[Bug 1609898] Re: dhclient incorrectly assumes a /64 ipv6 prefix

[Martin Pitt]

This was already uploaded for yakkety a while ago:
https://launchpad.net/ubuntu/+source/isc-dhcp/4.3.3-5ubuntu13.1

It is stuck in proposed (http://people.canonical.com/~ubuntu-archive
/proposed-migration/update_excuses.html#isc-dhcp) due to some
NetworkManager test regression. I retried those and will watch out for
this.

** Changed in: isc-dhcp (Ubuntu Yakkety)
       Status: In Progress => Fix Committed

** Changed in: isc-dhcp (Ubuntu Precise)
       Status: New => In Progress

** Changed in: isc-dhcp (Ubuntu Trusty)
       Status: New => In Progress

** Changed in: isc-dhcp (Ubuntu Xenial)
       Status: New => In Progress

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https://bugs.launchpad.net/bugs/1609898

Title:
  dhclient incorrectly assumes a /64 ipv6 prefix

Status in isc-dhcp package in Ubuntu:
  Fix Committed
Status in isc-dhcp source package in Precise:
  In Progress
Status in isc-dhcp source package in Trusty:
  In Progress
Status in isc-dhcp source package in Xenial:
  In Progress
Status in isc-dhcp source package in Yakkety:
  Fix Committed
Status in isc-dhcp package in Debian:
  Fix Released

Bug description:
  [Impact]

  clients who get an ipv6 address from a dhcpv6 server assume the
  address has a /64 prefix, but that is not necessarily true, and if the
  subnet is different than /64 those clients will not be able to reach
  other addresses in that /64 prefix because the other systems are not
  on-link.  This /64 assumption of dhclient effectively breaks the
  client networking for certain addresses.

  [Test Case]

  Set up a server with two interface nics, and one client connected to
  each of those interfaces.  On the server, set up a ipv6 subnet on each
  interface, with a larger prefix than /64, e.g.:

  2001:db8:0:0:1::/96
  2001:db8:0:0:2::/96

  configure dhcpv6 on the server, to provide ipv6 addresses on each
  interface.  Set the server as the default ipv6 route for the clients.

  Allow the clients to get dhcpv6 ipv6 addresses from the server.  The
  clients will each get a ipv6 address with a /64 prefix, due to the bug
  in dhclient.

  Try to ping (or otherwise communicate) between the clients.  Since
  they have /64 prefixes, they think they are on-link with each other,
  but they are not, so they can't communicate.

  After the dhclient bug is fixed, repeat the above setup, and the
  clients will get /128 prefixes instead, and then will be able to
  communicate with each other, because they will route the traffic to
  each other through the server.

  [Regression potential]

  None.  Non-standard (i.e. not /64) subnets served by dhcpv6 currently
  are broken, this fixes that.

  [Other info]

  This is fixed in debian:
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=684009

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