[Bug 656878] Re: network interface does not come up when configured as "manual"

[rollercoaster]

no, this changed from 8.04 to 10.04 as I was trying to explain.

So what is now the intended configuration for bringing up an interface with IPv6 only? The manpage for interfaces doesn't give a hint for this case.
If it's not a bug in ifupdown, then it's a bug in the manpage not documenting this case.

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https://bugs.launchpad.net/bugs/656878

Title:
  network interface does not come up when configured as "manual"

Status in “ifupdown” package in Ubuntu:
  Won't Fix

Bug description:
  Binary package hint: ifupdown

  This affects ubuntu 10.04
  I configure a network interface as "auto" and "manual" in /etc/network/interfaces .
  But it is not "up" after a reboot. "ifconfig" does not show it in its list.
  The thing is, i only need the inet6 (link-layer) address on this interface, nothing else.

  /etc/network/interfaces:
  --- 8< ---
  auto eth0
  iface eth0 inet manual
  --- 8< ---

  if i do a "ifconfig" the interface is not listed. "dmesg | grep eth" gives me:
  [    1.161468] eth0: RTL8168b/8111b at 0xf8060000, 00:e0:f4:17:42:a0, XID 98500000 IRQ 27
  but no "link up"

  just after a manual "ifconfig eth0 up" the device is listed with
  ifconfig, has ipv6 address and dmesg says "r8169: eth0: link up"

  the manpage for interfaces says:
  "Lines beginning with the word "auto" are used to identify the physical interfaces to  be  brought up when ifup is run with the -a option." 
  There is no depency on a static address or something else. So this is a bug. The interface is not up.
  Also, this worked fine with ubuntu 8.04!!!

  as a workaround in /e/n/i i can say:
  --- 8< ---
  auto eth0
  iface eth0 inet manual
  up ifconfig eth0 up
  --- 8< ---
  but this should not be the intended method to bring an interface up, is it?
  Versions:
  ifupdown 0.6.8ubuntu29.1 (10.04.1)
  ifupdown 0.6.8ubuntu8 (8.04.4)

  maybe this is not in ifupdown but somewhere else in upstart/init .

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