[Bug 1785493] Re: Netplan on-link does not work for IPv6

[Ryan Young]

Fixed in Ubuntu 20.04! You just need to add a link-scope route for your
gateway, as documented: https://netplan.io/examples/#reaching-a
-directly-connected-gateway

network:
  ethernets:
    ens3:
      dhcp4: true
      addresses: [ "2602:ff75:7:34fd::/128" ]
      routes:
        - to: "2602:ff75:7::1/128"
          scope: link
        - to: "::/0"
          via: "2602:ff75:7::1"
          on-link: true
  version: 2

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

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https://bugs.launchpad.net/bugs/1785493

Title:
  Netplan on-link does not work for IPv6

Status in netplan.io package in Ubuntu:
  Fix Released

Bug description:
  An IPv6 on-link route configuration has no effect.

  network:
      version: 2
      ethernets:
          ens3:
              addresses:
                  - fd00::1/128
              routes:
                  - to: ::/0
                    via: fd00::2
                    on-link: true

  Similar configuration for IPv4 works perfectly

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