RE: [dhcwg] dhcpv6-24: Temporary addresses
"Bernie Volz (EUD)" <Bernie.Volz@am1.ericsson.se> Wed, 15 May 2002 17:25 UTC
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From: "Bernie Volz (EUD)" <Bernie.Volz@am1.ericsson.se>
To: 'Ralph Droms' <rdroms@cisco.com>, dhcwg@ietf.org
Subject: RE: [dhcwg] dhcpv6-24: Temporary addresses
Date: Wed, 15 May 2002 12:24:38 -0500
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Ralph: I think all we wanted to do was to remove the prohibition against renewing IA_TA's. I don't think we want to drop the IA_TA concept or need to add T1/T2 times to the IA_TA option since the intent is NOT to renew these. If the client needs to continue using existing temporary addresses, it must initiate a Renew in time to renew them. The server can always have policy that would disallow this (for example if a renumbering event is happening). And, adding some comments that in a managed (stateful) addressing environment the RFC 3041 procedures basically trigger stateful requests for temporary addresses in place of the stateless autoconfiguration would be useful. - Bernie -----Original Message----- From: Ralph Droms [mailto:rdroms@cisco.com] Sent: Wednesday, May 15, 2002 1:11 PM To: dhcwg@ietf.org Subject: Re: [dhcwg] dhcpv6-24: Temporary addresses At 11:11 AM 5/8/2002 -0400, Thomas Narten wrote: > > A server MUST return the same set of temporary address for the same > > IA_TA (as identified by the IAID) as long as those addresses are > > still valid. After the lifetimes of the addresses in an IA_TA have > > expired, the IAID may be reused to identify a new IA_TA with new > > temporary addresses. > >I don't think the above is what we want. A Client should be able to >renew/extend lifetimes for temp addresses *if* they want. But in >general, they won't. (Note this is also allowed in 3041 in the sense >that this is left open as a possibility -- I don't see a need for DHC >to preclude this from being done) OK (but see below). >Ralph asked: > > > The basic question is "can a client ask and a server agree to extend > > the lifetimes on temp addresses". If lifetimes on temp addresses can > > be extended, how are they different from non-temp addresses? Good > > question to discuss in WG. > >They are different in that applications can specifically request that >temp addresses be used for communication, *or* that temp addresses NOT >be used. Thus, there has to be a way to distinguish between temp and >non-temp addresses. Also, I believe that a node might be using several >sets of temp addresses simultaneously. Normally, that would mean one >set that is "preferred", but there could be a number of others that >are "deprecated", meaning not to be used for new communication, but >still available to the applications that are already using them. If an >application is still using a temp address, it may need to extend the >valid Lifetime to prevent the address from going away. I agree that the protocol software needs to identify temporary addresses so that applications can select for or against them. But, how does DHCP handle temporary and non-temp addresses differently? Is is just a tag that the server supplies and the protocol software interprets to identify temporary addresses or are there other differences? >This also raises a different point. There should be more text about >when to get a new set of temp addresses. I.e., one could point to 3041 >for guidance on when to get a new one and use similar rules. I.e., >unlike permanent addresses, the normal action when a temporary address >becomes deprecated is to request a new (i.e., different) one. The old >one still remains for a while, but is being phased out. In contrast, >for public/global addresses, the normal action is to renew the *same* >address and extend its preferred lifetime. > > > An identity association for temporary addresses option MUST NOT > > appear in a Renew or Rebind message. This option MAY appear in a > > Confirm message if the lifetimes on the temporary addresses in the > > associated IA have not expired. > >If the client wants to extend a binding (perhaps an application is >still using that address) it should not be prohibited by the >protocol from doing so. OK - we can reference RFC3041 for that guidance... >Thomas > >_______________________________________________ >dhcwg mailing list >dhcwg@ietf.org >https://www1.ietf.org/mailman/listinfo/dhcwg _______________________________________________ dhcwg mailing list dhcwg@ietf.org https://www1.ietf.org/mailman/listinfo/dhcwg
- [dhcwg] dhcpv6-24: Temporary addresses Thomas Narten
- RE: [dhcwg] dhcpv6-24: Temporary addresses Bernie Volz (EUD)
- RE: [dhcwg] dhcpv6-24: Temporary addresses Bernie Volz (EUD)
- Re: [dhcwg] dhcpv6-24: Temporary addresses Ralph Droms
- RE: [dhcwg] dhcpv6-24: Temporary addresses Bernie Volz (EUD)
- RE: [dhcwg] dhcpv6-24: Temporary addresses Bound, Jim
- [dhcwg] dhcpv6-24: Temporary addresses Ralph Droms