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[Tessa Lau <tlau@xxxxxxxx>]

Public bug reported:

I have a server with multiple internet connections using several
different network interfaces (e.g. wlan0 for wireless and lte0 for an
LTE dongle). Both are configured in /etc/network/interfaces to use DHCP
like so:

allow-hotplug lte0
iface lte0 inet dhcp

iface wlan0 inet dhcp
    wpa-ssid MY_NETWORK
    wpa-psk XXXX
    wpa-driver nl80211
    wpa-key-mgmt WPA-PSK

If both interfaces are up and I try to bring just one of them down using
"ifdown wlan0" I would expect the other interface to remain up. However,
this actually brings down both interfaces and does a DHCP release on
both.

% sudo ifdown wlan0
Internet Systems Consortium DHCP Client 4.2.4
Copyright 2004-2012 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/lte0/94:b9:b4:0a:c6:e0
Sending on   LPF/lte0/94:b9:b4:0a:c6:e0
Listening on LPF/wlan0/80:86:f2:b1:c3:3f
Sending on   LPF/wlan0/80:86:f2:b1:c3:3f
Sending on   Socket/fallback
DHCPRELEASE on lte0 to 100.79.128.1 port 67 (xid=0x33b5bd5b)
Connection closed.

This is actually catastrophic for us since we are connecting to the
server via the lte0 interface, and we have just shut down our access
route to the server.

This seems like a bug in ifdown, where it is bringing down the wrong
interface despite what I told it to do on the command line.

** Affects: ifupdown (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1442837

Title:
  "ifdown wlan0" brings down multiple interfaces, not just the specified
  one

Status in ifupdown package in Ubuntu:
  New

Bug description:
  I have a server with multiple internet connections using several
  different network interfaces (e.g. wlan0 for wireless and lte0 for an
  LTE dongle). Both are configured in /etc/network/interfaces to use
  DHCP like so:

  allow-hotplug lte0
  iface lte0 inet dhcp

  iface wlan0 inet dhcp
      wpa-ssid MY_NETWORK
      wpa-psk XXXX
      wpa-driver nl80211
      wpa-key-mgmt WPA-PSK

  If both interfaces are up and I try to bring just one of them down
  using "ifdown wlan0" I would expect the other interface to remain up.
  However, this actually brings down both interfaces and does a DHCP
  release on both.

  % sudo ifdown wlan0
  Internet Systems Consortium DHCP Client 4.2.4
  Copyright 2004-2012 Internet Systems Consortium.
  All rights reserved.
  For info, please visit https://www.isc.org/software/dhcp/

  Listening on LPF/lte0/94:b9:b4:0a:c6:e0
  Sending on   LPF/lte0/94:b9:b4:0a:c6:e0
  Listening on LPF/wlan0/80:86:f2:b1:c3:3f
  Sending on   LPF/wlan0/80:86:f2:b1:c3:3f
  Sending on   Socket/fallback
  DHCPRELEASE on lte0 to 100.79.128.1 port 67 (xid=0x33b5bd5b)
  Connection closed.

  This is actually catastrophic for us since we are connecting to the
  server via the lte0 interface, and we have just shut down our access
  route to the server.

  This seems like a bug in ifdown, where it is bringing down the wrong
  interface despite what I told it to do on the command line.

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