Maintained by: NLnet Labs

[Unbound-users] austereo.castmetrix.net

Leen Besselink
Tue Feb 17 12:42:31 CET 2009


On Tue, Feb 17, 2009 at 01:20:59AM -0500, Paul Wouters wrote:
> On Mon, 16 Feb 2009, krishna e bera wrote:
> 
> > > Anyone able to lookup austereo.castmetrix.net?
> > > 
> > > I tried using the resolvers running Unbound but keep getting NXDOMAIN. 
> > > resolvers running BIND however returns the following:
> 
> I got ServFail.
> 
> it first gets the CNAME:
> 
> austereo.castmetrix.net is an alias for austereo.castmetrixcdn.net.
> 
> 
> Seems there is only 1 NS for castmetrixcdn.net, which is
> ns1.castmetrixcdn.com. There is only one NS for castmetrixcdn.com,
> which is ns1.castmetrixcdn.com.. So glue is needed from .com.
> 
> ..com lists 2 NS records (ns1.castmetrixcdn.com. and ns2.castmetrixcdn.com,
> both resolving to 76.74.248.77, which is the recursive nameserver. unbound
> drops the second NS because the glue is bad, the child zone gives NXDOMAIN.
> 
> unbound does get there:
> 
> [1234850471] libunbound[14359:0] info: response for <ns2.castmetrixcdn.com. A IN>
> [1234850471] libunbound[14359:0] info: reply from <castmetrixcdn.com.> 76.74.248.77#53
> [1234850471] libunbound[14359:0] info: query response was ANSWER
> 
> But if you try to get an answer from there:
> 
> dig -t ns  +norecurse austereo.castmetrix.net @76.74.248.77
> 
> ;; QUESTION SECTION:
> ;austereo.castmetrix.net.	IN	NS
> 
> ;; AUTHORITY SECTION:
> castmetrix.net.		3600	IN	SOA	castmetrix.net. ns1.castmetrix.com.castmetrix.net. 2008031101 86400 3600 86400 3600
> 
> It does not know the answer. I am not sure where bind picked up the
> answer (mine does the same, it did find it)
> 

PowerDNS-recursor (3.1.8pre with EDNS-ping) also works (with a second try after clearing the cache, but see below).

I don't have a bind setup here to test, the Unbound (1.2.0) I have running did give the right results.

Although I have found running: dig +trace austereo.castmetrix.net. several times gives
different results (and dig is from ISC, so possible works like bind was intended or
something).

I had a look at a few pcap dumps I make, but I didn't see right away what the problem
was. I assume the .net-TLD-nameservers might be running different versions/implementations
and deal differently with the intended NS-/glue-records for the domain ?

;; Received 501 bytes from 2001:7fd::1#53(k.root-servers.net) in 22 ms

castmetrixcdn.net.      172800  IN      NS      ns1.castmetrixcdn.com.
castmetrixcdn.net.      172800  IN      NS      ns2.castmetrixcdn.com.
;; Received 129 bytes from 192.54.112.30#53(h.gtld-servers.net) in 20 ms

dig: couldn't get address for 'ns2.castmetrixcdn.com': not found
__

;; Received 497 bytes from 192.36.148.17#53(i.root-servers.net) in 30 ms

castmetrixcdn.net.      172800  IN      NS      ns1.castmetrixcdn.com.
castmetrixcdn.net.      172800  IN      NS      ns2.castmetrixcdn.com.
;; Received 129 bytes from 192.12.94.30#53(E.GTLD-SERVERS.net) in 142 ms

austereo.castmetrixcdn.net. 3600 IN     A       66.186.45.186
austereo.castmetrixcdn.net. 3600 IN     A       209.11.241.178
austereo.castmetrixcdn.net. 3600 IN     A       66.186.49.74
austereo.castmetrixcdn.net. 3600 IN     A       209.11.243.122
castmetrixcdn.net.      3600    IN      NS      ns1.castmetrixcdn.com.
;; Received 197 bytes from 76.74.248.77#53(ns1.castmetrixcdn.com) in 158 ms

