Better to have that piece of work done locally by all the endpoints and have them send a light information stream to the center: a single map coordinate rather than a bunch of tower coordinates and distance measurements.

FORBES: The Case For Endpoints

However, ISPs have so widely deployed network address translation (NAT) devices, which coordinate multiple intranet addresses through a single Internet address, that they're in no hurry to move to IPv6.

CNN: New protocol sneaks IPv6 traffic over the 'Net