--- randy@psg.com wrote: lots of good research lit on catchment topology of anycasted dns, which is very non-local. ----------------------------------- For the others here that didn't know what that is and are curious. I couldn't take it and just had to know... :) https://tools.ietf.org/html/rfc4786 Catchment: in physical geography, an area drained by a river, also known as a drainage basin. By analogy, as used in this document, the topological region of a network within which packets directed at an Anycast Address are routed to one particular node. scott