In Support #11511, BlueCat have asked us if we can
implement a dhcp-cache-threshold feature for v6 that
works more or less the way the existing feature works
for v4.

> Hello,
>
> The man pages for dhcpd.conf state that the 'dhcp-cache-threshold'
> option is only available for v4.
>
> Is there any reason for not implementing this option for v6?  We
> are observing misbehaving dhcpv6 clients in a customer's environment
> that are renewing at a rate of almost 1 per second, which causes
> an impact in our integrated IPAM solution as we relay those
> notifications back to our management system.
>
> Fernando