zone name for a reverse lookup zone
Mark.Andrews at nominum.com
Mark.Andrews at nominum.com
Fri May 11 14:34:33 UTC 2001
>
> At 10:50 AM +0000 5/11/01, syn uw wrote:
>
> > I am wondering what name I have to use for my reverse lookup zone name. I
> > have the following network address 195.45.43.72/29 and currently as zone
> > name I use: 43.45.195.in-addr.arpa, is that correct ? Or should I use
> > 72.43.45.195.in-addr.arpa ? Or doesn't it have any importance ?
>
> The name of the zone file is irrelevant. You could call it
> SlartyBartFast and it wouldn't make a single bit of difference. No
> one outside of your machine will ever see that filename.
>
> What is important is the fact that you tell BIND what the file
> contains, so that it can properly fill in the blanks. The label used
> in the "zone" definition in the /etc/named.conf file is how BIND
> determines what the origin (e.g., "@") will be defined to be.
>
>
> That said, to make your life in the future easier, and to make it
> easier for someone else to come in and help you with domain
> administration, it does make sense to apply certain rules to the
> filenames you use. Towards that end, using a name such as
> 72.43.45.195.in-addr.arpa would probably make more sense. You could
> also specify the ending fourth octet, and call it
> 72-80.43.45.195.in-addr.arpa.
>
What Brad failed to mention is that your ISP will need to
setup a series of CNAME records that point into this zone
from the 43.45.195.in-addr.arpa zone to allow the reverse
resolution to work. This need to be co-ordinated with your
ISP. You should also secondary this zone so that local
lookups will work if outside link is down.
This is all known as "Classless IN-ADDR.ARPA Delegation",
see RFC2317
zone "43.45.195.in-addr.arpa" {
type slave;
file "43.45.195.in-addr.arpa";
masters { 192.106.1.1; };
};
zone "72-80.43.45.195.in-addr.arpa" {
type master;
file "72-80.43.45.195.in-addr.arpa";
};
Mark
--
Mark Andrews, Nominum Inc.
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark.Andrews at nominum.com
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