[Bug 1664352] Re: dhclient-script doesn't use configured metric for rfc3442 classless routes

[Matt Heller]

Is there something I can do to help make some progress fixing this bug?
This issue is not applicable to the upstream software source however I
did notice that it is relevant to Debian's isc-dhcp-client package which
I believe is in a sense "upstream" for the Ubuntu package. In light of
that should I pursue fixing the Debian package first?
(https://wiki.ubuntu.com/Debian/Bugs)

--Matt

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https://bugs.launchpad.net/bugs/1664352

Title:
  dhclient-script doesn't use configured metric for rfc3442 classless
  routes

Status in isc-dhcp package in Ubuntu:
  Confirmed

Bug description:
  lsb_release -rd
  Description:	Ubuntu 16.04.2 LTS
  Release:	16.04
  apt-cache policy isc-dhcp-client
  isc-dhcp-client:
    Installed: 4.3.3-5ubuntu12.6
    Candidate: 4.3.3-5ubuntu12.6
    Version table:
   *** 4.3.3-5ubuntu12.6 500
          500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       4.3.3-5ubuntu12 500
          500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages

  If the metric option is set in interfaces(5), dhclient is executed
  with the variable IF_METRIC set to the configured administrative
  metric. The exit-hook rfc3442-classless-routes doesn't use the
  variable; thus, a multi-interface box will experience a race condition
  if multiple interfaces are supplied with one or more duplicate rfc3442
  routes. The attached patch adds support for IF_METRIC handling.

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