[Bug 1690933] Re: isc-dhcp-server/dhcpd listens on 0.0.0.0:67/UDP no matter which interfaces is specified

[Enrico De Fent]

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.: Sorry, I previously "updated" the bug description by mistakenly
committing the same description again, I did not alter it actually.

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Title:
  isc-dhcp-server/dhcpd listens on 0.0.0.0:67/UDP no matter which
  interfaces is specified

Status in isc-dhcp package in Ubuntu:
  Confirmed

Bug description:
  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 -tupln | grep
  :67`:

      udp        0      0 0.0.0.0:67              0.0.0.0:*
  5382/dnsmasq

  The `isc-dhcp-server6.service` unit is deactivated.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: isc-dhcp-server 4.3.5-3ubuntu1
  ProcVersionSignature: Ubuntu 4.10.0-20.22-generic 4.10.8
  Uname: Linux 4.10.0-20-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
  ApportVersion: 2.20.4-0ubuntu4
  Architecture: amd64
  Date: Mon May 15 23:41:54 2017
  DhServerLeases:

  InstallationDate: Installed on 2015-04-20 (756 days ago)
  InstallationMedia: Ubuntu-Server 14.10 "Utopic Unicorn" - Release amd64 (20141022.2)
  ProcEnviron:
   TERM=screen.xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: isc-dhcp
  UpgradeStatus: Upgraded to zesty on 2017-05-05 (9 days ago)
  mtime.conffile..etc.dhcp.dhcpd.conf: 2017-05-15T23:37:21.502892

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