DDNS

[Chris Buxton]

How long have you been waiting for the updates to appear in the zone  
file before restarting the name server?

BIND 9 waits 15 minutes from the time of the first update before  
writing out the new version of the zone. Then it waits for another  
update, then starts the 15 minute timer again. This is to avoid  
constantly rewriting the zone and thrashing the disk.

Chris Buxton
Professional Services
Men & Mice

On Apr 9, 2008, at 11:21 AM, Charlie B wrote:
> Hello,
> Using:
> BIND 9.3.4
> DHCP 3.0.3
>
> I have configured dns and dhcp, ddns looks to be working successfully
> however I have noticed that dns is not writing the records to the  
> zone file
> until a restart.  Is this normal or how best would I discover the  
> problem
> behind this issue
>
> parts named.conf
>
> controls {
> inet 127.0.0.1 port 953
> allow { 127.0.0.1; 10.0.0.10; } keys { "rndckey"; "dhcpdupdate";};
> };
>
> key dhcpupdate {
>        algorithm hmac-md5;
>        secret "<blah>";
> };
>
>
>       zone "0.254.11.10.in-addr.arpa" {
>                type master;
>                file "/var/named/0.254.11.10.in-addr.arpa.zone";
>                allow-update { key dhcpupdate; };
>        };
>
>
> parts dhcpd.conf
>
> key dhcpupdate {
>        algorithm hmac-md5;
>        secret "<blah>";
> };
>
> update-static-leases on;
>
> subnet 10.11.254.0 netmask 255.255.255.0 {
>        option routers 10.11.254.1;
>        option broadcast-address 10.11.254.255;
>        ddns-rev-domainname "0.254.11.10.in-addr.arpa";
>        next-server 10.0.0.31;
>        pool {
>                allow members of "allocation-class-CNSUsers";
>                range 10.11.254.50 10.11.254.65;
>        }
>        pool {
>                allow unknown-clients;
>                deny known-clients;
>                range 10.11.254.245 10.11.254.250;
>        }
>
> }
>
> zone 0.254.11.10.in-addr.arpa. {
>        primary 10.0.0.10;
>        key dhcpupdate;
> }
>
>
>