It is true and that's probably the most unclear part of the original blog. I think the author has given some kind of advice -- use a vnet based on host-bridge -- not sure why he just commented out from the script. In my understanding, if I am working on a laptop, I can just set SNAT rules which allow traffic from a private network to go out to the internet. Given that the number of connection won't be large (no more than 400 connections, or 500, a usual number of open file for one process), it is acceptable that the new connections can wait until a period of time.