Re: rfc4941bis: Invalid addresses used by ongoing sessions

I think I prefer #1, #2 is acceptable, and #3 is a bad idea, I think this
issue needs discussion in the document.

Thanks.

On Mon, Feb 10, 2020 at 10:12 AM Fernando Gont <fgont@si6networks.com>
wrote:

> Folks,
>
> As currently specified, temporary addresses are removed when they become
> invalid (i.e., the Valid Lifetime expires).
>
> Section 6 ("6.  Future Work") of the draft
> (https://tools.ietf.org/id/draft-ietf-6man-rfc4941bis-06.txt) still
> keeps the following text from RFC4941.
>
> 6.  Future Work
>
>    An implementation might want to keep track of which addresses are
>    being used by upper layers so as to be able to remove a deprecated
>    temporary address from internal data structures once no upper layer
>    protocols are using it (but not before).  This is in contrast to
>    current approaches where addresses are removed from an interface when
>    they become invalid [RFC4862], independent of whether or not upper
>    layer protocols are still using them.  For TCP connections, such
>    information is available in control blocks.  For UDP-based
>    applications, it may be the case that only the applications have
>    knowledge about what addresses are actually in use.  Consequently, an
>    implementation generally will need to use heuristics in deciding when
>    an address is no longer in use.
>
>
> I wonder if this text should be:
>
> 1) moved more into the body of the document and made a "MAY" (which for
> TCP is very straightforward),
>
> 2) Be left "as is", or,
>
> 3) Removed from the document
>
>
> The implications of #1 above is that it can't prevent long-lived
> connections that employ temporary addresses from being torn down, at the
> expense of possibly increasing the number of concurrent IPv6 addresses.
>
> Thoughts?
>
> Thanks!
>
> Cheers,
> --
> Fernando Gont
> SI6 Networks
> e-mail: fgont@si6networks.com
> PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492
>
>
>
>
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