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[Marcel Nageler <launchpad@xxxxxxxxxxx>]

This bug is due to a failure in handling router advertisments.

According to RFC 4861 (page 20) a _Cur Hop Limit_ set to 0  means, that
the Hop Limit is unspecified. Ubuntu 15.04 takes this literally and sets
HL to 0.

Fortunately my router provided the option to set this field to a manual
value, altough i suppose this is not the case for most routers.

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https://bugs.launchpad.net/bugs/1450066

Title:
  IPv6 hop limit set to 0

Status in network-manager package in Ubuntu:
  Triaged
Status in network-manager source package in Vivid:
  Triaged

Bug description:
  On upgrading from Ubuntu 14.10 to 15.04 I found that my IPv6
  networking no longer worked. It turned out that this was because my
  hop limit was set to zero:

  # sysctl -a | fgrep eth0.hop_limit
  net.ipv6.conf.eth0.hop_limit = 0

  which in turn seems to have been cause by a known problem in the
  network manager:

  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=756534
  https://bugzilla.gnome.org/show_bug.cgi?id=737252

  Since this has already been fixed in the GNOME project, can Ubuntu
  15.04 please take the upstream fix?

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