On 3/6/11 12:06 AM, Dan wrote:
I have never seen a dns that gave a partial response as above,
containing both the response header *and* a trailer , that actually
meant that I should fark off because I'm not a valid user. There is a
BIG difference between a lookup failure, such as seen, vs a connection
refused error.
- Dan.
When querying against 205.233.35.3 (which I've configured to not allow
recursive queries from the test box, specifically for this test):
============================================
dig @205.233.35.3 www.google.com
; <<>> DiG 9.6.0-APPLE-P2 <<>> @205.233.35.3 www.google.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 43413
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: recursion requested but not available
;; QUESTION SECTION:
;www.google.com. IN A
;; Query time: 59 msec
;; SERVER: 205.233.35.3#53(205.233.35.3)
;; WHEN: Sun Mar 6 00:44:15 2011
;; MSG SIZE rcvd: 32
============================================
Like I said, some servers will just drop the queries on the floor.
Others, like my powerdns server, in this case, does exactly the same
thing that his provider's did for you (and me).
============================================
dig @216.68.4.10 www.google.com
; <<>> DiG 9.6.0-APPLE-P2 <<>> @216.68.4.10 www.google.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: REFUSED, id: 19854
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: recursion requested but not available
;; QUESTION SECTION:
;www.google.com. IN A
;; Query time: 113 msec
;; SERVER: 216.68.4.10#53(216.68.4.10)
;; WHEN: Sun Mar 6 00:47:46 2011
;; MSG SIZE rcvd: 32
============================================
Only difference is that mine does SERVFAIL, where this one did REFUSED.
We need him to do the query on a machine on his network, to eliminate us
being outside of his provider's network as being the cause.
--
Brielle Bruns
The Summit Open Source Development Group
http://www.sosdg.org / http://www.ahbl.org
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