On Oct 5, 2011, at 7:37 AM, Weil, Jason wrote: > On 10/4/11 7:17 PM, "james woodyatt" <[email protected]> wrote: >> >> Utility networks of that sort do not provide transit to the Internet >> default-free zone. They must therefore obtain their routes to >> residential networks bilaterally. This implies that these utility >> networks could be-- and would do well to be-- numbered with ULA prefixes, >> and that they should use of an exterior gateway protocol at their border >> with residential networks so that each home network can advertise, into >> the utility network, its list of globally assigned prefixes that it >> obtains from Real Internet Service Providers. > > [JW] Why would the utility network require the global address space provided > by the user's ISP?
I can imagine that it might require this on the grounds that provider aggregation will make it easier for the utility network to aggregate routes to its subscriber's residential networks. Otherwise, every subscriber ends up advertising their own ULA prefix into the routing domain of the utility network, and the result is a routing table explosion. > From a security POV, I surely wouldn't want a > gateway to my network to which I have absolutely no control over (power > meter for instance) have unfettered access to my home network. That's an orthogonal issue. From a security POV, you should have control over all the nodes in the network demarcated by the boundaries of the routing domain in your home. If you don't have control over the power meter, then it shouldn't be in your routing domain. You should have your own router, which you control and which enforces your policies, as the gateway to the utility network. > It was my > understanding that the meter would be the demarc between the home network > and the utility network, collecting data from electrical sensors with a > Zigbee interface. If it has a network connection to the home gateway I > would think it would use the home gateway's provided address space. I'd like to know how these utility operators would like to define the boundaries of their networks and how they should be demarcated from private residential networks with which they intend to interwork. Is there a document, preferably an Internet draft, which I should read to understand that? -- james woodyatt <[email protected]> member of technical staff, core os networking _______________________________________________ homenet mailing list [email protected] https://www.ietf.org/mailman/listinfo/homenet
