why am I seeing update denied in Bind9 logs for dhcp clients ?

[Gregory Machin]

Hi.

I have a ddns configuration with the dhcpd server writing dhcp clients
hostname and ip to the bind9 dns server. But i'm seeing a lot of
dhcp clients trying to writing into zones

Mar  2 23:29:23 server01 named[18526]: client 192.168.69.138#52146:
view interenal: update 'example.com/IN' denied
Mar  2 23:29:23 server01 named[18526]: client 192.168.69.138#61284:
view interenal: update '69.168.192.in-addr.arpa/IN' denied

I have allowed dhcp server to write all records and clients to write
TXT records.


       zone "example.com" {
       type master;
               file "/var/lib/bind/example.com.hosts";
       update-policy { grant dhcp-server-key subdomain example.com. ANY;
                             grant * self * A TXT;
                               };
               check-names ignore;
               };

and

       zone "69.168.192.in-addr.arpa" {
       type master;
               file "/var/lib/bind/192.168.69.interenal.rev";
               update-policy { grant dhcp-server-key subdomain
69.168.192.in-addr.arpa. ANY;
                                     grant * self * A TXT;
                               };
               };

Why am is see these update requests, should I be allowing them, If I
should what have I done wrong in my config ?

Thanks