Middleboxes and EDNS(0)

Paul Hoffman <[email protected]> Sun, 14 Dec 2014 14:30:26 -0800

Newsgroups	gmane.ietf.dnsext
Message-ID	<[email protected]>

Greetings again. Section 6.1.1.1 of RFC 6891 says:

   OPT RRs MUST NOT be cached,
   forwarded, or stored in or loaded from master files.

Section 6.2.6 says:

   Middleboxes that simply forward requests to a recursive resolver MUST
   NOT modify and MUST NOT delete the OPT record contents in either
   direction.

If I'm a middlebox that is acting as a DNS forwarder, and I see an OPT RR on a query coming in my left side, what do I send that OPT RR out the right side? Do I follow the first or the second quote?

--Paul Hoffman
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