Re: [DNSOP] New Version Notification for draft-gersch-dnsop-revdns-cidr-02.txt
Ray Bellis <Ray.Bellis@nominet.org.uk> Wed, 09 May 2012 15:31 UTC
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From: Ray Bellis <Ray.Bellis@nominet.org.uk>
To: Joe Gersch <joe.gersch@secure64.com>
Thread-Topic: [DNSOP] New Version Notification for draft-gersch-dnsop-revdns-cidr-02.txt
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Date: Wed, 09 May 2012 15:31:41 +0000
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Subject: Re: [DNSOP] New Version Notification for draft-gersch-dnsop-revdns-cidr-02.txt
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Joe, The draft says: "The challenge is to preserve this alignment even when even when CIDR prefixes do not fall on octet boundaries. For example, 129.82.128.0/19 is a subprefix of 129.82.128.0/18. The DNS name for 129.82.128.0/19 should be logically below the DNS name for 129.82.128.0/18. This document introduces a naming convention for CIDR prefixes that preserves this alignment" Whilst you've made some changes in -02 relating to the octet boundaries, as far as I can see this assertion is still not true. The draft shows 129.82/16 mapping to m.82.129.in-addr.arpa, and 129.82.64/18 mapping to 1.0.m.82.129.in-addr.arpa, so that's OK. However 129/8 would map to m.129.in-addr.arpa, but m.82.129.in-addr.arpa (129.82/16) is _not_ a subdomain of that, even though it is a sub-prefix of the /8. It seems to be that your scheme works when considering prefixes which are split _within_ an octet, but does not work when considering splits _across_ an octet boundary. Or have I misunderstood? kind regards, Ray