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Re: [dnsext] WGLC: draft-ietf-dnsext-dnssec-bis-updates-16

Mark Andrews <marka@isc.org> Sat, 28 January 2012 05:20 UTC

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To: Mohan Parthasarathy <suruti94@gmail.com>
From: Mark Andrews <marka@isc.org>
References: <20120120054939.GD4365@mail.yitter.info> <CACU5sDnS-3V26yKyvTGObR67H2LPiBjWxCZAbMpHPZrgXJeNFg@mail.gmail.com>
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Date: Sat, 28 Jan 2012 16:20:29 +1100
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Cc: DNSEXT Working Group <dnsext@ietf.org>
Subject: Re: [dnsext] WGLC: draft-ietf-dnsext-dnssec-bis-updates-16
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In message <CACU5sDnS-3V26yKyvTGObR67H2LPiBjWxCZAbMpHPZrgXJeNFg@mail.gmail.com>
, Mohan Parthasarathy writes:

> - Section 5.7 setting the AD bit on queries. Is CD=0,DO=0 in the query
> same as AD=1,DO=0 ?

The question doesn't make sense.

AD=0,DO=1 and AD=1,DO=1 produce the same result.
AD=0,DO=0 and AD=1,DO=0 produce different results.
AD=0,DO=0 and AD=0,DO=1 produce different results.
AD=1,DO=0 and AD=0,DO=1 produce different results.

> missed the discussion on this earlier. If there is a valid reason,
> that needs to be stated explicitly as to why we are introducing this
> new option.
 
Section 5.7 explains why this option exists.

		This allows a requestor to indicate that it understands
   the AD bit without also requesting DNSSEC data via the DO bit.

Examples of AD=1 vs DO=1.

% dig +adflag soa . +noauth +noadd

; <<>> DiG 9.7.3-P3 <<>> +adflag soa . +noauth +noadd
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 41997
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 1, AUTHORITY: 13, ADDITIONAL: 0

;; QUESTION SECTION:
;.				IN	SOA

;; ANSWER SECTION:
.			86382	IN	SOA	a.root-servers.net. nstld.verisign-grs.com. 2012012701 1800 900 604800 86400

;; Query time: 2 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Sat Jan 28 16:03:34 2012
;; MSG SIZE  rcvd: 285

% dig +dnssec soa . +noauth +noadd

; <<>> DiG 9.7.3-P3 <<>> +dnssec soa . +noauth +noadd
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 61859
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 2, AUTHORITY: 14, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: do; udp: 4096
;; QUESTION SECTION:
;.				IN	SOA

;; ANSWER SECTION:
.			86372	IN	SOA	a.root-servers.net. nstld.verisign-grs.com. 2012012701 1800 900 604800 86400
.			86372	IN	RRSIG	SOA 8 0 86400 20120203000000 20120126230000 51201 . nhFWtVAAdecUyYiGqvYYLprczaXbhsR+XK2S+OPBrBWMAk9fPyNjRH7A rSu7I1qIBNstxAlUJ/ncn+lL5o88wDD2PZW4GXolzFc3LslvmyEcEhVe wHhPETDJEsR9rrpx1yt1o5EqhjzBrQNT4FPbmqse0z+r9v9uPCZlB+KQ OvE=

;; Query time: 1 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Sat Jan 28 16:03:44 2012
;; MSG SIZE  rcvd: 612

% 

-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka@isc.org

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