On Sun, May 06, 2012 at 04:30:02PM -0500, Karanbir Singh wrote: > Does that then imply that machines which do have an AAAA will not be > used / served for A records ? ( or tested for that matter ) There are 2 components: 1) URLs handed to end users. These are simply URLs, the client (yum, browser for download links, ...) does its own address resolution and decision as to which IPv[46] address to use. 2) The MM crawler. It does its own address resolution (via urlgrabber), and doesn't try both IPv4 and IPv6 if both types of records are available. -- Matt Domsch Technology Strategist Dell | Office of the CTO