Re: EDNS exchanges in draft-wouters-edns-tcp-chain-query-00.txt

In message <53F00E5CD8B2E34C81C0C89EB0B4FE7368551C8A@wds-exc2.okna.nominet.org.
uk>, Ray Bellis writes:
> 
> On 31 Oct 2013, at 13:03, Olaf Kolkman <[email protected]> wrote:
> 
> > I am not sure if there are clients out there that get all nauseous from OPT
> >  RRs in the responses 
> 
> There are bound to be - I've certainly seen CPE that get nauseous (FORMERR)
> with OPT RRs in the request, and I've no reason to believe they wouldn't do
> just the same for an unsolicited OPT RR in the response.

And such CPE are not RFC 103[45] compliant as the server can put
anything it wants into a additional section of a query response
that it believes will be useful to the client.

e.g.
     NAPTR -> SRV records in the additional section -> A + AAAA in the
additional section.

Having a OPT record in a request is different as the additional
section was expected to be empty in RFC 103[45] query requests.

You can't draw conclusions on how a response will be treated based
on how a query is treated.

Mark
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: [email protected]
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