Reverse DDNS on classless zones
atif yameen
atifyameen at hotmail.com
Wed Jul 18 03:38:16 UTC 2012
Hi,
I am trying to do reverse DDNS on a classless zone. I have configured my zone declaration in dhcpd.conf as follow:
zone 128-25.25.119.129.in-addr.arpa
{
primary 129.119.65.10;
}
=======================also in dhcpd.conf====================
subnet 129.119.25.128 netmask 255.255.255.128
{
option subnet-mask 255.255.255.128;
option broadcast-address 129.119.25.255;
ddns-updates true;
one-lease-per-client true;
ping-check false;
max-lease-time 604800;
min-lease-time 600;
default-lease-time 604800;
do-reverse-updates true;
dynamic-bootp-lease-length 604800;
ddns-domainname "a.b.com";
ddns-rev-domainname "128-25.25.119.129.in-addr.arpa";
and the following is my reverse zone in named.conf
zone "128-25.25.119.129.in-addr.arpa"
{
type master;
file "4981050.65ED25AA06C49D877204B11DDCB30C43.db";
allow-transfer { x.x.x.x; };
allow-update { <IP-Address-of-DHCP-Server; };
also-notify { x.x.x.x; };
};
when a client in the said network obtains an ip address, the dhcp server registers its reverse name as follows :
Jul 17 20:25:37 new dhcpd: Added reverse map from 250.25.119.129.128-25.25.119.129.in-addr.arpa to a.b.com
where as it should be : 250.128-25.25.119.129.in-addr.arpa
zone file shows the following: (creates a subzone 129 and then a dotted name from the rest of the three octets)
$ORIGIN 129.128-25.25.119.129.in-addr.arpa.
$TTL 302400 ; 3 days 12 hours
250.25.119 PTR a.b.com.
Any Ideas why this is happening?
Thanks
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