** Description changed:
The behaviour of the `systemd` unit `isc-dhcp-server.service` is the
same as on the command line: both `sudo dhcpd` and `sudo dhcpd p18p1`
(where `p18p1` is the name of a network interfaces) cause the daemon to
listen on all interfaces according to `sudo netstat -tu
In Ubuntu 18.04.1 it appears that the environment initialization file
/etc/default/isc-dhcp-server
defines INTERFACESv4 and INTERFACESv6, but both the systemd unit files
/lib/systemd/system/isc-dhcp-server.service
/lib/systemd/system/isc-dhcp-server6.service
expand "INTERFACES".
P.S.: So
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