> > 3) When I connect my IPV6 refrigerator with its automatic inventory > > system tracking every RFID-enabled carrot I use, won't I be making > > my > > shopping habits visible to all those annoying advertisers? Or, in > > other words, am I compromising my privacy? Actually, although such > > dissemination of information can be blocked by a correctly designed > > firewall, I suspect the "Free IPv6 DSL Modem and Router, Sponsored > > by > > <your-favorite-commercial-site>" that comes with your ISP contract, > > would err on the side of promiscuity > Set your refrigerator to fe80:0001:: and it's now only accessible on > the local subnet. > Quoting http://www.litech.org/~jeff/private/ipv6primer/html/ > Two prefixes are set aside for link-local and site-local addresses. site-local addresses are officially deprecated. If you want a device to only be available locally - block the traffic to/from that device. Or block if from acquiring a public address and leave it as link-local only [most people will, I think, just choose the first options - like they do now when they want to block a device].