[Bug 492650] Re: cannot configure an interface which only uses IPv6 router advertisements

[Colin Watson]

I've just uploaded ifupdown 0.7~alpha5.1ubuntu1 to Oneiric, containing
the IPv6 'auto' method.

** Changed in: ifupdown (Ubuntu)
       Status: In Progress => Fix Released

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Title:
  cannot configure an interface which only uses IPv6 router
  advertisements

Status in “ifupdown” package in Ubuntu:
  Fix Released

Bug description:
  Binary package hint: ifupdown

  I'm unable to configure an interface which has NO IPv4 address, but
  only a dynamic IPv6 address which is assigned using IPv6 router
  advertisements (using radvd or similar tools).

  /etc/network/interfaces lacks a way to define an interface as an IPv6
  only interface which uses router advertisements. If the interface has
  an IPv4 address, router advertisement for IPv6 works, without an IPv4
  address configured on the interface, it fails.

  There's no such thing as the following possible in
  /etc/network/interfaces

  iface eth0 inet6 dhcp  
  (fails as invalid command)

  The only way to fix this is by defining the interface manually:

  auto eth0
  eth0 inet6 manual

  however, this only works after running 'ifup eth0' manually, so the
  IPv6 address won't be available on the interface after a reboot even
  though 'auto eth0' has been specified, but it gives the desired
  result:

  % ip addr ls dev eth0
  2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
      link/ether 54:52:00:4c:e9:e7 brd ff:ff:ff:ff:ff:ff
      inet6 2001:7b8:3:47:5652:ff:fe4c:e9e7/64 scope global dynamic 
         valid_lft 2591979sec preferred_lft 604779sec
      inet6 fe80::5652:ff:fe4c:e9e7/64 scope link 
         valid_lft forever preferred_lft forever

  I tested this on both Jaunty and Karmic.

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