root@server:~# dhcpd -6 -d -cf /etc/dhcp/dhcpd6.conf enp2s0
Internet Systems Consortium DHCP Server 4.3.5
Copyright 2004-2016 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
Config file: /etc/dhcp/dhcpd6.conf
Database file: /var/lib/dhcp/dhcpd6.leases
PID file: /var/run/dhcpd6.pid
Wrote 0 NA, 0 TA, 0 PD leases to lease file.
No subnet6 declaration for enp2s0 (2001:470:1f1a:5b3::2).
** Ignoring requests on enp2s0. If this is not what
you want, please write a subnet6 declaration
in your dhcpd.conf file for the network segment
to which interface enp2s0 is attached. **
Not configured to listen on any interfaces!
If you think you have received this message due to a bug rather
than a configuration issue please read the section on submitting
bugs on either our web page at www.isc.org or in the README file
before submitting a bug. These pages explain the proper
process and the information we find helpful for debugging..