Configurate a IPv6 only and IPv4 disabled networking by netplan

[Ruishuang Wang]

Hi all,

We want to set up an IPv6-only network in a lab, and some Ubuntu ( release >=18.04) needs to be configured according to the networking requirements. I found a Netplan doc about disabling ipv6 by editing the Netplan YAML file:
https://github.com/canonical/netplan/blob/main/doc/netplan-tutorial.md#editing-netplan-yaml-files-to-disable-ipv6
===
When you finish, the whole configuration in second-interface.yaml should look like this:

network:
  version: 2
  ethernets:
    enp6s0:
      dhcp4: true
      accept-ra: false
      link-local: []
===
 can I use the same way to disable IPv4? e.g.
network:
  version: 2
  ethernets:
    eth0:
      dhcp4: false
      dhcp6: true
      accept-ra: false
      link-local: [ipv6]

Or are there other ways to disable ipv4 on Ubuntu?

In addition, Ubuntu 18.04 uses ifupdown with /etc/network/interfaces to configure the networking
e.g.
===
iface lo inet loopback
auto lo

auto eth0
iface eth0 inet manual
iface eth0 inet6 dhcp
netmask 16
accept_ra 1
autoconf 1
===
Can I add 'iface eth0 inet manual' in this file to disable IPv4?
Thanks,

Thanks,

[Launchpad Janitor (janitor)]

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

[Lukas Märdian (slyon)]

Related to https://answers.launchpad.net/ubuntu/+source/netplan.io/+question/816875

[Lukas Märdian (slyon)]

I'm closing this ticket in favour of the support request (question) linked from the comment above.