Was able to reproduce, my workaround was a systemd timer to clear the dhcp lease files and restart networkmanager... which is rather violent.
Confirmed client side problem, Win7,Win10,MacOS Montemery and Android 11 have no problems and do not lose their ipv6 on the same network. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1969901 Title: network-manager fails to renew ipv6 address To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1969901/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs