I thought IXFR was abandoned because it was too expensive. Or
perhaps that support was pretty poor. AXFR is obviously out of the
question.
Does anyone know if any DNS software other than BIND supports IXFR?
Supported or not, it's not very clever, just ships a list of NS
records to delete and a list to add, relative to the version of the
zone that the client says it has. The server has to have (or be
prepared to generate) the diffs from all the stale versions of the
zone that a client might ask for.
If we know that a file is a list of IP addresses or a list of prefixes
and lengths, we can presumably design an efficient representation of
the differences. I'm more interested in how we'd distribute it. For
example, the oft-cited ClamAV distributes via a very large network of
HTTP mirrors. That's not awful, but I wouldn't want to have to come
up with such a network for every BL in the world.
It seems to me that there's always going to be a point below which
it's better to query for individual answers, and above which it's
better to maintain a mirror, so whatever we do we should be prepared
for both. I also think that it wouldn't be hard to come up with
something that caches a lot better than current BLs, which would move
the query/mirror line up considerably.
R's,
John
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