How can dhclient request a prefix delegation of a specific length from provider?

[Mike]

On 10/1/2016 5:38 PM, John Ioannidis wrote:
> If I specify the -P option, my provider dutifully delegates me a /64.
> It will, however, delegate me a /56 if I ask for one. How do I specify
> the length of the prefix I want delegated?
> 
> If it's documented somewhere, I can't find it :(
> 


Here's a thread that you may find helpful...

https://lists.isc.org/pipermail/dhcp-users/2014-April/017796.html