Re: [DNSOP] Variant bad idea of the day
"John R Levine" <johnl@taugh.com> Wed, 02 January 2019 19:48 UTC
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Date: Wed, 02 Jan 2019 14:48:49 -0500
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From: John R Levine <johnl@taugh.com>
To: Brian Dickson <brian.peter.dickson@gmail.com>
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Subject: Re: [DNSOP] Variant bad idea of the day
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On Wed, 2 Jan 2019, Brian Dickson wrote: >> Let's assume for the purposes of argument that we have a DNS server that >> knows how to translate between A-labels an U-labels. Then I invent this >> DNS record > > Is it the case that you have a bunch of labels that you want to have > treated as equivalent, and that at the terminus of any given FQDN involving > a sequence of equivalence-sets of labels, there is a single "canonical" > owner name for all the RRtypes/RRsets? Basically yes, it's the IDN version of ASCII upper/lower case equivalence. If you have a label ABCD in your zone, it'll match abcd and Abcd and 14 other upper-lower combinations. > This is to use DNAMEs for all of the variants, with all names being > letter-digit-hyphen format (a-label?), so for i18n stuff, xn--* format. Unfortunately this is a WKBI for multiple reasons: * DNAME only maps names below it, not the name itself. This is why this approach completely failed in the .CAT TLD to try and map accented to unaccented names. * DNAME only maps one name at a time, but a name can have many variants and there can be variants at every level, e.g., if a name is FOO.BAR, there's 8 possible variants for each label. * DNAME synthesized names are not equivalent to the original, particularly for mail since MX to CNAME is not allowed and the rule is spottily followed. Taiwan has a DNAME to map the simplified .台湾 to .台灣. It sort of works. $ dig xn--kprw13d. dname ;; ANSWER SECTION: xn--kprw13d. 3600 IN DNAME xn--kpry57d. > This is to use authority-size zone file references, and pull in identical > zone files by reference, rather than keep the parallel zones as separately > maintained entities. That's not exactly a WKBI, but it only solves a small part of the problem. You can use it to map equivalent zones line foo.ngo and foo.ong, but it doesn't handle variant names within the zone. I use it in my DNS toaster for a user who has a lot of vanity zones and want them all to point to the same place. Regards, John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY Please consider the environment before reading this e-mail. https://jl.ly
- [DNSOP] Variant bad idea of the day John R Levine
- Re: [DNSOP] Variant bad idea of the day Patrik Fältström
- Re: [DNSOP] Variant bad idea of the day John R Levine
- Re: [DNSOP] Variant bad idea of the day Patrik Fältström
- Re: [DNSOP] Variant bad idea of the day John R Levine
- Re: [DNSOP] Variant bad idea of the day Brian Dickson
- Re: [DNSOP] Variant bad idea of the day John R Levine