On Fri, Oct 17, 2014 at 12:54 PM, Ted Lemon <[email protected]> wrote:
> On Oct 17, 2014, at 2:49 PM, James Woodyatt <[email protected]> wrote: > > As I recall, the proposals in your response were less than concrete and > didn't solve the problems. In particular, I remain curious about how to > expire the locally generated ULA prefixes that accumulate over repeated > network joins and splits. I remember explaining how those events could be > rather more frequent than people might be assuming, and that's where the > discourse seemed to stop. > > If you don't burn a ULA prefix every time you split and rejoin, then I > don't see why there would be any kind of significant growth in prefixes. > That's why I suggested the algorithm that I suggested. > I explained why you must generate a new ULA prefix every time you commission a new network. It's true that not every split entails commissioning a new network, especially when the AAA service for the previously commissioned network is still available on both sides of the split, but that isn't always true, and besides, human user behavior must still be accounted. Whenever you have AAA service, you are attempting to automate what humans think about who is and who isn't allowed to do what. Sometimes people change their plans. Sometimes people don't plan at all. Sometimes people make plans and don't tell anyone, much less the silicon beasties in their house. Sometimes they make plans without even recognizing it. Routers have to operate mostly in the dark when a split happens. They may not be able to determine whether they are still expected to be members of the previously commissioned network or if they have been repurposed into a new network until well after they have been operating split for some time, and perhaps joined with other networks in the meantime. After a split, they may need to operate in a mode that allows them to commission a new standalone network at any time when they are split from a previously commissioned network. In any case, we have defined a way for locally generated ULA prefixes distributed in persistent storage of HOMENET interior routers to accumulate without limit when independently commissioned networks join. Offering the view that sensible people don't commission new networks very frequently is not a solution to the problem. It's a way of implying the problem isn't relevant to your interests. The problem may not be relevant to your interests, but it is to mine. -- james woodyatt <[email protected]> Nest Labs, Communications Engineering
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