Comment 5 for bug 1766542

The default time out now is:

- 120s * #ip-addresses before bionic
- 120s + 250ms * #ip-addresses for bionic

That's a substantial improvement. I still think we should lower the timeout from 120s to 20s for cosmic, bringing this down to 20s + 250ms * #ipaddr (if we estimate up to 4 ip addresses, it will succeed or fail within 21s).

I'd be open to backporting happy-eyeballs to xenial too, once it has spent some more time in bionic. The changes are local to a single file (methods/connect.cc), but they are quite big relative to that file, so we should be careful.