LinuxQuestions.org - CNAME records

- Linux - Server (https://www.linuxquestions.org/questions/linux-server-73/)

- - CNAME records (https://www.linuxquestions.org/questions/linux-server-73/cname-records-753500/)

Hello,
I have a problem in querying a CNAME record.

sci3ntist@sci3ntist-laptop:~$ nslookup
> set q=cname
> film.jo
Server: 192.168.1.1
Address: 192.168.1.1#53

Non-authoritative answer:
*** Can't find film.jo: No answer

Authoritative answers can be found from:
film.jo
origin = ns1.dot.jo
mail addr = hkhayyat.dot.jo
serial = 2009080925
refresh = 10800
retry = 3600
expire = 604800
minimum = 86400
> autodiscover.film.jo
Server: 192.168.1.1
Address: 192.168.1.1#53

Non-authoritative answer:
autodiscover.film.jo canonical name = autodiscover.outlook.com.

Authoritative answers can be found from:
film.jo nameserver = ns1.dot.jo.
film.jo nameserver = ns2.dot.jo.
ns1.dot.jo internet address = 207.210.211.118
ns2.dot.jo internet address = 207.210.208.138

http://www.ops.ietf.org/lists/namedr.../msg02244.html

I really Can't figure out if I have to query about the cname do I type nslookup => set q=cname => film.jo

or as mentioned in the link above? Since the hosting company I deal with says that there is a valid cname and I'm confused about it.

Thanks in advance.

I advise you to use dig for your lookups since nslookup is deprecated. In fact the link you've mentioned is from 1995!!

Code:

dig cname autodiscover.film.jo

you mean to query the cname you have to specify autodiscover.film.jo not film.jo unlike MX record. Am I right?

sci3ntist@sci3ntist-laptop:~$ dig cname autodiscover.film.jo

; <<>> DiG 9.5.0-P2 <<>> cname autodiscover.film.jo
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 60331
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 2

;; QUESTION SECTION:
;autodiscover.film.jo. IN CNAME

;; ANSWER SECTION:
autodiscover.film.jo. 84153 IN CNAME autodiscover.outlook.com.

;; AUTHORITY SECTION:
film.jo. 8676 IN NS ns2.dot.jo.
film.jo. 8676 IN NS ns1.dot.jo.

;; ADDITIONAL SECTION:
ns1.dot.jo. 12037 IN A 207.210.211.118
ns2.dot.jo. 2587 IN A 207.210.208.138

;; Query time: 67 msec
;; SERVER: 192.168.1.1#53(192.168.1.1)
;; WHEN: Tue Sep 8 05:47:04 2009
;; MSG SIZE rcvd: 148

sci3ntist@sci3ntist-laptop:~$ dig cname film.jo

; <<>> DiG 9.5.0-P2 <<>> cname film.jo
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 55291
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;film.jo. IN CNAME

;; AUTHORITY SECTION:
film.jo. 8344 IN SOA ns1.dot.jo. hkhayyat.dot.jo. 2009080925 10800 3600 604800 86400

;; Query time: 56 msec
;; SERVER: 192.168.1.1#53(192.168.1.1)
;; WHEN: Tue Sep 8 05:47:21 2009
;; MSG SIZE rcvd: 78

sci3ntist@sci3ntist-laptop:~$ dig mx film.jo

; <<>> DiG 9.5.0-P2 <<>> mx film.jo
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 11946
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 2

;; QUESTION SECTION:
;film.jo. IN MX

;; ANSWER SECTION:
film.jo. 8517 IN MX 10 423164467.mail.outlook.com.

;; AUTHORITY SECTION:
film.jo. 8517 IN NS ns1.dot.jo.
film.jo. 8517 IN NS ns2.dot.jo.

;; ADDITIONAL SECTION:
ns1.dot.jo. 11878 IN A 207.210.211.118
ns2.dot.jo. 2428 IN A 207.210.208.138

;; Query time: 23 msec
;; SERVER: 192.168.1.1#53(192.168.1.1)
;; WHEN: Tue Sep 8 05:49:42 2009
;; MSG SIZE rcvd: 139

Quote:

you mean to query the cname you have to specify autodiscover.film.jo not film.jo unlike MX record. Am I right?

Yes you have to specify a FQDN to find if it's a CNAME. As for MX and NS, they are special RRs for a domain that's why you can query for them using the domain name.
Only if the name server allows domain transfers to you, you can do an AXFR to find CNAMEs.