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[LaMont Jones <lamont.jones@xxxxxxxxxxxxx>]

Public bug reported:

The lxc postinst assumes that only /24 networks are used in 10.0.0.0/8.
If the host has a route for 10.0.0.2/23 (or 10.0.0.0/22, or any other
block that includes 10.0.3.0/24 or whatever other block it is checking)
then the postinst chooses a chunk of the existing network block,
breaking connectivity.

Preparing to unpack .../lxc_1.0.5-0ubuntu0.1_amd64.deb ...
Unpacking lxc (1.0.5-0ubuntu0.1) ...
Processing triggers for ureadahead (0.100.0-16) ...
ureadahead will be reprofiled on next reboot
Processing triggers for man-db (2.6.7.1-1) ...
Setting up lxc (1.0.5-0ubuntu0.1) ...
lxc start/running
Setting up lxc dnsmasq configuration.
Processing triggers for ureadahead (0.100.0-16) ...
On branch master
nothing to commit, working directory clean
-soko(root) 308 : netstat -rn | grep ^10.0..\.
10.0.2.0        10.172.64.1     255.255.254.0   UG        0 0          0 tun0
10.0.3.0        0.0.0.0         255.255.255.0   U         0 0          0 lxcbr0

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

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https://bugs.launchpad.net/bugs/1358306

Title:
  lxc postinst incorrectly chooses network address to use

Status in “lxc” package in Ubuntu:
  New

Bug description:
  The lxc postinst assumes that only /24 networks are used in
  10.0.0.0/8.  If the host has a route for 10.0.0.2/23 (or 10.0.0.0/22,
  or any other block that includes 10.0.3.0/24 or whatever other block
  it is checking) then the postinst chooses a chunk of the existing
  network block, breaking connectivity.

  Preparing to unpack .../lxc_1.0.5-0ubuntu0.1_amd64.deb ...
  Unpacking lxc (1.0.5-0ubuntu0.1) ...
  Processing triggers for ureadahead (0.100.0-16) ...
  ureadahead will be reprofiled on next reboot
  Processing triggers for man-db (2.6.7.1-1) ...
  Setting up lxc (1.0.5-0ubuntu0.1) ...
  lxc start/running
  Setting up lxc dnsmasq configuration.
  Processing triggers for ureadahead (0.100.0-16) ...
  On branch master
  nothing to commit, working directory clean
  -soko(root) 308 : netstat -rn | grep ^10.0..\.
  10.0.2.0        10.172.64.1     255.255.254.0   UG        0 0          0 tun0
  10.0.3.0        0.0.0.0         255.255.255.0   U         0 0          0 lxcbr0

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