Notes on Centos Network Install

Path to the install source must go down to the arch e.g.:

http://mirror.internode.on.net/pub/centos/7/os/x86_84

The network interface much be enabled before the installer can set up the base repository.
The problem is the network config button is after the installer source button, so it is logical to try and set up the repo first.
However that won't work, instead you'll get a "error setting up base repository" warning/error.
So go to the network settings first and turn an interface on.