[dns-operations] Odd EDNS implementation bug
geoff at geoff.co.uk
Thu May 27 01:50:55 UTC 2010
Mark Andrews <marka at isc.org> wrote:
> In message <20100526232957.5B0C25406E at smtp.geoff.co.uk>, "Geoffrey Sisson" writ
> > marka at isc.org (Mark Andrews) wrote:
> > > In message <alpine.LSU.2.00.1005261924540.28459 at hermes-2.csi.cam.ac.uk>, To
> > ny Finch writes:
> > > > Some rr.com name servers put the answer RRset in the additional ssection
> > > > if you make an EDNS request:
> > > I suspect that it is a specialized server synthesizing responses
> > > on the fly and it hasn't been properly tested. You can't just
> > > append answers to queries and have it work.
> > Looking at this on the wire, it seems the OPT RR is in the answer section
> > and the answer is in the additional section, so it looks like they just
> > have the RRs in the wrong order.
> > Geoff
> If you play around with the edns buffer size you will see it change
> in the response to match that of the query.
Yup, that seems to confirm your suspicion that they're simply appending.
I thought they might just be serializing the RRs incorrectly.
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