Re: [v6ops] A broken promise - "You said PD Prefix Valid Lifetime is going to be X" (Re: SLAAC renum: Problem Statement & Operational workarounds)

"Bernie Volz (volz)" <volz@cisco.com> Fri, 01 November 2019 13:27 UTC

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From: "Bernie Volz (volz)" <volz@cisco.com>
To: Ted Lemon <mellon@fugue.com>
CC: Ole Troan <otroan@employees.org>, "v6ops@ietf.org" <v6ops@ietf.org>
Thread-Topic: [v6ops] A broken promise - "You said PD Prefix Valid Lifetime is going to be X" (Re: SLAAC renum: Problem Statement & Operational workarounds)
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Date: Fri, 1 Nov 2019 13:27:49 +0000
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Subject: Re: [v6ops] A broken promise - "You said PD Prefix Valid Lifetime is going to be X" (Re: SLAAC renum: Problem Statement & Operational workarounds)
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Both (until the old has expired).

There might be a condition that on a Solicit we may not send the expiring one after the preferred lifetime has elapsed – but it was a while ago that this was implemented and need to check the details. If I recall correctly, I think was done because in the early days of DHCPv6 there were clients that would not handle multiple IAPREFIXes properly – for example, they would only use the first or fail. And, if done, that might hamper removal of the old prefix in devices behind the CPE as the CPE would not learn of this prefix on a power cycle.


  *   Bernie

From: Ted Lemon <mellon@fugue.com>
Date: Friday, November 1, 2019 at 9:18 AM
To: Bernie Volz <volz@cisco.com>
Cc: Ole Troan <otroan@employees.org>rg>, "v6ops@ietf.org" <v6ops@ietf.org>
Subject: Re: [v6ops] A broken promise - "You said PD Prefix Valid Lifetime is going to be X" (Re: SLAAC renum: Problem Statement & Operational workarounds)

On Nov 1, 2019, at 9:09 AM, Bernie Volz (volz) <volz@cisco.com<mailto:volz@cisco.com>> wrote:
That’s not true. The server I work on allows you to specify an expiration time for a prefix, and we will automatically decrease lifetimes to honor that time and also stop using the prefix for new leases. This allows you to introduce a new prefix to be used for prefix delegation for graceful renumbering. Once the expiration time has passed, you can remove the old prefix as there should no longer be any active leases. We introduced this with the first release with DHCPv6 support a long time ago.

Does it send both prefixes to the CPE, or just the new one?