> On Sep 18, 2015, at 14:16, George Michaelson <g...@algebras.org> wrote: > > My private comment bears repeating in public. > > DOMAIN names is about the property of domains. Domains are encompassing, > set-theory/venn-diagram style. A domain and a prefix are analogous concepts. > One is expressed syntactically somehow, the other is a mathematical property > of bounding in a number field but they have the same basic behaviour. > > the UK domain order in coloured book mails obeyed this property: it just used > reverse semantics to the ARPA model. > > XXXXXXXX.onion is *not* a domain name inside the .onion part: as I understand > it, the value is a hash, or other function which has no nesting properties > expressed syntactically.
Hi, my name's Alec, I work for Facebook and lead the engineering team for Facebook over Tor. You are certainly correct that the label immediately left of ".onion" is a hash, and functions not unlike a layer-3 address; however, there may be other labels leftwards of the hash, under (to some extent) other administrative control. The canonical example of this would be: www.facebookcorewwwi.onion <http://www.facebookcorewwwi.onion/> versus m.facebookcorewwwwi.onion versus… well, anything.you.like.sixteencharshash.onion. With onion addressing it's all a matter of whether the layer 7 protocol honours the symbolic name that it has been given (eg: www.facebookcorewwwi.onion <http://www.facebookcorewwwi.onion/>) and passes it to the server via metadata (eg: HTTP "Host:" header) rather than a delegated and differentiated address lookup. I feel this may need clarification in your section on Tor addressing. Perhaps it's not **really** domain-naming, but it **looks** much more like it. Also, there is some information which requires correction: According to an email message, ".onion" names may (in the future) exceed the length limits of a label imposed on DNS domain names, reaching 64, 80, or more bytes. [DNSOP1] Per this e-mail: https://www.ietf.org/mail-archive/web/ietf/current/msg94362.html <https://www.ietf.org/mail-archive/web/ietf/current/msg94362.html> ...from Nick Mathewson at Tor, he says: So it's IMO fine to say ".onion addresses are case-insensitive and will comply with existing DNS limitations for label lengths (63) and maximum fqdn lengths (253ish)". Which contradicts draft-lewis-domain-names-00 Also, my name's not "Alex" :-) - alec
signature.asc
Description: Message signed with OpenPGP using GPGMail
_______________________________________________ DNSOP mailing list DNSOP@ietf.org https://www.ietf.org/mailman/listinfo/dnsop
