Re: rfc4941bis: Change to Valid Lifetime of temporary addresses

Fernando Gont <fgont@si6networks.com> Mon, 10 February 2020 09:14 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>
From: Fernando Gont <fgont@si6networks.com>
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Date: Mon, 10 Feb 2020 04:55:54 -0300
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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.



> When you increase the valid lifetime the user can see his previous stare
> of the address.  Most users would not be able to understand what is
> meant by preferred or deprecated address.  I am not sure what is gained
> from an end user standpoint whom most likely will not be network savvy.

I don't think anybody expects the user to understand this sort of thing.
It's folks all the way from us to app developers that should somehow
understand something. For users, things should just work.


> Also from a network standpoint the operator for enterprises as well as
> service providers save the ND cache for troubleshooting to fire devices
> historical data so even if the address changes every day the operator
> can determine all the address the host as used during the tracking cycle
> before the database rolls over which varies.  Operators have direct
> access to the network elements so the ND cache monitoring is at their
> fingertips. 

That depends on many factors.

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