Comment 1 for bug 1751379

Upgrading from Ubuntu 17.10 to 18.04 appears to have fixed the problem with the vti interfaces disappearing from the output of ip addr during a network glitch.

However, I still see a failure of the vti interfaces to come up automatically at boot without manually running systemctl start ipsec, and I still find that after a temporary network glitch, the tunnels do not promptly resume passing traffic.