How to CNAME in Bind ?

Jason.01 · 05-17-2014, 09:59 AM

Im configuring Bind9 in my VM and im having problem creating a CNAME for SMTP and webmail which points/maps to my domain name.

In my forward zone file I have that code , witch lets me nslookup my domain but not SMTP. How do you cname this properly?

The error I get is: smtp.stylez24.com: NXDOMAIN

Quote:

; BIND data file for local loopback interface;
$TTL 604800
@ IN SOA server.stylez24.com. admin.stylez24.com. (
2 ; Serial
604800 ; Refresh
86400 ; Retry
2419200 ; Expire
604800 ) ; Negative Cache TTL
;

stylez24.com. IN NS stylez24.com.
stylez24.com. IN A 192.168.10.1

@ IN A 127.0.0.1
@ IN AAAA ::1
www IN CNAME stylez24.com.
smtp IN CNAME stylez24.com.
stylez IN A 192.168.10.1
smtp IN A 192.168.10.2

IN MX 10 mail.stylez24.com.
mail IN CNAME server

bathory · 05-17-2014, 12:33 PM

Hi,

Your zonefile is wrong.
You have both a CNAME and an A RR for smtp.stylez24.com. You should use only one (better leave the A RR)
Also the mail CNAME points to a non existent hostname. Besides that, it's advisable that MX should not be a CNAME, because some mailservers will complain.
Try the following and see if it works:

Code:

$TTL 604800
@ IN SOA server.stylez24.com. admin.stylez24.com. (
    3 ; Serial
    604800 ; Refresh
    86400 ; Retry
    2419200 ; Expire
    604800 ) ; Negative Cache TTL
;

stylez24.com. IN NS stylez24.com.
stylez24.com. IN A 192.168.10.1

@ IN A 127.0.0.1
@ IN AAAA ::1
www IN CNAME stylez24.com.
stylez IN A 192.168.10.1
smtp IN A 192.168.10.2

IN MX 10 mail.stylez24.com.
mail IN A 192.168.10.2

Jason.01 · 05-17-2014, 03:53 PM

This does work out. But can i not point smtp to my domain or host ? does it need to have a different ip ?

bathory · 05-18-2014, 03:19 AM

Quote:

Originally Posted by Jason.01

This does work out. But can i not point smtp to my domain or host ? does it need to have a different ip ?

You can point your domain and hosts to whatever IP you like. Usually the domain and the www resolve to the same IP, so you can browse to either http://domain.com and http://www.domain.com
Regarding MX, it should point to the host that is running a smtp server. Usually the smtp server is a different box from the webserver, so MX uses a different IP. If smtp and web servers run on the same box, then they both point to the same IP