[Bug 1724666] Re: source-based routing

[Mathieu Trudel-Lapierre]

This has been fixed upstream and in ubuntu 18.04:

netplan.io (0.34) bionic; urgency=medium

  * New release 0.34 (LP: #1754019):
    * Implement "optional: true" to correctly write systemd network definitions
      with "RequiredForOnline=false", so that these networks do not block boot.
      (LP: #1664844)
    * Implement 'help' as a subcommand of any netplan command, so that running
      'netplan * help' always returns some helpful information. (LP: #1748629)
    * Reinstate snap support for dealing with the NetworkManager snap.
      (LP: #1747714)
    * Added bash completion. (LP: #1749869)
    * Implement 'netplan ip leases': allows users to retrieve lease information
      for the backend in use; to query for custom DHCP options.
    * Don't silently break bridge-priority; fix it instead. (LP: #1752162)
    * Miscellaneous coverage, linting, and fuzzing fixes.
    * Refactor subcommands into separate source files, automate command loading
      and various code cleanups.
    * Disable "ifupdown-migrate"; which is incomplete and thus risks breaking
      systems. Better iterate over it without showing it as a viable option.
    * Add better routing support, implement initial routing policy support.
      - Add 'on-link' support. (LP: #1735193)
  * debian/control:
    - Renamed source and "real" binary to netplan.io.
    - Added a transitional package for nplan.
    - Updated Vcs-* fields to point to the Github project we now use.
    - Updated Standards-Version, debhelper.
  * debian/compat: bump to debhelper compat level 11.
  * debian/copyright: Update Format: field for https.
  * debian/netplan.io.install: obligatory file to install files.
  * debian/source/format: now we're 3.0 native, for reals.


Policy-routing is available, for the most part; and at least to fully support the example provided in the original description.

** Changed in: netplan
       Status: New => Fix Released

** Also affects: netplan.io (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: netplan.io (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1724666

Title:
  source-based routing

Status in netplan:
  Fix Released
Status in netplan.io package in Ubuntu:
  Fix Released

Bug description:
  Currently use a short script in if-up.d as follows:

  #!/bin/sh
  set -e
  if [ "$METHOD" = loopback ]; then
      exit 0
  elif [ "$METHOD" = dhcp ]; then
      exit 0
  elif [ "$METHOD" = static ]; then
      if [ "$IF_GATEWAY" ]; then
  echo "exiting..."
          exit 0
      fi
  fi
  IF_GATEWAY="$(echo "$IF_ADDRESS" | cut -d. -f1-3).254"
  ip route flush table "$IFACE"
  ip route add default via "$IF_GATEWAY" table "$IFACE"
  ip rule del lookup "$IFACE" || true
  ip rule add from "$IF_ADDRESS" lookup "$IFACE"

  
  Basically, if the interface is a loopback, dhcp, or already has a default gateway, it does nothing.  For any other interface, it adds a default route to the route table causing all responses to inbound traffic to use the same interface to respond on.  This is for use in multi-homed environments.  All I have seen in netplan is to add a static route which ends up in the default routing table.  Obviously that won't work in multi-homed, as you would end up with multiple default routes and asymmetric routing.

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