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

[Trent Lloyd]

There is not ifupdown interface for doing multiple addresses without an
alias.  Aliases do work, even with IPv6.  There is a patch in the debian
bug to support it.


However, the worst part about this bug is if you do

ifdown eth0:1


With an IPv6 stanza configured, it downs the entire interface, including IPv4.  This caused a production server outage for me and is likely to catch people out.

In my opinion that is a much more critical bug.

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

Status in “ifupdown” package in Ubuntu:
  New
Status in “ifupdown” package in Debian:
  New

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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