[Bug 508996] Re: 'SIOCSIFFLAGS: Cannot assign requested address' when setting up IPv6 alias

[Thiago Martins]

Ubuntu Server 14.04 (or Debian) definitely needs a much better IPv6
support for ifupdown (or something entirely new), it is very hard to
maintain a huge IPv6-based /etc/network/interfaces files these days...
Basically, no IPv6 Alias or VLANs support for ifupdown...      :-(

I'm trying to install Ubuntu Server 14.04 (or 12.04) in a IPv6-Only
network and it is a pain (Ubuntu Desktop, Windows and Mac works okay)...

IPv6 management is very easy when with Ubuntu Desktop but, when with
Server, it needs much more work to become more admin-friendly.     =)

I know that you can have everything of your IPv6 network up and running
using "up ip -6 addr add xxxx/64 dev $IFACE and etc" but, it kills the
purpose of the /etc/network/interfaces file (if you use it just like a
Bash script)...

Long life for Ubuntu / Debian! Lets move to a IPv6-Only-World guys!!
IPv4 is a thing of the past...    =P

Best,
Thiago

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https://bugs.launchpad.net/bugs/508996

Title:
  'SIOCSIFFLAGS: Cannot assign requested address' when setting up IPv6
  alias

Status in “ifupdown” package in Ubuntu:
  Fix Released
Status in “ifupdown” source package in Precise:
  Triaged
Status in “ifupdown” package in Debian:
  Fix Released

Bug description:
  Binary package hint: ifupdown

  This is very similar to Bug #123773, but is specific to IPv6 and
  should probably be tracked separately.

  I don't have an instance ready to retest on, but this apparently
  worked on Jaunty (9.04) and broke on Karmic (9.10).  I'm actually re-
  using the "/etc/network/interfaces" file that I used successfully
  under Jaunty before upgrading to Karmic.

  Per the IFCONFIG(8) man page, I'm attempting to define an IP alias in
  /etc/network/interfaces:

  auto eth0
  iface eth0 inet static
          address 192.168.1.1
          netmask 255.255.255.0

  auto eth0:0
  iface eth0:0 inet6 static
          address 2001:db8::1
          netmask 64

  (2001:db8::1 is only an example address.)

  Attempting to perform an "ifup eth0:0" results in:

  SIOCSIFFLAGS: Cannot assign requested address
  Failed to bring up eth0:0.

  Unlike Bug #123773, this is not coming from the wireless-tools or
  other event scripts, as disabling them does not change the result.

  The following command is a work-around, and works as a post-up command in /etc/network/interfaces:
  ip addr add 2001:db8::1/64 dev eth0

  Defining an IPv4 alias also works correctly using either the alias
  stanza or the "ip addr add" command.

  uname: Linux 2.6.31-17-generic #54-Ubuntu SMP Thu Dec 10 17:01:44 UTC 2009 x86_64 GNU/Linux
  ifupdown package version is 0.6.8ubuntu21

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