What is Dynamic Discovery?
eduroam has traditionally used a hierarchy of RADIUS servers. All national roaming authentication traffic was aggregated into a national proxy server; all international roaming traffic was aggregated into a set of international proxy servers.
While this works quite well under most circumstances, there are some drawbacks in efficiency, and a rather unpleasant inflexibility when it comes to routing realms which do not fit into the national aggregations model because they do not use the national .TLD ending of their federation (e.g. realms in ".net", ".org", etc.).
Dynamic Discovery places routing hints towards the responsible authentication server or national proxy into DNS, making routing more efficient.
As an IdP, you do not have to know much about the mechanics behind this - the only required step to make your realm dynamically discoverable is by adding a single resource record into your domain's DNS zone.Why Dynamic Discovery?