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RE: graceful renumbering of CPE networks

"Bernie Volz (volz)" <volz@cisco.com> Mon, 25 February 2019 14:48 UTC

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From: "Bernie Volz (volz)" <volz@cisco.com>
To: Sander Steffann <sander@steffann.nl>, Ole Troan <otroan@employees.org>
CC: Michael Richardson <mcr+ietf@sandelman.ca>, 6man WG <ipv6@ietf.org>
Subject: RE: graceful renumbering of CPE networks
Thread-Topic: graceful renumbering of CPE networks
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Date: Mon, 25 Feb 2019 14:48:15 +0000
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References: <60fabe4b-fd76-4b35-08d3-09adce43dd71@si6networks.com> <e3e0bf2273e04f15b792665d0f66dfe5@boeing.com> <4c5fab33-2bff-e5b5-fc1d-8f60a01a146d@go6.si> <b4525832-9151-20bf-7136-31d87ba6c88d@huitema.net> <463f15cf-2754-e2e8-609d-dc0f33448c6c@go6.si> <ff649810-7242-7bc2-d36f-3f998f7bdd71@asgard.org> <9CDF41CA-83B4-4FC4-B995-EF79727C5458@steffann.nl> <CAO42Z2wA+vLmU7+sU6xLK7TO6pWfNQA5shs9zp=PqANCihLmBQ@mail.gmail.com> <BAB3061A-1808-4C0E-AA1B-2D7DD5BA63FC@employees.org> <bbd8b761-403a-5b3f-3f04-dc3bfdea116e@foobar.org> <6F3036C6-50A1-43C6-B554-31293B69E59D@employees.org> <433607c1-dbc6-a42e-cb17-dc209e33bdaa@si6networks.com> <12EA4FAE-BE3D-4CFE-9837-DF052F79A998@employees.org> <F48A816A-983E-4375-834C-75F103DCEA6A@employees.org> <8c8a79cf-0a87-15bc-bd91-bd2da82fdfa1@si6networks.com> <9BE77D1D-C247-4B8E-B9A F-22BE1DC9F79D@employees.org> <CAKD1Yr1fv3pUevB_zeZpQ-UQcNUo2zHUH4xj9NXYohyMbUSgRQ@mail.gmail.com> <25657.1550676340@localhost> <716de09a-2436-f0c7-c607-bdfef35880b1@gmail.com> <7014.1551050774@localhost> <90DA6A7F-783B-4548-861F-21DACF780D81@employees.org> <421AFE1B-EA85-44E3-AD89-75D1B51911AA@steffann.nl>
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Per CM-SP-eRouter-I13-140729.pdf, at least for CableLabs, this seems to be required:

The eRouter sends a DHCPv6 Solicit message as described in section 17.1.1 of [RFC 3315]. The Solicit message
MUST include:
1. A Client Identifier option containing the DHCP Unique Identifier (DUID) for this eRouter (as specified by
[RFC 3315]), the DUID should be formatted as follows:
a. The eRouter MUST use a DUID that is one of DUID-LL, DUID-EN or DUID-LLT type and;
b. The eRouter MUST use a DUID that is persistent across administrative reset or reboot following a loss of
power per [RFC 7084] W-6.
2. An IA_NA option to obtain its IPv6 address.
3. An IA_PD option (as specified in [RFC 3633]) to obtain its delegated IPv6 prefix.
4. A Reconfigure Accept option to indicate the eRouter is willing to accept Reconfigure messages.
...

- Bernie

-----Original Message-----
From: ipv6 <ipv6-bounces@ietf.org> On Behalf Of Sander Steffann
Sent: Monday, February 25, 2019 9:00 AM
To: Ole Troan <otroan@employees.org>
Cc: Michael Richardson <mcr+ietf@sandelman.ca>; 6man WG <ipv6@ietf.org>
Subject: Re: graceful renumbering of CPE networks

Hi,

>> The part that is missing is some kind of "push" notification from the 
>> ISP to the CPE that new addresses are available.  That need not 
>> obsolete the old addresses --- the lifetime contract can be maintained.
> 
> DHCP Reconfigure.

+1

I often hear the argument that it isn't widely implemented, which seems sadly true. But then inventing something else (that then has to be implemented) seems extremely silly.

Cheers,
Sander

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