[dns-operations] Odd EDNS implementation bug

[Tony Finch]

Some rr.com name servers put the answer RRset in the additional ssection
if you make an EDNS request:


; <<>> DiG 9.7.0-P2 <<>> +norec @65.24.6.70 cpe-75-81-112-75.kc.res.rr.com. A
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 24159
;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;cpe-75-81-112-75.kc.res.rr.com.        IN      A

;; ANSWER SECTION:
cpe-75-81-112-75.kc.res.rr.com. 604800 IN A     75.81.112.75

;; Query time: 106 msec
;; SERVER: 65.24.6.70#53(65.24.6.70)
;; WHEN: Wed May 26 19:27:21 2010
;; MSG SIZE  rcvd: 94


; <<>> DiG 9.7.0-P2 <<>> +bufsize=512 +norec @65.24.6.70 cpe-75-81-112-75.kc.res.rr.com. A
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 10801
;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;cpe-75-81-112-75.kc.res.rr.com.        IN      A

;; ADDITIONAL SECTION:
cpe-75-81-112-75.kc.res.rr.com. 604800 IN A     75.81.112.75

;; Query time: 111 msec
;; SERVER: 65.24.6.70#53(65.24.6.70)
;; WHEN: Wed May 26 19:27:39 2010
;; MSG SIZE  rcvd: 105


Tony.
-- 
f.anthony.n.finch  <dot at dotat.at>  http://dotat.at/
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MAINLY GOOD.