On Feb 21, 2013, at 8:34 PM, Michael Thomas <m...@mtcc.com> wrote: > Sigh all you like, but I share Dave's skepticism that ISP's renumbering my > prefix > willy-nilly and it just sort of works with naming -- including addresses > squirrelled > away in places they ought not be -- is going to work any time soon. I don't > like to > think that NAT is inevitable but frankly the people in this working group > don't get > to vote on that.
It's probably also worth mentioning that in general ISPs that do this on a regular basis are attacking their customer's network, and the resulting instability is not the result of a failing on our part, but deliberate action on the part of the ISP. There are countries where ISPs are required by law to _offer_ a change of address every 24 hours for privacy purposes. At least in the cases I'm aware of, ISPs don't _force_ this on their customers, but rather it's a configuration option paranoid customers can choose, which may default to on. This is an inconvenience to ISPs, because it causes address pool churn, and requires a lot of extra bits to be allocated to PE devices to accommodate all the deprecated addresses. Pretty much by definition, if you want to access your washing machine while away from home, you're throwing that particular sort of privacy right out the window. It wasn't buying you much anyway--fuzzing the prefix by a few bits is very easy to reverse, and because of routing hierarchies, IPv6 prefixes can't be assigned to the customer out of the ISP's entire address space--by definition they will be restricted to localities. The other use case for frequent renumbering is an ISP who wants to prevent the customer from setting up servers. The washing machine is a server. Either the ISP succeeds, or fails, but in either case, they are acting directly against the customer's wishes. We can try to design a system that's robust with respect to attacks like this, but in practice the best way to address this problem is to prevent it happening on a regular basis to people who will care about it. _______________________________________________ homenet mailing list homenet@ietf.org https://www.ietf.org/mailman/listinfo/homenet
