Re: [Int-area] Continuing the addressing discussion: what is an address anyway?
Toerless Eckert <tte@cs.fau.de> Mon, 07 March 2022 12:39 UTC
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Date: Mon, 07 Mar 2022 13:39:39 +0100
From: Toerless Eckert <tte@cs.fau.de>
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
Cc: Dino Farinacci <farinacci@gmail.com>, "Int-area@ietf.org" <Int-area@ietf.org>, Dirk Trossen <dirk.trossen=40huawei.com@dmarc.ietf.org>
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References: <57c643c667d94a77b9917bb17dc142a5@huawei.com> <7de0956f-3fde-1543-405b-b635f6e69362@lear.ch> <Yh5M18z2/YVfpW7i@faui48e.informatik.uni-erlangen.de> <A771FFF8-43A8-4D84-8B6E-A3E7AF96644E@gmail.com> <YiBhOKIK9bMqwx0a@faui48e.informatik.uni-erlangen.de> <385CF477-C876-482F-ADFE-DAAD6CA7BAEC@gmail.com> <YiH6iHwv+U9QFA06@faui48e.informatik.uni-erlangen.de> <499a3364-7ea5-4268-cce3-43f010f36a72@gmail.com>
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Subject: Re: [Int-area] Continuing the addressing discussion: what is an address anyway?
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Thanks, Brian. Looks like a good reference. Alas a longer read ;-) Definitions seem to be agreeable. Except that "node" is overloaded across different RFCs. We used it instead of router/switch in ANIMA. I guess i would now use "logical entity" for what rfc6115 calls logical node. Cheers Toerless On Sat, Mar 05, 2022 at 08:57:36AM +1300, Brian E Carpenter wrote: > Toerless, > > I believe the closest we ever got to agreed definitions was in the > IRTF RFC 6115: > > 6. A "locator" is a structured topology-dependent name that is not > used for node identification and is not a path. Two related > meanings are current, depending on the class of things being > named: > > 1. The topology-dependent name of a node's interface. > > 2. The topology-dependent name of a single subnetwork OR > topology-dependent name of a group of related subnetworks > that share a single aggregate. An IP routing prefix is a > current example of the latter. > > 7. An "identifier" is a topology-independent name for a logical > node. Depending upon instantiation, a "logical node" might be a > single physical device, a cluster of devices acting as a single > node, or a single virtual partition of a single physical device. > An OSI End System Identifier (ESID) is an example of an > identifier. A Fully Qualified Domain Name (FQDN) that precisely > names one logical node is another example. (Note well that not > all FQDNs meet this definition.) > > Regards > Brian > > On 05-Mar-22 00:39, Toerless Eckert wrote: > > On Thu, Mar 03, 2022 at 09:28:23AM -0800, Dino Farinacci wrote: > > > > of its address structure helps the underlay to locate the entity (xTR) that the > > > > address is assigned to (xTR). So the name 'locator' is 'just' a good > > > > name for what LISP calls/uses the address for, not for how the under > > > > itself would maybe call the address or use the address for. > > > > > > Well the locator you put in an outer header destination address is called/used/assign to whatever the rules of the underlay are. If the underlay is ethernet, then its a 6-byte address where the high-order 3 bytes is an organizational ID, just to cite an example. > > > > Indeed. > > > > I have not seen an answer to the question i posed earlier in the thread: > > whether and if so what general (not technology specific) definition of locator > > and identifier the IETF may have. But i have seen a lot of confusion about > > it and people shying away from using these terms. > > > > If (as i think) we do not have a commonly applicable definition of locator/identifier > > (beyond its use in indivdual technologies like LISP), then i think this is because > > folks who tried to apply these terms (incorrectly) may have failed to > > see the difference between what an address is and what someone (like an > > application) calls it (/uses it for). In that respect the reference to > > the White Knight in IEN19 is very helpful to remember. > > > > Cheers > > Toerless > > > > > Dino > > -- --- tte@cs.fau.de
