DNS resolution errors

Question

Hi everyone,
This is weird, or not. I don't know much about DNS so any help is greatly appreciated. When trying to do nslookups on external adresses, my primary DNS server returns a non-authoritative answer. example below:
andrew-caldwells-macbook-pro:~ andrew$ nslookup www.google.com
Server: 192.168.1.32
Address: 192.168.1.32#53
Non-authoritative answer:
www.google.com canonical name = www.l.google.com.
Name: www.l.google.com
Address: 64.233.169.104
Name: www.l.google.com
Address: 64.233.169.147
Name: www.l.google.com
Address: 64.233.169.99
Name: www.l.google.com
Address: 64.233.169.103
When trying to do a nslookup on an internal address I get a SERVFAIL. example below:
andrew-caldwells-macbook-pro:~ andrew$ nslookup mail.mnn.org
;; Got SERVFAIL reply from 192.168.1.32, trying next server
Server: 192.168.1.27
Address: 192.168.1.27#53
mail.mnn.org canonical name = od-replica.mnn.org.
Name: od-replica.mnn.org
Address: 192.168.1.27
When performing external lookups from the primary DNS server I get non-authoritative answers as above. When performing lookups on internal address from the primary I get SERVFAIL, example below:
od-master:~ admin$ nslookup db.mnn.org
Server: 192.168.1.32
Address: 192.168.1.32#53
** server can't find db.mnn.org.mnn.org: SERVFAIL
What's the deal?
TIA,
Andrew

Answer 1

I can di to apple.com with no errors:
andrew-caldwells-macbook-pro:~ andrew$ dig www.apple.com
; <<>> DiG 9.4.2-P2 <<>> www.apple.com
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 15806
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 9, ADDITIONAL: 4
;; QUESTION SECTION:
;www.apple.com. IN A
;; ANSWER SECTION:
www.apple.com. 1470 IN CNAME www.apple.com.akadns.net.
www.apple.com.akadns.net. 60 IN A 17.251.200.32
;; AUTHORITY SECTION:
akadns.net. 6545 IN NS usw2.akadns.net.
akadns.net. 6545 IN NS asia9.akadns.net.
akadns.net. 6545 IN NS za.akadns.org.
akadns.net. 6545 IN NS zb.akadns.org.
akadns.net. 6545 IN NS zc.akadns.org.
akadns.net. 6545 IN NS zd.akadns.org.
akadns.net. 6545 IN NS eur1.akadns.net.
akadns.net. 6545 IN NS use3.akadns.net.
akadns.net. 6545 IN NS use4.akadns.net.
;; ADDITIONAL SECTION:
za.akadns.org. 1734 IN A 195.219.3.169
zb.akadns.org. 1158 IN A 12.183.125.5
zc.akadns.org. 1058 IN A 124.211.40.4
zd.akadns.org. 589 IN A 204.2.178.133
;; Query time: 14 msec
;; SERVER: 192.168.1.27#53(192.168.1.27)
;; WHEN: Fri Jan 30 15:56:45 2009
;; MSG SIZE rcvd: 323
However digs using the primary DNS server to an internal address fail:
andrew-caldwells-macbook-pro:~ andrew$ dig mail.mnn.org
; <<>> DiG 9.4.2-P2 <<>> mail.mnn.org
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6245
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 1, ADDITIONAL: 1
;; QUESTION SECTION:
;mail.mnn.org. IN A
;; ANSWER SECTION:
mail.mnn.org. 3600 IN CNAME od-replica.mnn.org.
od-replica.mnn.org. 3600 IN A 192.168.1.27
;; AUTHORITY SECTION:
mnn.org. 3600 IN NS od-master.mnn.org.
;; ADDITIONAL SECTION:
od-master.mnn.org. 3600 IN A 192.168.1.32
;; Query time: 2 msec
;; SERVER: 192.168.1.32#53(192.168.1.32)
;; WHEN: Fri Jan 30 15:57:24 2009
;; MSG SIZE rcvd: 111
Digs to internal addresses using the backup are successful:
andrew-caldwells-macbook-pro:~ andrew$ dig @192.168.1.27 mail.mnn.org
; <<>> DiG 9.4.2-P2 <<>> @192.168.1.27 mail.mnn.org
; (1 server found)
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 44297
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 1, ADDITIONAL: 1
;; QUESTION SECTION:
;mail.mnn.org. IN A
;; ANSWER SECTION:
mail.mnn.org. 3600 IN CNAME od-replica.mnn.org.
od-replica.mnn.org. 3600 IN A 192.168.1.27
;; AUTHORITY SECTION:
mnn.org. 3600 IN NS od-master.mnn.org.
;; ADDITIONAL SECTION:
od-master.mnn.org. 3600 IN A 192.168.1.32
;; Query time: 2 msec
;; SERVER: 192.168.1.27#53(192.168.1.27)
;; WHEN: Fri Jan 30 15:58:40 2009
;; MSG SIZE rcvd: 111