[Bug 1171914] Re: disable_ipv6 value in /etc/sysctl.conf not set at boot time

[Brian Murray]

** Tags added: raring

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Title:
  disable_ipv6 value in /etc/sysctl.conf not set at boot time

Status in “procps” package in Ubuntu:
  New

Bug description:
  (The following seems to impact Raring, which I believe is a regression
  from Precise where the following setup did successfully disable ipv6).

  I have attempted to disable ipv6 by adding a bunch of configuration
  flags to the bottom of /etc/sysctl.conf:

      # tail -n 4 /etc/sysctl.conf
      net.ipv6.conf.all.disable_ipv6 = 1
      net.ipv6.conf.default.disable_ipv6 = 1
      net.ipv6.conf.lo.disable_ipv6 = 1
      net.ipv6.conf.eth0.disable_ipv6 = 1

  However from a fresh reboot ipv6 is *enabled* on eth0.  Perhaps this
  is because it is trying to be set before that interface has come up.
  But then shouldn't the all interface cover it?  We can see the values
  currently set:

      # for i in /proc/sys/net/ipv6/conf/*/disable_ipv6; do echo -n "$i: " ; cat $i; done
      /proc/sys/net/ipv6/conf/all/disable_ipv6: 1
      /proc/sys/net/ipv6/conf/default/disable_ipv6: 1
      /proc/sys/net/ipv6/conf/eth0/disable_ipv6: 0
      /proc/sys/net/ipv6/conf/lo/disable_ipv6: 1

  Starting up procps again does set the configuration to what I would
  have expected:

      # service procps start
      procps stop/waiting
      # for i in /proc/sys/net/ipv6/conf/*/disable_ipv6; do echo -n "$i: " ; cat $i; done
      /proc/sys/net/ipv6/conf/all/disable_ipv6: 1
      /proc/sys/net/ipv6/conf/default/disable_ipv6: 1
      /proc/sys/net/ipv6/conf/eth0/disable_ipv6: 1
      /proc/sys/net/ipv6/conf/lo/disable_ipv6: 1

  How can I disable ipv6 at bootup time?

  ----

  # uname -a
  Linux salinas 3.8.0-19-generic #29-Ubuntu SMP Wed Apr 17 18:16:28 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

  # lsb_release -rd
  Description:	Ubuntu 13.04
  Release:	13.04

  # apt-cache policy procps
  procps:
    Installed: 1:3.3.3-2ubuntu5
    Candidate: 1:3.3.3-2ubuntu5
    Version table:
   *** 1:3.3.3-2ubuntu5 0
          500 http://mirror.anl.gov/pub/ubuntu/ raring/main amd64 Packages
          100 /var/lib/dpkg/status

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