[Bug 1774342] Re: /lib/systemd/system/isc-dhcp-server.service $INTERFACES variable

[Utkarsh Gupta]

*** This bug is a duplicate of bug 1894172 ***
    https://bugs.launchpad.net/bugs/1894172

** Also affects: isc-dhcp (Ubuntu Groovy)
   Importance: Undecided
       Status: New

** Also affects: isc-dhcp (Ubuntu Hirsute)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1774342

Title:
  /lib/systemd/system/isc-dhcp-server.service $INTERFACES variable

Status in isc-dhcp package in Ubuntu:
  New
Status in isc-dhcp source package in Bionic:
  New
Status in isc-dhcp source package in Focal:
  New
Status in isc-dhcp source package in Groovy:
  New
Status in isc-dhcp source package in Hirsute:
  New

Bug description:
  package: isc-dhcp-server

  /etc/default/isc-dhcp-server define the variables INTERFACESv4 and
  INTERFACESv6 for define listening network interface, but
  /lib/systemd/system/isc-dhcp-server.service and /lib/systemd/system
  /isc-dhcp-server6.service use the variable INTERFACES (exec dhcpd
  -user dhcpd -group dhcpd -f -4 -pf /run/dhcp-server/dhcpd.pid -cf
  $CONFIG_FILE $INTERFACES'). This causes the service to listen on all
  interfaces.

  The correct way would be for /lib/systemd/system/isc-dhcp-server.service:
  ......
   exec dhcpd -user dhcpd -group dhcpd -f -4 -pf /run/dhcp-server/dhcpd.pid -cf $CONFIG_FILE $INTERFACESv4'
  ......

  for /lib/systemd/system/isc-dhcp-server.service:
  ......
  exec dhcpd -user dhcpd -group dhcpd -f -6 -pf /run/dhcp-server/dhcpd6.pid -cf $CONFIG_FILE $INTERFACESv6'
  .........

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