- [Int-area] Continuing the addressing discussion: … Dirk Trossen
- Re: [Int-area] Continuing the addressing discussi… Eliot Lear
- Re: [Int-area] Continuing the addressing discussi… Geoff Huston
- Re: [Int-area] Continuing the addressing discussi… Tom Herbert
- Re: [Int-area] Continuing the addressing discussi… Stewart Bryant
- Re: [Int-area] Continuing the addressing discussi… Geoff Huston
- Re: [Int-area] Continuing the addressing discussi… Geoff Huston
- Re: [Int-area] Continuing the addressing discussi… Brian E Carpenter
- Re: [Int-area] Continuing the addressing discussi… Dino Farinacci
- Re: [Int-area] Continuing the addressing discussi… Tom Herbert
- Re: [Int-area] Continuing the addressing discussi… Eliot Lear
- Re: [Int-area] Continuing the addressing discussi… Dirk Trossen
- Re: [Int-area] Continuing the addressing discussi… Dirk Trossen
- Re: [Int-area] Continuing the addressing discussi… Antoine FRESSANCOURT
- Re: [Int-area] [Coin] Fwd: [arch-d] Continuing th… Adrian Farrel
- Re: [Int-area] Continuing the addressing discussi… Geoff Huston
- Re: [Int-area] Continuing the addressing discussi… Dirk Trossen
- Re: [Int-area] [arch-d] Continuing the addressing… Luigi Iannone
- Re: [Int-area] Continuing the addressing discussi… Alexandre Petrescu
- Re: [Int-area] Continuing the addressing discussi… Toerless Eckert
- Re: [Int-area] Continuing the addressing discussi… Toerless Eckert
- Re: [Int-area] Continuing the addressing discussi… Dino Farinacci
- Re: [Int-area] Continuing the addressing discussi… Toerless Eckert
- Re: [Int-area] Continuing the addressing discussi… Dino Farinacci
- Re: [Int-area] Continuing the addressing discussi… Toerless Eckert
- Re: [Int-area] Meaning of Identifier, Locator, an… Joel M. Halpern
- Re: [Int-area] Continuing the addressing discussi… Brian E Carpenter
- Re: [Int-area] Meaning of Identifier, Locator, an… Toerless Eckert
- Re: [Int-area] Continuing the addressing discussi… Jens Finkhaeuser
- Re: [Int-area] Continuing the addressing discussi… Antoine FRESSANCOURT
- Re: [Int-area] Continuing the addressing discussi… Jens Finkhaeuser
- Re: [Int-area] Continuing the addressing discussi… Toerless Eckert
- Re: [Int-area] Continuing the addressing discussi… Toerless Eckert
- Re: [Int-area] Continuing the addressing discussi… Antoine FRESSANCOURT
- Re: [Int-area] Continuing the addressing discussi… Antoine FRESSANCOURT
- Re: [Int-area] Continuing the addressing discussi… Jens Finkhaeuser
- Re: [Int-area] Continuing the addressing discussi… Alan DeKok
- Re: [Int-area] Continuing the addressing discussi… Toerless Eckert
- Re: [Int-area] Continuing the addressing discussi… Antoine FRESSANCOURT
- Re: [Int-area] Continuing the addressing discussi… Dino Farinacci
- Re: [Int-area] Continuing the addressing discussi… Dino Farinacci
- Re: [Int-area] Continuing the addressing discussi… Dino Farinacci
- Re: [Int-area] Continuing the addressing discussi… Jens Finkhaeuser
- Re: [Int-area] Continuing the addressing discussi… Bless, Roland (TM)
- Re: [Int-area] Continuing the addressing discussi… Templin (US), Fred L
- Re: [Int-area] Continuing the addressing discussi… Dino Farinacci
- Re: [Int-area] Continuing the addressing discussi… Jens Finkhaeuser
- Re: [Int-area] Meaning of Identifier, Locator, an… Dino Farinacci