C for handoff to smaller ISPs.  Should all be in the SINs somewhere?

Giles

> On 9 Jun 2021, at 12:48, Stewart Bryant <stewart.bryant@gmail.com> wrote:
> 
> 
> 
>> On 9 Jun 2021, at 12:19, Derek Fawcus <dfawcus+lists-int-area@employees.org> wrote:
>> 
>> On Wed, Jun 09, 2021 at 11:23:00AM +0100, Stewart Bryant wrote:
>>> 
>>> I doubt that there is much L2TP still out there. It was in its prime with dialup modems.
>> 
>> Stewart,
>> 
>> Isn't the BT wholesale ADSL product still using it?
>> 
>> Someone recently pointed to their SIN 472, which reference RFC 2661 not 3931.
>> I don't know what other countries are doing for ADSL service,
>> and in how many ADSL is a live vs legacy product.
>> 
>> Certainly my ISP describes how one can connect to them using L2TP mainly because
>> they have the backend available for supporting the various 'broadband' access
>> facilities.  They also offer ADSL access via another provider, so maybe they're
>> also using L2TP?
>> 
>> So maybe the UK deployment doesn't count a 'much’.
>> 
>> DF
> 
> I suppose the ADSL product may be using it. I thought that it was all MPLS-PW.
> 
> We need someone from Openreach to tell us what they are doing.
> 
> In any case hopefully the last of the xDSL will soon be confined to the scrap bin it should have been in years ago as part of the plan to replace copper with FTTP/5G/LEO.
> 
> - Stewart
> 
> 
> 
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