RE: Bind ip alias

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At 07:18 5/23/2004, Jason Staudenmayer wrote:
You should also use CNAME and not so many
A records. It should look like this


hosteddomain.com. IN A realip.address.com. ftp.hosteddomain.com IN CNAME hosteddomain.com. mail.hosteddomain.com IN CNAME hosteddomain.com. www.hosteddomain.com IN CNAME hosteddomain.com.

CAREFUL!


For a beginner it is often safer simply to use all A records. It is too easy to forget (as you just did) that MX records for mail CANNOT ever refer to CNAME records. They barf heavily and do not work. MX records MUST refer to an A record and not a CNAME.

Also, when using names in zonefiles like "mail.hosteddomain.com." remember to add the period at the end! You did not do so in several of the lines above, and the query will then ask for "mail.hosteddomain.com.hosteddomain.com." which is not what the user wants.

Here's one of my local zonefiles as an example:

[root@galileo root]# cat /var/named/chroot/var/named/domain.com.zone
$TTL    86400
$ORIGIN domain.com.
@                       IN SOA  @ root (
                                2004060501      ; serial
                                3H              ; refresh
                                15M             ; retry
                                1W              ; expiry
                                1D )            ; minimum

                        IN NS           @
                        IN A            192.168.4.1

galileo                 IN A            192.168.4.1
achilles                 IN A            192.168.4.2
mayo                 IN A            192.168.4.2
mail                 IN A            192.168.4.2
www                 IN A            192.168.4.2
ftp                 IN A            192.168.4.2

$GENERATE 3-255 ip$ A 192.168.4.$

Note how the use of the $ORIGIN variable allows me to use simple "local" names inside the zonefile. Since none of them end with a trailing period, all will have the origin tacked on to the end. Simple, easy, less prone to error.

Cheers,


-- Rodolfo J. Paiz rpaiz@xxxxxxxxxxxxxx http://www.simpaticus.com


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