Re: rfc4941bis: Invalid addresses used by ongoing sessions
Fernando Gont <fgont@si6networks.com> Tue, 11 February 2020 05:16 UTC
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Subject: Re: rfc4941bis: Invalid addresses used by ongoing sessions
To: Mark Smith <markzzzsmith@gmail.com>, Gyan Mishra <hayabusagsm@gmail.com>
Cc: 6MAN <6man@ietf.org>
References: <c6ba9a00-cb44-2022-5009-34211966518c@si6networks.com> <CABNhwV0mb8dL_4Ef5UxAbcRbP18nH9Ztvx8XHJ0Z0GM-NaCwgw@mail.gmail.com> <CAO42Z2zB6gpKwZ=DfRVEbURNyKPJWAOqLqrFvW8T_uc59=9tiw@mail.gmail.com>
From: Fernando Gont <fgont@si6networks.com>
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Date: Tue, 11 Feb 2020 02:16:25 -0300
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On 10/2/20 23:25, Mark Smith wrote: > > > On Tue, 11 Feb 2020, 13:13 Gyan Mishra, <hayabusagsm@gmail.com > <mailto:hayabusagsm@gmail.com>> wrote: > > > > > On Mon, Feb 10, 2020 at 11:12 AM Fernando Gont > <fgont@si6networks.com <mailto: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. > > > Gyan> So for TCP apps it maybe easier to track via active TCB > blocks so those long lived connections could be tracked. So those > long lived TCP connections would not be impacted and torn down. > Other apps using UDP may not be as easily tracked and so maybe using > the deprecated address, however due to difficulty of tracking maybe > torn down as a side effect of option #1. > > > > Long lived connections using temporary addresses should not be a > consideration, because long lived connections should not be using > temporary addresses. > > "Temporary" and "long lived" (persistent, stable) are opposites that can > never be resolved. In that case, would you go for #2 above? And, what's your position regarding reducing the preferred and valid lifetimes? Thanks! -- Fernando Gont SI6 Networks e-mail: fgont@si6networks.com PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492
- rfc4941bis: Invalid addresses used by ongoing ses… Fernando Gont
- RE: rfc4941bis: Invalid addresses used by ongoing… Pascal Thubert (pthubert)
- Re: rfc4941bis: Invalid addresses used by ongoing… Fernando Gont
- Re: rfc4941bis: Invalid addresses used by ongoing… David Farmer
- Re: rfc4941bis: Invalid addresses used by ongoing… Mark Smith
- Re: rfc4941bis: Invalid addresses used by ongoing… Gyan Mishra
- Re: rfc4941bis: Invalid addresses used by ongoing… Gyan Mishra
- Re: rfc4941bis: Invalid addresses used by ongoing… Mark Smith
- Re: rfc4941bis: Invalid addresses used by ongoing… Tom Herbert
- Re: rfc4941bis: Invalid addresses used by ongoing… Fernando Gont
- Re: rfc4941bis: Invalid addresses used by ongoing… Fernando Gont
- Re: rfc4941bis: Invalid addresses used by ongoing… Fernando Gont
- Re: rfc4941bis: Invalid addresses used by ongoing… Gyan Mishra
- RE: rfc4941bis: Invalid addresses used by ongoing… Pascal Thubert (pthubert)
- Re: rfc4941bis: Invalid addresses used by ongoing… Mark Smith
- Re: rfc4941bis: Invalid addresses used by ongoing… Gyan Mishra
- Re: rfc4941bis: Invalid addresses used by ongoing… Fernando Gont
- Re: rfc4941bis: Invalid addresses used by ongoing… Tom Herbert