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[Launchpad Bug Tracker <1524093@xxxxxxxxxxxxxxxxxx>]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: isc-dhcp (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1524093

Title:
  dhclient operates on incorrect interface

Status in isc-dhcp package in Ubuntu:
  Confirmed

Bug description:
  I have a system with two internet connections, both configured using
  DHCP. They are specified in /etc/network/interfaces roughly as
  follows:

  iface lte0 inet dhcp
  iface wlan0 inet dhcp
      wpa-ssid XXXX
      wpa-psk XXXX

  I also have defined custom options for each interface in the
  /etc/dhcp/dhclient.conf file:

  interface "lte0" {
    send host-name "hostA";
  }
  interface "wlan0" {
    send host-name "hostB";
  }

  When I do "ifup wlan0", the wrong interface is brought up:

  Listening on LPF/lte0/94:b9:b4:18:e5:ce
  Sending on   LPF/lte0/94:b9:b4:18:e5:ce
  Listening on LPF/wlan0/00:26:b6:e1:7c:64
  Sending on   LPF/wlan0/00:26:b6:e1:7c:64
  Sending on   Socket/fallback
  DHCPDISCOVER on lte0 to 255.255.255.255 port 67 interval 3 (xid=0xbb4b7c57)
  DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 3 (xid=0xbf50be57)
  DHCPREQUEST of 100.70.63.250 on lte0 to 255.255.255.255 port 67 (xid=0x577c4bbb)
  DHCPOFFER of 100.70.63.250 from 100.70.63.1
  DHCPACK of 100.70.63.250 from 100.70.63.1
  bound to 100.70.63.250 -- renewal in 270090 seconds.

  Similarly, if I do "ifdown wlan0", both interfaces are released:

  Listening on LPF/lte0/94:b9:b4:18:e5:ce
  Sending on   LPF/lte0/94:b9:b4:18:e5:ce
  Listening on LPF/wlan0/00:26:b6:e1:7c:64
  Sending on   LPF/wlan0/00:26:b6:e1:7c:64
  Sending on   Socket/fallback
  DHCPRELEASE on lte0 to 100.70.63.1 port 67 (xid=0x2f4f2125)
  DHCPRELEASE on wlan0 to 10.78.56.254 port 67 (xid=0x15a5a)

  I expect that ifup/ifdown only operates on the interface specified on
  the command line. Instead they are operating on other interfaces that
  I did not want them to touch.

  I believe the problem is related to this statement in the dhclient man page:
         It is also possible to specify interfaces by name in the dhclient.conf file.   If interfaces are  specified  in  this  way,
         then  the client will only configure interfaces that are either specified in the configuration file or on the command line,
         and will ignore all other interfaces.

  So it's reading all interfaces from the configuration file and adding
  them to the command line interfaces, and operating on all such
  interfaces. If I remove the interface stanzas from the
  /etc/dhcp/dhclient.conf file, then everything works as expected.

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