This is tracked in Debian here:

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=715027

On 05/07/13 17:45, Daniel Pocock wrote:
> Package: isc-dhcp-server
> Version: 4.2.2.dfsg.1-5+deb70u6
> Severity: important
> 
> I have
> 
> update-static-leases true;
> 
> in my dhcpd6.conf
> 
> If a host is defined with a fixed-address, the DDNS updates are not
> generated.
> 
> If I comment out the host definition and let the host obtain an address
> dynamically the DDNS updates work
> 
> 
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