[Bug 1832404] Re: sit tunnel should not require the local param

[Mathieu Trudel-Lapierre]

** Package changed: plan (Ubuntu) => netplan.io (Ubuntu)

** Changed in: netplan.io (Ubuntu)
   Importance: Undecided => Medium

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

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https://bugs.launchpad.net/bugs/1832404

Title:
  sit tunnel should not require the local param

Status in netplan.io package in Ubuntu:
  Confirmed

Bug description:
  [Description]

  When setting up a sit tunnel (with Hurricane Electric for example),
  one can use a netplan config like (https://netplan.io/examples
  #connecting-an-ip-tunnel) this:

  network:
    version: 2
    ethernets:
      eth0:
        addresses:
          - 1.1.1.1/24
          - "2001:cafe:face::1/64"
        gateway4: 1.1.1.254
    tunnels:
      he-ipv6:
        mode: sit
        remote: 2.2.2.2
        local: 1.1.1.1
        addresses:
          - "2001:dead:beef::2/64
        gateway6: "2001:dead:beef::1"

  This works well with a static IPv4 on eth0. Had eth0 been configured
  by DHCP one would be tempted to omit the 'local' param and let the
  network stack figure out which one to use to reach the remote
  endpoint. This used to work that way with ifupdown but netplan
  complains:

    Error in network definition: he-ipv6: missing 'local' property for tunnel
        mode: sit
        ^

  
  [Additional information]
  # lsb_release -rd
  Description:	Ubuntu 18.04.2 LTS
  Release:	18.04
  # apt-cache policy netplan.io
  netplan.io:
    Installed: 0.97-0ubuntu1~18.04.1
    Candidate: 0.97-0ubuntu1~18.04.1
    Version table:
   *** 0.97-0ubuntu1~18.04.1 500
          500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       0.40.1~18.04.4 500
          500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
       0.36.1 500
          500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: netplan (not installed)
  ProcVersionSignature: Ubuntu 4.15.0-51.55-generic 4.15.18
  Uname: Linux 4.15.0-51-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.9-0ubuntu7.6
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Jun 11 16:26:25 2019
  InstallationDate: Installed on 2018-07-15 (331 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180714)
  ProcEnviron:
   LANG=en_CA.UTF-8
   TERM=xterm-256color
   SHELL=/bin/bash
   XDG_RUNTIME_DIR=<set>
   PATH=(custom, no user)
  SourcePackage: plan
  UpgradeStatus: No upgrade log present (probably fresh install)

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