enabling the guest network to airprint to internal printers
20190528 - update as of the latest stable release (4.0.42.10433) the steps described here are no longer applicable. further, the desired behavior does appear to be supported out of the box. this information should be considered historical in nature. overview by default the ubiquity APs have a number of rules in place that prevent airprint and bonjour operation from working together nicely. the following is necessary to enable guest networks to reach airprint, etc....