Re: rfc4941bis: Change to Valid Lifetime of temporary addresses

Fernando Gont <fgont@si6networks.com> Mon, 10 February 2020 15:52 UTC

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Subject: Re: rfc4941bis: Change to Valid Lifetime of temporary addresses
To: Gyan Mishra <hayabusagsm@gmail.com>
Cc: "6man@ietf.org" <6man@ietf.org>
References: <9cb65947-f634-e250-bfdc-134cfa2c91e9@si6networks.com> <CABNhwV2CGDCMiKMguk1D-TAk2WDentAY6eo86scgejjkHMOJKQ@mail.gmail.com> <650ce9e8-1a61-df46-f9cc-174af99d7142@si6networks.com> <CABNhwV3sJ2U+En2f0bzG4+izQCuR8PxQt7s9kExSYZR5B6MAcg@mail.gmail.com>
From: Fernando Gont <fgont@si6networks.com>
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Date: Mon, 10 Feb 2020 12:36:24 -0300
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On 10/2/20 11:58, Gyan Mishra wrote:
> 
> 
> On Mon, Feb 10, 2020 at 4:14 AM Fernando Gont <fgont@si6networks.com
> <mailto:fgont@si6networks.com>> wrote:
> 
>     On 10/2/20 01:44, Gyan Mishra wrote:
>     [....]
>     >     Comments? Objections?
>     >
>     >    Since we are proposing change of valid lifetime from 2 to 1 why not
>     > make the valid lifetime 1 day as well - same as the preferred.
> 
>     That's bad. That would mean that a connection that is started T seconds
>     before the address becomes invalid could only have a maximum lifetime of
>     T seconds.
> 
>     Put another way, in the worst case scenario where a new connection is
>     initiated with an address that is just about to become unpreferred, the
>     maximum lifetime of the connection is ValidLifetime - PreferredLifetime.
> 
> 
>     Walk me through it as far as end user impact when the address
> becomes unpreferred versus deprecated.
> 
>  So N = valid 1 day / preferred 1 day = 1 day 
> 
> As soon as the T time expires for preferred life it would become
> unpreferred but not deprecated.  

unpreferred == deprecated



> What is the difference from end user standpoint and impact in
> connectivity with the address becoming unpreferred versus deprecated?

Both are the same.



> With existing connections would still be able to use the deprecated
> addresses at time T at the preferred expire time or would their
> connection be reset and they would have to re-establish on the new
> preferred address?  
> 
> If existing connections get reset with 2 day valid lifetime at time T,
> then if seems no different then unpreferred which would get reset as well.

Please see RFC4861/RFC4862.

Thanks,
-- 
Fernando Gont
SI6 Networks
e-mail: fgont@si6networks.com
PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492