> -----Original Message----- > From: Pekka Savola [mailto:[email protected]] > Sent: Wednesday, January 06, 2010 10:31 PM > To: Juergen Schoenwaelder > Cc: Dan Wing; > [email protected]; > 'IETF IPv6 Mailing List' > Subject: Re: AD review of draft-ietf-6man-text-addr-representation > > On Wed, 6 Jan 2010, Juergen Schoenwaelder wrote: > >> 1) Mandate that the text representation is <SOMETHING> > >> and never changes after this. > >> > >> 2) Mandate that the text representation is <SOMETHING> > >> but take into account new WKPs. > >> > >> 3) Mandate that the text representation is <SOMETHING> > >> but require that external mechanisms help recognize > >> even dynamically assigned IPv4/IPv6 prefixes. > >> > >> 4) As above, but specify a mandatory external mechanism. > > > > My main interest is textual comparability of addresses coming from > > potentially many different sources. If I can compare > addresses safely > > only if I know some context information communicated out of > band or I > > have to configure all sources to produce the same, I feel somewhat > > uneasy. My preference thus is 1), I might be OK with 2) if the > > frequency of the introduction of new WKPs is very small. > > While I like to see v4 address in a readable form when its used that > way, I have to say I agree with Jürgen's concerns, especially if the > algorithm was applied to opertor-specific prefixes as well (the tool > would have to have this OOB intelligence). > > However, in some cases I'm not sure if comparison equality is really > such a big deal. I don't think there's a way to satisfy both > "embedded v4 readability" and "absolute comparability" so a tradeoff > must be made. > > So, I'd actually suggest that we go for 1) or 2) but soften that a > bit, like: "if it is known by some external method that the prefix > includes an IPv4 address, the representation MAY print it in dotted > decimal". With "external method" I'm thinking of either a > command-line > argument or application's own logic; I don't see how you could get > that information "dynamically" so that it would be available to > applications (for example, I don't see apps like that using DHCP > information..).
Works for me. -d > -- > Pekka Savola "You each name yourselves king, yet the > Netcore Oy kingdom bleeds." > Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings -------------------------------------------------------------------- IETF IPv6 working group mailing list [email protected] Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
