[Bind] Cname and subzone

[Heinrich Strauss]

Hi, Jacopo.

On 19/01/2013 17:10, Jacopo Cappelli wrote:
> I have a domain "example.com <http://example.com>" and i need to set a 
> cname:
> mycname.example.com <http://mycname.example.com> IN CNAME 
> ghs.google.com <http://ghs.google.com>.
>
> But i have a subzone
If you delegate a sub-zone, no other records will be read from the 
parent zone file, other than the NS records and glue records for the 
hosts to which the subzone is delegated.

The most common way of doing this set-up would be to create records in 
the parent zonefile (and not create a subzone). From RFC1912 
<http://www.simpledns.com/rfc/rfc1912.txt> section 2.4: /"A CNAME record 
is not allowed to coexist with any other data."/ This is especially true 
for NS and SOA records, which the subzone would require.

e.g. (for example.com)
-- begin
@ IN SOA ns.example.com. hostmaster.example.com. 2013011900 <defaults>
@ IN NS ns.example.com.
mycname IN MX 10 aspmx1.googlemail.com.
...
mycname IN CNAME ghs.google.com.
-- end

Note that you should include a trailing period if you specify 
mycname.example.com (i.e. your example record should read: 
mycname.example.com. IN CNAME ghs.google.com.)

Regards,
Strauss.