Reverse Zone CIDR

Jonathan Del Campo jdc at mikrosimage.eu
Mon May 30 10:25:59 UTC 2016


Thansk guys for the reply.
We have split the /23 reverse definition in two /24, but it seems the dhcpd
doesn't update the new created arpa zone files.

Can you confirm my dhpcd config ?

subnet 192.168.222.0 netmask 255.255.254.0 {
        # pool d'adresses IP dynamiques
        pool {
                range 192.168.222.20 192.168.222.253;
                range 192.168.223.20 192.168.223.250;
        }

        ddns-domainname                 "domain.int";
        option routers                  192.168.223.254; # default gateway
        option subnet-mask              255.255.254.0;
        option broadcast-address        192.168.223.255;
        # Entrées pour le serveur Fog
        next-server                     192.168.200.19;
        filename                        "undionly.kpxe";
        allow bootp;
        allow booting;

        # Zone reverse
        zone 222.168.192.in-addr.arpa. {
                primary 192.168.200.1;
                key domain.int;
        }
        zone 223.168.192.in-addr.arpa. {
                primary 192.168.200.1;
                key domain.int;
        }
}

many thanks.
J


On Thu, May 26, 2016 at 12:44 AM, /dev/rob0 <rob0 at gmx.co.uk> wrote:

> On Wed, May 25, 2016 at 12:06:40PM +0100, Tony Finch wrote:
> > Jonathan Del Campo <jdc at mikrosimage.eu> wrote:
> > >
> > > So if I have to create two /24 reverse zones for my case, I will,
> > > but I was hopping a smarter solution.
> >
> > Oh, I had a brainfart, I read /23 as /25 :-)
>
> I figured that was what you were thinking. :)
>
> > Yes, two /24s is the best solution.
> >
> > For smarter solutions, see the rfc2317bis I-D, though they are
> > usually not an option, depending on how the parent /16 zone is run.
>
> In this case, being a netblock from RFC 1918, another choice is to
> actually run that /16 zone ... 168.192.in-addr.arpa.
> --
>   http://rob0.nodns4.us/
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