OK, I have it working for me using my ipv6 test bench (https://github.com/daxtens/ipv6-config-demos)
Systemd-networkd: root@slaac-rdnss-networkd:~# ip a list temporary root@slaac-rdnss-networkd:~# sudo nano /etc/netplan/60-ipv6.yaml # add ip6-privacy: true root@slaac-rdnss-networkd:~# sudo netplan apply root@slaac-rdnss-networkd:~# ip a list temporary 113: eth0@if114: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000 link/ether 00:16:3e:6c:32:b7 brd ff:ff:ff:ff:ff:ff link-netnsid 0 inet6 fd8f:1d7d:b142:0:c9f6:a048:7d3d:d7b0/64 scope global temporary dynamic valid_lft 86399sec preferred_lft 14399sec NetworkManager: root@slaac-rdnss-network-manager:~# ip a list temporary root@slaac-rdnss-network-manager:~# nano /etc/netplan/60-ipv6.yaml root@slaac-rdnss-network-manager:~# sudo netplan apply # add ip6-privacy: true # wait a couple of secs root@slaac-rdnss-network-manager:~# ip a list temporary 69: eth0@if70: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000 link/ether 00:16:3e:be:4c:e9 brd ff:ff:ff:ff:ff:ff link-netnsid 0 inet6 fd8f:1d7d:b142:0:55c8:3d0f:558d:2f20/64 scope global temporary dynamic valid_lft 86392sec preferred_lft 14392sec The package is in the same ppa at version 0.39+dja2.2, and I'll submit a PR shortly. Regards, Daniel -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1750392 Title: nplan cannot enable IPv6 privacy extensions To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nplan/+bug/1750392/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs