<Let's see, this argument has now been had on CIDRD, Big-Internet, Com-Priv, and now it seems to have struck NANOG. Anyone care to guess how many more mailing lists we can have the same debate one? This is really tedious, stupid, and wasteful, everyone.> From: john@interport.net (John Riordan) we have had similar problems trying to grow and operate as a small niche provider. It all seems to stem from the understandable fact that the larger providers are trying to look out for the interests of Internet as a whole as well as themselves. This whole conversation would be a more productive if we could basically (see below for exceptions) leave the large and small providers out of it, as well as people looking out for whomever, etc. This whole renumbering/topopology-based-addresses stuff all has its roots years and years back, before we had *any* providers, large, small, or gargantuan. It's here now for reasons that have nothing to do with providers or business reasons. As things stand now, unless we change the Internet so that IPv4 addresses are no longer used by the routing, we have this renumbering/TBA stuff to wrestle with. So, please let's not hear anything more about large providers looking out for anyone, small providers losing, etc, etc. That may be the *effect*, but it's not the *cause*. Anyone who thinks otherwise has ahold of the wrong end of the stick. The one exception to all this is that in any hierachical addressing scheme, as one goes up the tree eventually one gets to chunks of the network which are large enough that one doesn't need to aggregate anymore, and if you're a very large provider, maybe you get to be one of those high-level chunks. These chunks, being top level naming objects, wouldn't have to rename as the topology changed. So, in that sense, maybe the very large providers have an advantage. I don't know how to fix this. However, I feel .. that a competitive market place which allows small niche providers to compete will benefit the Internet in the long run. All else being equal, I agree with you. However, we have to have a working Internet first, and as long as IPv4 addresses are used by the routing, they have to be aggregable, which means they have to be connectivity-based, which means they change when you move. Within that envelope, I'm open to suggestions. it is not clear to me how a policy which only enables organizations able to justify /18 portable independent allocations for reassignment ... will provide a competitive environment which includes small niche providers. I personally think the whole concept of filtering routes based on prefix size is an ugly stopgap, one with bad side-effects. All the prefix-size thing is is an attempt i) to limit the current number of entries in the routing table by getting rid of ones that likely only benefit a few people, and ii) to limit the maximum possible size of the routing tables (although 2^18 is still probably too big). The limit might have to move up if we fill the routing tables with /18's... Maybe I'm missing something, maybe all this is being taken care of as I write this ... or maybe the Internet would be better off without all the small niche providers. You seem to keep assuming that this is all being done to the intended detriment of small providers. It's not. If there were a better solution available already deployed (which is the timeframe we're talking in), I'm sure we'd all be happy to use it. There isn't. My hope is that those parties who do influence policy creation will leave room for small niche players players to compete when they do come to agreement on this and future issues. You seem to keep overestimating the degree to which this is driven by policy. The policy is just strugling to ameliorate the bad side-effects of the technical box we are in, and frankly, there isn't a lot to be done. Also I hope that those same parties are cognizant of the fact that actions they take to further their goals can have a serious impact the small players out there. ... it could devastate a small niche provider someplace who has to say to their clients, "Sorry, we are only able to provide you with partial Internet service at the moment because Sprint doesn't like the addresses we assigned you". "further their goals"? I'd assume that having a working Internet is a goal we *all* share, and not just some nebulous crowd of large providers (AKA Bad Guys). If you don't like the picture of telling your customers that, why don't you try telling them "Sorry, we are only able to provide you with partial Internet service at the moment because due to the way people have assigned addresses, the routing has fallen over." Are they really going to care much about exactly what the phrase is after "because"? Noel
Date Sent: 24-SEP-1995 18:03:39 Noel wrote:
<Let's see, this argument has now been had on CIDRD, Big-Internet, Com-Priv, and now it seems to have struck NANOG. Anyone care to guess how many more mailing lists we can have the same debate one? This is really tedious, stupid, and wasteful, everyone.>
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(although 2^18 is still probably too big). The limit might have to move up if we fill the routing tables with /18's...
Let's say we did have an absolute limit of /18s and 2^18 entries. 2^18 entries of 32 bytes each is 16Mb, which is almost within the capacity of a Cisco 2500. (Well, Ok, CISCO would do something clever about not storing the complete net and mask given that it would never be more than /18 for external networks.) Why is this a problem? Ehud -- Ehud Gavron (EG76) gavron@Hearts.ACES.COM
(although 2^18 is still probably too big). The limit might have to move up if we fill the routing tables with /18's...
Let's say we did have an absolute limit of /18s and 2^18 entries. 2^18 entries of 32 bytes each is 16Mb, which is almost within the capacity of a Cisco 2500. (Well, Ok, CISCO would do something clever about not storing the complete net and mask given that it would never be more than /18 for external networks.)
This is presuming that we can nuke the older Class C's in the swamp, and that we only have one view to worry about. I envision an eventual environment where there are 20 or more well used exchange point across the United States. I suspect this is about what the US Internet will look like a year to a year and half from now. 20 ways out means 19 alternate paths to store in memory. Despite the fact that Tony says that alternate's don't take up as much room as the prefix itself, this is not a trivial amount of memory consumption that can be ignored on the large scale. Dave -- Dave Siegel President, RTD Systems & Networking, Inc. (520)318-0696 Systems Consultant -- Unix, LANs, WANs, Cisco dsiegel@rtd.com User Tracking & Acctg -- "Written by an ISP, http://www.rtd.com/ for an ISP."
participants (3)
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Dave Siegel
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Ehud Gavron
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jnc@ginger.lcs.mit.edu