On Wed, 25 Jan 2012, Dale W. Carder wrote:
We have one customer in particular with a substantial non-publicly reachable v6 deployment with globally assigned addresses. I believe there is no need to replicate the headaches of rfc1918 in the next address-family eternity.
The one big issue I could see with doing that is that the vulnerability exposure, particularly from the outside world, is larger if devices that don't need public addresses have them. For example, if a network engineer or NOC person accidentally removes a "hide my public infrastructure from the outside world" from an interface on a border router... As others have mentioned, things like management interfaces on access switches, printers, and IP phones would be good candidates to hide with ULA. jms