[Asrg] DNSxL notation for IPv6?

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Hello Asrg List,

I asked this question over at SPAM-L, but I think the question may be of interest to asrg@ietf as well:

• --- cut --- Google was not helpful on this subject, so you may be able to help to reveal the status of DNSxL notation for IPv6.

What would make sense, and what not? What has already been tried?

I think it would make sense to use something similar to the reverse-dotted-quad notation used for IPv4, and use the same request/response types (DNS A/TXT records -- there are enough bits of information in a A response, no need for A6/AAAA).

Using the "full format" of IPv6 encoding (like [1]), replacing ":" by "." and reversing the whole thing would be the obvious notation, and most similar to the IPv4 notation -- however, it seems like a great waste of bandwidth to me.

Any better ideas?
- --- cut ---

On SPAM-L, the use of the PTR format was suggested:

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> windtunnel.rarpsl.com. 38400 IN AAAA fe80::203:93ff:fe96:296c
> c.6.9.2.6.9.e.f.f.f.3.9.3.0.2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.e.f.ip6.arpa.
> 38400 IN PTR windtunnel.rarpsl.com.

Besides the bandwidth argument (is this a valid argument?) against using the "full PTR" format, I have a different thought:

Since Anti-Spam tools will need to be upgrade one way or the other anyway, it may make sense to include a quasi standard for lookups for larger (and non-octet-boundary) ranges.

• -- Matthias

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