[Bug 1786726] Re: dns-search rendered for ipv4 when no addresses configured

[Launchpad Bug Tracker]

This bug was fixed in the package netplan.io - 0.40.1~18.04.3

---------------
netplan.io (0.40.1~18.04.3) bionic; urgency=medium

  * Fix idempotency in renaming: bond members should be exempt from rename, as
    they may all share a single MAC for the bond device. (LP: #1802322)
  * tests/integration.py: add test designed to catch the above regression.

netplan.io (0.40.1~18.04.2) bionic; urgency=medium

  * Fix typo breaking rename on 'netplan apply'. (LP: #1770082)

netplan.io (0.40.1~18.04.1) bionic; urgency=medium

  * Backport netplan 0.40.1 to 18.04. (LP: #1793309)

netplan.io (0.40.1) cosmic; urgency=medium

  * tests/generate.py: use random.sample() instead of random.choices() to
    better support older pythons.
  * Deal gracefully with empty files on 'netplan apply' (LP: #1795343)

netplan.io (0.40) cosmic; urgency=medium

  * New upstream release:
    - networkd: route source is PreferredSource= not From=
    - Improve NetworkManager error reporting on unrenderable routes.
    - Don't render ipv4 dns-search unless we have an ipv4 address.
      (LP: #1786726)
    - Set permissive umask on networkd .network, .link and .netdev files
      (LP: #1736965, LP: #1768560)
    - Fix support for link-scope routes. (LP: #1747455)
    - Update man pages for deletion of replug code.
    - Spell Gratuitous ARP correctly and make it work. (LP: #1756701)
    - Many typo fixes for documentation. (LP: #1783940)
    - Various build system fixes.
    - Fix integration tests:
      - iproute2 output changes for link-scope routes
      - fix stability of networkd igmp-resend test
      - fix manual_addresses test now that networkd lists ~. domain
    - Deduplicate code for parsing interface options
    - Add support for optional-addresses.

netplan.io (0.39) cosmic; urgency=medium

  * New upstream release:
    - Allow link-local addresses to be configured. (LP: #1771704)
    - Forces bridges with no addresses to be brought online. (LP: #1736975)

netplan.io (0.38) cosmic; urgency=medium

  * New upstream release:
    - Write udev .rules files to /run/udev/rules.d to enforce interface
      renaming. (LP: #1770082)
    - Don't traceback for 'netplan ip leases' when iface is not managed or
      doesn't DHCP (LP: #1768823)
    - Fix duplicate "/" path separator in error messages (LP: #1771440)
    - Fix incorrect terminal reset in 'netplan try' on Ctrl-C. (LP: #1768798)
    - Updated doc entries: mtu, fix fwmark->mark, cleanup optional.
      (LP: #1768783)
    - Added documentation validation at build.
    - Added configuration example for multi-ip interfaces.
  * tests/integration.py: fix test_eth_and_bridge autopkg test harder.
  * debian/control:
    - Add iproute2 to Depends.
    - Add python3-netifaces to Depends, Build-Depends.

 -- Mathieu Trudel-Lapierre <cyphermox at ubuntu.com>  Wed, 21 Nov 2018
14:42:59 -0500

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

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https://bugs.launchpad.net/bugs/1786726

Title:
  dns-search rendered for ipv4 when no addresses configured

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

Bug description:
  [Impact]
  Users configuring IPv6 static address with NetworkManager as a backend.

  [Test cases]
  1) Configure netplan for static addresses for IPv6, dns settings, but no IPv4 configuration:

      [...]
      ens8:
        accept-ra: false
        addresses: ['23:b0:87:58:65:f7:fb:8b/45', '63:94:73:e1:46:15:79:58/50']
        nameservers:
          addresses: ['f2:9d:bc:04:7b:87:ec:28']
          search: [lab, home]
        renderer: NetworkManager

  2) Verify that no IPv4 configuration was added in NetworkManager:

    'nmcli'

  3) Verify that warnings aren't in /var/log/syslog about invalid
  properties.

  
  [Regression potential]
  Possible regressions might include issues with setting DNS search domains or addresses for the nameservers. Any issues related to resolving addresses on such an IPv6 network, where the nameserver or search domains are incorrectly added.

  ---

  In an IPv6 static setup with NetworkManager, such as the following:

      ens8:
        accept-ra: false
        addresses: ['23:b0:87:58:65:f7:fb:8b/45', '63:94:73:e1:46:15:79:58/50']
        nameservers:
          addresses: ['f2:9d:bc:04:7b:87:ec:28']
          search: [lab, home]
        renderer: NetworkManager

  we see the following error in syslog:

  NetworkManager[19666]: <warn>  [1532665946.1502] keyfile: error loading connection from file /run/NetworkManager/system-connections/net
  plan-ens8: invalid connection: ipv4.dns-search: this property is not allowed for 'method=link-local'

  netplan renders an ipv4 dns search property, even though there is no
  configured ipv4 address. NetworkManager doesn't like this and it
  prevents the connection from being configured.

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