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Re: Verio Decides what parts of the internet to drop
Austin writes: >George writes: >>I am not sure whether the danger in opening up the B space for >>/17 blocks is particularly bad, but lacking a single consistent >>policy body with sufficient clue about both the Tier-1 backbone >>issues and the address allocation issues, it's hard to fault >>any given ISP for insisting on /16s in B space. >> > Sounds good, but what exactly does that mean? Does any end network >capable of justifying a /24 then get a routable chunk, thus blowing up the >tables? What if you could do it based upon traffic generation? That would be >difficult to verify, and the definition for 'large' amounts of traffic is >ever changing. > So, if we say that a /20 is a sufficiently large amount of space to >get a routable chunk, then they would be able to get it from ARIN anyway, >and we're back to square one. > In the far term as space becomes scarce we will need to find a solution >to wasted B space, but that is several years out. Perhaps by that time routers >will have so much memory and CPU as to make an extra ~4 million possible routes >negligible. The danger of /17 blocks in B space is limited to 64*256 more routes (16 k more, maximum). All at once that would be bad, but over time it would be reasonable. I would personally, were I setting route policy at a Tier 1, allow a /17 in B space, but there's no reason to try and force anyone else to accept that. As others don't right now and aren't inclined to, I would dissuade anyone from trying it as it's either going to be a royal pain or impossible to get routing for. Again, this is where not having a single policy body is killing us; some people get oddball blocks, somehow or another, and are then screwed on routability. I am most certainly not going to suggest radical surgery to the current way of doing it; right now, small places deserving of multihoming have to work at it, and you have to be clued enough to not step in a few holes like trying to portably subdivide a B. I am not sure that there's any obvious fix in the nearterm for those problems, which are avoidable. As long as they're avoidable I think the thing to do is to leave well enough alone. -george william herbert [email protected] Disclaimer: I speak for myself only, not my ISP, Cats, wife, or car.