rfc4941bis: Change to Valid Lifetime of temporary addresses (take two)

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

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Subject: rfc4941bis: Change to Valid Lifetime of temporary addresses (take two)
From: Fernando Gont <fgont@si6networks.com>
To: "6man@ietf.org" <6man@ietf.org>
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Date: Mon, 10 Feb 2020 07:22:51 -0300
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Folks,

This is simply a reminder/request for input regarding this proposed change.

My understanding is that folks proposing this came from "if folks are
concerned, we could do this".

I would like to get more input comments on the topic from other
participants.

The change certainly would be fine. That said, in the context of
RFC7934, I'm curious if we could really be concerned about nodes using 7
concurrent addresses (in the worst case scenario). FWIW, such number of
ongoing active addresses would only be hit if all of the unpreferred
addresses are in use by ongoing long-lived connections. Again, the
change would be fine, but I'd like input regarding whether it's really
warranted.

Thoughts?

Thanks!

Cheers,
Fernando




On 30/1/20 19:27, Fernando Gont wrote:
> Folks,
> 
> It has been suggested by Lorenzo Colitti, David Farmer, and others, to
> change the default Valid Lifetime of temporary addresses.
> 
> Namely, to change it from the current (RFC4941) "one week", to "two
> days". This indirectly limits the maximum number of temporary addresses
> employed by hosts. (2, compared to the current 11 (as per RFC4941)).
> 
> This requires these changes:
> 
> * Section 3.5:
> 
> OLD:
>    Because the precise frequency at which it is appropriate to generate
>    new addresses varies from one environment to another, implementations
>    SHOULD provide end users with the ability to change the frequency at
>    which addresses are regenerated.  The default value is given in
>    TEMP_PREFERRED_LIFETIME and is one day.  In addition, the exact time
>    at which to invalidate a temporary address depends on how
>    applications are used by end users.  Thus, the suggested default
>    value of one week (TEMP_VALID_LIFETIME) may not be appropriate in all
>    environments.  Implementations SHOULD provide end users with the
>    ability to override both of these default values.
> 
> NEW:
>    Because the precise frequency at which it is appropriate to generate
>    new addresses varies from one environment to another, implementations
>    SHOULD provide end users with the ability to change the frequency at
>    which addresses are regenerated.  The default value is given in
>    TEMP_PREFERRED_LIFETIME and is one day.  In addition, the exact time
>    at which to invalidate a temporary address depends on how
>    applications are used by end users.  Thus, the suggested default
>    value of two days (TEMP_VALID_LIFETIME) may not be appropriate in all
>    environments.  Implementations SHOULD provide end users with the
>    ability to override both of these default values.
> 
> 
> * Section 5:
> 
> OLD:
>    TEMP_VALID_LIFETIME -- Default value: 1 week.  Users should be able
>    to override the default value.
> 
> NEW:
>    TEMP_VALID_LIFETIME -- Default value: two days.  Users should be able
>    to override the default value.
> 
> 
> Comments? Objections?
> 
> Thanks!
> 
> Cheers,


-- 
Fernando Gont
SI6 Networks
e-mail: fgont@si6networks.com
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