Re: Fwd: New Version Notification for draft-wouters-edns-tcp-chain-query-01.txt (fwd)

Tony Finch <[email protected]> wrote:

Sorry, there was an error in my calculations.

> A lot of these are NODATA responses, the 2nd to 6th queries inclusive.
> These responses are entirely redundant, since the RRSIG in the A response
> indicates there is no AAAA and the nearest enclosing zone cut is cam.ac.uk
> below which there are no DNSKEY nor DS records. Leaving those out would
> save 2349 bytes, for a total of 4219 bytes of reply.

The RRSIG only proves the nonexistence of the DNSKEY and DS records. We
need the NSEC to prove the nonexistence of the AAAA record. And the A and
AAAA queries have to be separate, so the AAAA response should be a full
NODATA response. So we only save 1872 bytes and the total is 4694 bytes.

> The remaining redundancy that edns-chain-query would eliminate is the
> repetetive headers and OPT RRs. I think (without having checked in detail)
> that this saves from the response the same amount of data as all but two
> of the queries. (The first two queries still need to be separate; the
> client would send one with the chain option and one without.) This saves
> another 430 bytes, reducing the total to 3789 bytes.

Actually 4264 which is 55% of the original.

Tony.
-- 
f.anthony.n.finch  <[email protected]>  http://dotat.at/
Forties, Cromarty: East, veering southeast, 4 or 5, occasionally 6 at first.
Rough, becoming slight or moderate. Showers, rain at first. Moderate or good,
occasionally poor at first.
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