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

[Matt Heller]

In my environment we have some dual-homed Ubuntu hosts that have one
network interface with a WAN IP and one on a private network. For proper
network connectivity we need to use the configurable metric value to
prioritize the default route provided by the WAN connected interface
over the default route (a NAT gateway) provided by the private network
DHCP server. Unfortunately the current dhclient script ignores the
configured metric when adding DHCP provided rfc3442 classless routes to
the routing table. This patch from Tom fixes dhclient behavior for my
use case.

--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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