[Bug 1580734] Re: IPv4 configuration fails in installer when IPv6 auto configuration succeeds

[Andreas Ott]

** Package changed: ubuntu => debian-installer (Ubuntu)

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https://bugs.launchpad.net/bugs/1580734

Title:
  IPv4 configuration fails in installer when IPv6 auto configuration
  succeeds

Status in debian-installer package in Ubuntu:
  Confirmed

Bug description:
  Ubuntu 16.04 LTS amd64 server install ISO

  Expected:
  Installer should prompt for IPv4 network config to be entered manually if IPv4 auto configuration fails, even if IPv6 auto configuration succeeded. This should be dual-stack, operating independently from each other.

  What happened instead:
  Server is IPv6 only after reboot, even when IPc4 network settings were entered manually during install

  
  I am trying to install a server VM on a dual-stack network segment that has no IPv4 auto configuration (no DHCP) but has IPv6 router advertisements (IPv6 auto-assignment works). IPv4 addresses must be assigned manually on this segment.

  The installer will do automatic network configuration with IPv4
  failing, and IPv6 succeeding, then stop at the point to ask for DNS
  server IP(s). DNS information is not supplied through IPv6 mechanism
  of self-assigning an IP address. I can use "Go back" and manually
  configure IPv4 settings, and they are retained for the install
  process, but are not permanently written to /etc/network/interfaces .
  After reboot, the server is IPv6 only, minus working DNS server
  settings.

  
  Additional info:
  The network configuration works if I install on a network segment that has no IPv4 and no IPv6 automatic configuration, in this case the installer shows that all auto configuration failed and asks for all network configuration to be entered manually.

  The network configuration works if I install on a network segment that
  has IPv4 DHCP to provide network auto configuration (with or without
  IPv6).

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