Comment 17 for bug 1697730

I noticed one difference between our configs was that you did not have public ipv6 set up. I shut down radvd on my router and rebooted as a test; this seems to cause a slight delay at boot (long enough for systemd to send a message warning that it's waiting for the network to be configured), but this takes about 15s before it gives up on ipv6, not 2 minutes.