Actually, I'm getting mostly no resolution for these sites.  Ever so often I 
will get resolution after multiple nslookup attempts.  
 
Another weird thing that happened today is with the "named -4" trigger, my 
internal resolution broke.  I killed the named service and started bind 
normally so now I'm back to all the AAAA request in my logs.

>>> "Kevin Darcy" <k...@chrysler.com> 10/12/2012 1:47 PM >>>
OK, so your nbc.com/A resolving error doesn't really have anything to do with 
the nameservers you included in your original post.

It does appear, however, that ns2.netbcp.net (205.173.93.213) is refusing 
requests generally for the nbc.com domain:

$  dig nbc.com +buf=4096 +norec @ns2.netbcp.net

; <<>> DiG 9.4.3-P3 <<>> nbc.com +buf=4096 +norec @ns2.netbcp.net
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: REFUSED, id: 1019
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;nbc.com.                       IN      A

;; Query time: 30 msec
;; SERVER: 205.173.93.213#53(205.173.93.213)
;; WHEN: Fri Oct 12 13:44:56 2012
;; MSG SIZE  rcvd: 36

ns1.netbcp.com appears to be doing the same thing.

Not known whether this is something temporary (performing maintenance?), or 
something permanent (provider's contract lapsed, but customer never updated 
delegations).

In any case, you have enough working authoritative nameservers for the domain, 
so it'll continue to resolve for you...

                                                                                
                    - Kevin



On 10/12/2012 1:35 PM, James Tingler wrote:


I don't think that I am.  I only define internal forwarders for internal zones 
as needed.  For my root hint, standard configuration:
Named.conf
 
zone "." {
        type hint;
        file "named.ca";
Named.ca:
 
; <<>> DiG 9.5.0b2 <<>> +bufsize=1200 +norec NS . @a.root-servers.net
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 34420
;; flags: qr aa; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 20
 
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;.                              IN      NS
 
;; ANSWER SECTION:
.                       518400  IN      NS      M.ROOT-SERVERS.NET.
.                       518400  IN      NS      A.ROOT-SERVERS.NET.
.                       518400  IN      NS      B.ROOT-SERVERS.NET.
.                       518400  IN      NS      C.ROOT-SERVERS.NET.
.                       518400  IN      NS      D.ROOT-SERVERS.NET.
.                       518400  IN      NS      E.ROOT-SERVERS.NET.
.                       518400  IN      NS      F.ROOT-SERVERS.NET.
.                       518400  IN      NS      G.ROOT-SERVERS.NET.
.                       518400  IN      NS      H.ROOT-SERVERS.NET.
.                       518400  IN      NS      I.ROOT-SERVERS.NET.
.                       518400  IN      NS      J.ROOT-SERVERS.NET.
.                       518400  IN      NS      K.ROOT-SERVERS.NET.
.                       518400  IN      NS      L.ROOT-SERVERS.NET.
 
;; ADDITIONAL SECTION:
A.ROOT-SERVERS.NET.     3600000 IN      A       198.41.0.4
A.ROOT-SERVERS.NET.     3600000 IN      AAAA    2001:503:ba3e::2:30
B.ROOT-SERVERS.NET.     3600000 IN      A       192.228.79.201
C.ROOT-SERVERS.NET.     3600000 IN      A       192.33.4.12
D.ROOT-SERVERS.NET.     3600000 IN      A       128.8.10.90
E.ROOT-SERVERS.NET.     3600000 IN      A       192.203.230.10
F.ROOT-SERVERS.NET.     3600000 IN      A       192.5.5.241
F.ROOT-SERVERS.NET.     3600000 IN      AAAA    2001:500:2f::f
G.ROOT-SERVERS.NET.     3600000 IN      A       192.112.36.4
H.ROOT-SERVERS.NET.     3600000 IN      A       128.63.2.53
H.ROOT-SERVERS.NET.     3600000 IN      AAAA    2001:500:1::803f:235
I.ROOT-SERVERS.NET.     3600000 IN      A       192.36.148.17
J.ROOT-SERVERS.NET.     3600000 IN      A       192.58.128.30
J.ROOT-SERVERS.NET.     3600000 IN      AAAA    2001:503:c27::2:30
K.ROOT-SERVERS.NET.     3600000 IN      A       193.0.14.129
K.ROOT-SERVERS.NET.     3600000 IN      AAAA    2001:7fd::1
L.ROOT-SERVERS.NET.     3600000 IN      A       199.7.83.42
M.ROOT-SERVERS.NET.     3600000 IN      A       202.12.27.33
M.ROOT-SERVERS.NET.     3600000 IN      AAAA    2001:dc3::35
 
;; Query time: 147 msec
;; SERVER: 198.41.0.4#53(198.41.0.4)
;; WHEN: Mon Feb 18 13:29:18 2008
;; MSG SIZE  rcvd: 615

"named.ca" 52L, 1892C


>>> "Kevin Darcy" <k...@chrysler.com> ( mailto:k...@chrysler.com ) 10/12/2012 
>>> 1:20 PM >>>
On 10/12/2012 12:28 PM, James Tingler wrote:


Hello,
 
I'm getting what appears to be a common "error (unexpected RCODE REFUSED) 
resolving" error.  My research has lead me to disable IPv6 when starting the 
named service with "named -4" as it could be related to IPv6 broken 
connectivity (of which we been actively deploying and testing).  This has taken 
away the AAAA log activity but I still get the error:
 
Oct 12 16:06:55 prod75-dns1 named[23866]: error (unexpected RCODE REFUSED) 
resolving 'nbc.com/A/IN': 205.173.93.213#53
 
Exploring this more, almost all domains I'm having problems with (as discovered 
through dig) is related to this forwarder:
nationalmap.gov. 5M IN NS rdsdns5.ultradns.net. nationalmap.gov. 5M IN NS 
rdsdns1.ultradns.net. nationalmap.gov. 5M IN NS rdsdns2.ultradns.net. 
nationalmap.gov. 5M IN NS rdsdns6.ultradns.net. nationalmap.gov. 5M IN NS 
rdsdns3.ultradns.net. nationalmap.gov. 5M IN NS 
rdsdns4.ultradns.net.linkedin.com, nbc.com, nationalmap.gov
nbc.com is not hosted on those nameservers:

nbc.com.                86400   IN      NS      pdns1.ultradns.net.
nbc.com.                86400   IN      NS      pdns2.ultradns.net.
nbc.com.                86400   IN      NS      pdns3.ultradns.org.
nbc.com.                86400   IN      NS      pdns4.ultradns.org.
nbc.com.                86400   IN      NS      pdns5.ultradns.info.
nbc.com.                86400   IN      NS      pdns6.ultradns.co.uk.
nbc.com.                86400   IN      NS      ns1.netbcp.com.
nbc.com.                86400   IN      NS      ns2.netbcp.net.

Neither is linkedin.com.

I hope you're not trying to use authoritative nameservers as "forwarders" in 
the strict BIND sense. If you have full Internet connectivity, there's really 
no reason to be forwarding at all. Configure your root hints and be happy.




Note - I'm also seeing plenty of lame server and EDNS errors. 
Those are fairly normal.

                                                                        - Kevin


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