There is a private (RFC-1918) network at Primary. Every machine, in addition to its public interface, has a 192.168.1.xxx/24 interface. The last octet of the private address corresponds to the last octet of the public address. We currently use this network for backups only. It is possible that at some point, we might want to use this network for NFS traffic.
In hosts files, the private interfaces are named "-be", for "back-end". Thus, bud's private interface is reachable via 'bud-be', or 192.168.1.162. Budlight has 'budlight-be' at 192.168.1.163, and back has 'bock-be' at 192.168.1.167.