netplan ignores routes

[Olaf Seibert]

I have 2 files in /etc/netplan. One is generated by cloud-init (50-cloud-init.yaml), but it is not complete. Therefore I added a second file (60-static.yaml) to supply IPv6 address and default route. Cloud-init doesn't have this information, or ignores it (that is not the issue here).

When "netplan generate" or "netplan get" runs, it ignores the route from the second file.

Example:

# This file is generated from information provided by the datasource. Changes
# to it will not persist across an instance reboot. To disable cloud-init's
# network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
network:
    version: 2
    ethernets:
        net0:
            addresses:
            - 1.1.1.1/24 # not the real address of course
            match:
                macaddress: 11:11:11:11:11:11
            nameservers:
                addresses:
                - 8.8.8.8
                - 8.8.4.4
                search: []
            routes:
            - to: default
                via: 1.2.3.4
            set-name: net0

The other file 60-static.yaml:

network:
    version: 2
    ethernets:
        net0:
            addresses:
            - "2a02:eeee:eeee:eeee::2/64"
            routes:
            - to: "::/0"
              via: 2a02:eeee:eeee:eeee::1
              on-link: true

When getting the configuration:

$ netplan get
network:
  version: 2
  ethernets:
    net0:
      match:
        macaddress: "11:11:11:11:11:11"
      addresses:
      - "1.1.1.1/24"
      - "2a02:eeee:eeee:eeee::2/64"
      nameservers:
        addresses:
        - 8.8.8.8
        - 8.8.4.4
        search: []
      set-name: "net0"
      routes:
      - to: "default"
        via: "1.2.3.4"

The route from the second file is completely ignored.

Strangely enough, if you list multiple routes in the second file, the result does contain all of them.

[Olaf Seibert (rhialto)]

This behaviour seems new in version 0.105-0ubuntu2~22.04.3. For earlier versions there were already (other) weirdnesses in the merging of the data from multiple files, which cause me to pull out my hair.

[Danilo Egea Gondolfo (danilogondolfo)]

Hi there, thank you for your bug report.

This bug was fixed recently [1] and we will consider back-porting to Kinetic and Jammy.

On Ubuntu Lunar (netplan.io 0.106-0ubuntu2) I get this result from "netplan get" (using two separate files like you are doing):

network:
  version: 2
  ethernets:
    net0:
      match:
        macaddress: "11:11:11:11:11:11"
      addresses:
      - "1.1.1.1/24"
      - "2a02:eeee:eeee:eeee::2/64"
      nameservers:
        addresses:
        - 8.8.8.8
        - 8.8.4.4
        search: []
      set-name: "net0"
      routes:
      - to: "default"
        via: "1.2.3.4"
      - on-link: true
        to: "::/0"
        via: "2a02:eeee:eeee:eeee::1"

[1] - https://github.com/canonical/netplan/pull/320

[Lukas Märdian (slyon)]

This is fixed in 0.106, which should be backported to Jammy/Kinetic in the next couple of weeks.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.