;; Received 129 bytes from 192.31.80.30#53(D.GTLD-SERVERS.net) in 117 ms

austereo.castmetrixcdn.net. 3600 IN     A       209.11.241.178
austereo.castmetrixcdn.net. 3600 IN     A       66.186.49.74
austereo.castmetrixcdn.net. 3600 IN     A       209.11.243.122
austereo.castmetrixcdn.net. 3600 IN     A       66.186.45.186
castmetrixcdn.net.      3600    IN      NS      ns1.castmetrixcdn.com.
;; Received 197 bytes from 76.74.248.77#53(ns1.castmetrixcdn.com) in 158 ms

__

;; Received 501 bytes from 2001:500:1::803f:235#53(h.root-servers.net) in 238 ms

castmetrixcdn.net.      172800  IN      NS      ns1.castmetrixcdn.com.
castmetrixcdn.net.      172800  IN      NS      ns2.castmetrixcdn.com.
;; Received 129 bytes from 2001:503:231d::2:30#53(b.gtld-servers.net) in 118 ms

austereo.castmetrixcdn.net. 3600 IN     A       66.186.45.186
austereo.castmetrixcdn.net. 3600 IN     A       209.11.241.178
austereo.castmetrixcdn.net. 3600 IN     A       66.186.49.74
austereo.castmetrixcdn.net. 3600 IN     A       209.11.243.122
castmetrixcdn.net.      3600    IN      NS      ns1.castmetrixcdn.com.
;; Received 197 bytes from 76.74.248.77#53(ns1.castmetrixcdn.com) in 157 ms

__

;; Received 501 bytes from 2001:dc3::35#53(m.root-servers.net) in 172 ms

castmetrixcdn.net.      172800  IN      NS      ns1.castmetrixcdn.com.
castmetrixcdn.net.      172800  IN      NS      ns2.castmetrixcdn.com.
;; Received 129 bytes from 2001:503:a83e::2:30#53(A.GTLD-SERVERS.net) in 302 ms

austereo.castmetrixcdn.net. 3600 IN     A       209.11.243.122
austereo.castmetrixcdn.net. 3600 IN     A       66.186.45.186
austereo.castmetrixcdn.net. 3600 IN     A       209.11.241.178
austereo.castmetrixcdn.net. 3600 IN     A       66.186.49.74
castmetrixcdn.net.      3600    IN      NS      ns1.castmetrixcdn.com.
;; Received 197 bytes from 76.74.248.77#53(ns1.castmetrixcdn.com) in 156 ms

__

;; Received 501 bytes from 2001:500:3::42#53(l.root-servers.net) in 130 ms

castmetrixcdn.net.      172800  IN      NS      ns1.castmetrixcdn.com.
castmetrixcdn.net.      172800  IN      NS      ns2.castmetrixcdn.com.
;; Received 129 bytes from 192.26.92.30#53(c.gtld-servers.net) in 120 ms

dig: couldn't get address for 'ns2.castmetrixcdn.com': not found

__

;; Received 497 bytes from 2001:503:c27::2:30#53(j.root-servers.net) in 101 ms

castmetrixcdn.net.      172800  IN      NS      ns1.castmetrixcdn.com.
castmetrixcdn.net.      172800  IN      NS      ns2.castmetrixcdn.com.
;; Received 129 bytes from 192.35.51.30#53(F.GTLD-SERVERS.net) in 168 ms

austereo.castmetrixcdn.net. 3600 IN     A       66.186.49.74
austereo.castmetrixcdn.net. 3600 IN     A       209.11.243.122
austereo.castmetrixcdn.net. 3600 IN     A       66.186.45.186
austereo.castmetrixcdn.net. 3600 IN     A       209.11.241.178
castmetrixcdn.net.      3600    IN      NS      ns1.castmetrixcdn.com.
;; Received 197 bytes from 76.74.248.77#53(ns1.castmetrixcdn.com) in 154 ms

> Paul
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