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[Ouroborus <deadchicken@xxxxxxxxx>]

I have a similar situation (at least it fits the title). I have two
wired NICs, one configured for static (10GbE) and the other configured
for DHCP (1GbE). Only the DHCP-configured NIC ever has internet access.
It seems that no matter how I arrange things, NetworkManager sets the
default route to be the internet-less, static-configured NIC.

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https://bugs.launchpad.net/bugs/979067

Title:
  NM fails to configure routing correctly when connect to two LANs

Status in dnsmasq package in Ubuntu:
  Invalid
Status in network-manager package in Ubuntu:
  Confirmed

Bug description:
  My computer happens to be connected to two networks through eth0 and
  wlan0. NetworkManager connects to both of them automatically and use
  DHCP for both of them. Both networks are protected from the outside by
  firewalls and they are lots of DNS servers (obtained automatically).
  Since the upgrade to Precise, DNS no longer works without manual
  intervention.

  What happens is that, since bug #903854, dnsmasq no longer receives
  the option --strict-order. As a consequence, it tries servers in a
  random order to resolve DNS requests. In particular, it tries to
  access DNS servers from the wireless network through the eth0 route,
  which crosses a firewall, and therefore it fails to resolve requests.
  It takes a lot of failures before all the unreachable servers have
  been exhausted, which makes for a poor user experience.

  With the --strict-order option, dnsmasq tries to access servers that
  can be accessed by the default route, which succeeds immediately. Note
  that I am not sure that --strict-order is the proper fix and it may
  only be papering over a real bug, but at least it does fix the issue.

  network-manager: 0.9.4.0-0ubuntu2
  dnsmasq-base: 2.59-4

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