multiple subnets same ddns zone

[Glenn Satchell]

This is from dhcpd.conf man page:

       ddns-rev-domainname name; The name parameter should be the
       domain name that will be appended to the client's reversed
       IP address to produce a name for use in the  client's  PTR
       record.    By  default,  this  is "in-addr.arpa.", but the
       default can be overridden here.

       The reversed IP address  to  which  this  domain  name  is
       appended is always the IP address of the client, in dotted
       quad notation, reversed - for example, if the  IP  address
       assigned  to  the client is 10.17.92.74, then the reversed
       IP address is 74.92.17.10.   So  a  client  with  that  IP
       address  would,  by  default,  be  given  a  PTR record of
       10.17.92.74.in-addr.arpa.

Usually you want the default value. In your case you are creating a
reverse of, for example, 4.1.0.10.1.0.10.in-addr.arpa.

Oh, and the subnet mask is not /27 for the first subnet.

regards,
-glenn

>Date: Thu, 27 Aug 2009 22:41:23 -0500
>From: "Terry L. Inzauro" <tinzauro at ha-solutions.net>
>To: Users of ISC DHCP <dhcp-users at lists.isc.org>
>Subject: multiple subnets same ddns zone
>
>is it possible to have multiple subnets defined (for instance 10.0.1.0/27 and 
10.0.1.32/27 within 10.0.1.0/24) and then have
>both subnets update the same reverse dns zone such as 1.0.10.in-addr.arpa?
>
>if so, can i have some pointers on how to do it?
>
>
>this is what i currently have:
>
>ddns-update-style interim;
>option domain-name-servers host1, host2;
>option ntp-servers pool.ntp.org;
>default-lease-time 2628000;
>max-lease-time 2628000;
>#authoritative;
>log-facility local7;
>one-lease-per-client on;
>option time-offset -6;
>do-forward-updates off;
>
>
># define the key used for ddns updates to local bind9 server
>key dydns {
>        algorithm hmac-md5;
>        secret thisisthesecret;
>        }
># primary reverse zone for 1.0.10.in-addr.arpa
>zone 1.0.10.in-addr.arpa. {
>        primary localhost;
>        key dydns;
>        }
>
># 10.0.1.0/27

The netmask here doesn't match /27

>subnet 10.0.1.0 netmask 255.255.255.0 {
>        default-lease-time 2628000;
>        ddns-updates on;
>        #ddns-domainname "example.org";
>        ddns-rev-domainname "1.0.10.in-addr.arpa.";
>        authoritative;
>        deny client-updates;
>        allow unknown-clients;
>        option routers 10.0.1.1;
>
>        pool {
>                range 10.0.1.4 10.0.1.30;
>                }
>        }
># 10.0.1./27
>subnet 10.0.1.32 netmask 255.255.255.224 {
>        default-lease-time 2628000;
>        ddns-updates on;
>        #ddns-domainname "example.org";
>        ddns-rev-domainname "1.0.10.in-addr.arpa.";
>        authoritative;
>        deny client-updates;
>        allow unknown-clients;
>        option routers 10.0.1.36;
>
>        pool {
>                range 72.22.210.228 72.22.210.254;
>        }
>}
>
>
>any help would be greatly appreciated.
>
>
>
>
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