#943804 error message says missing subnet declaration for down interface

Package:
isc-dhcp-server
Source:
isc-dhcp
Description:
ISC DHCP server for automatic IP address assignment
Submitter:
積丹尼 Dan Jacobson
Date:
2019-10-30 02:33:08 UTC
Severity:
minor
#943804#5
Date:
2019-10-29 21:24:54 UTC
From:
To:
This error message is wrong:

No subnet declaration for wlp2s0b1 (no IPv4 addresses).
** Ignoring requests on wlp2s0b1.  If this is not what
   you want, please write a subnet declaration
   in your dhcpd.conf file for the network segment
   to which interface wlp2s0b1 is attached. **

Proof:
$ make dhcpd #will produce this message
$ make w r dhcpd #will not produce this message, and work fine.

The error is the interface is not up, not that the dhcpd.conf needs to
be changed!