we implement a till suggestion, i dunno if is useful to you...
below is what we do
1. we have a template with
Code:
[ZONE]
origin={DOMAIN}.
ns=some.dom.tld.
mbox=domains.dom.tld.
refresh=3600
retry=7200
expire=3600
minimum=86400
ttl=3600
xfer=common-allow-transfer
[DNS_RECORDS]
into named.conf.options
Code:
acl common-allow-transfer { ip1;ip2;...;}
then in option
Code:
options {
[...]
allow-transfer {common-allow-transfer; };
and so on....