nanog mailing list archives
RE: CIDR Report
From: "Daniel L. Golding" <dan () netrail net>
Date: Sun, 14 May 2000 14:35:27 -0400 (EDT)
Of couse, folks have to decide what's important: 1) Routing Table size Is this as important of an issue as it was 3 years ago? Nope, not with M40s and GSRs as standard backbone routes. 100K routes is no sweat with these boxes. Of course, some of the big carriers would have to finally replace some of those older 7505s floating around their networks. 2) IP Address Space Scarcity There is no real address space scarcity. We still have most of 64/2 to go through. And there is always an easy answer to this "problem" - turn IP space into a commodity and have an exchange system where folks purchased address space from each other. This would result in the hoarded "class A" space being thrown back into circulation, as the companies that had them would have an incentive to unload them - money. As IP space is really not that scarce (and would be less so with the Class A's in circulation), the prices would be reasonable. When they became unreasonable, there would be a market-driven move to IPv6. Ah, capitalism. The answer to most of these issues is to allow much smaller allocations in a specific block - say 65/8. Allow /24-/21 allocations in this block for smaller multihomed enterprises. Then, start cracking down on the other blocks by filtering smaller prefixes. This would enforce necessary aggregation where possible, but still allow multihomed enterprises to obtain an appropriate amount of IP space on their own. As far as routing table growth - with current practices, we will continue to see this level of growth due to an increase in the number of multihomed enterpises. How mane non-ISPs ran BGP with upstream providers a few years ago? How many do now? The growth is astonishing... Daniel Golding Director, Network Evaluation and Design NetRail, Inc. On Sat, 13 May 2000, Roeland Meyer (E-mail) wrote:
I've mentioned this before, so I'll just note it lightly. There are a growing number of companies (dot-coms are only one of them) that have small head-count (<4000), but are spread out from Sydney to New York, with many "lone eagles" in the MST zone. They could probably do everything on a portable /24. However, with everyone filtering out announcements less than /20, such companies are encouraged to drop NAT, and use other methods to justify a /19, just so they can participate in peering (I won't say whom, one is a CTI development company). The VPN solution is cute, but the entire VP then becomes single-homed, at the VPN gateway (The alternative is that each location gets their own /24, linked by a VPN, to the other /24s, there are serious performance issues with this approach and hte /24 may only represent a single actual user). All of this burns IP addresses. The point: Filtering BGP announcements costs in IP space allocations. There is a mathmatical relationship between IP address allocations, table sizes, and routing policies. Also, part of the relationship is determined by client business requirements. Organizations are becomeing more geophysically diffused, with many end-nodes actually participating in multiple organizations. This is only starting now (I still see over 100K nodes actually doing this), it will get much worse.-----Original Message----- From: owner-nanog () merit edu [mailto:owner-nanog () merit edu]On Behalf Of Mikael Abrahamsson Sent: Saturday, May 13, 2000 2:10 AM To: nanog () nanog org Subject: Re: CIDR Report On Sat, 13 May 2000 pjnesser () Nesser COM wrote:But if you look at the last 250 days or so you see that thetable hasgrown by more than 16k routes. So we are seeing growth at300% of what wesaw for the last 5 plus years. It also looks annoyinglygeometric orperhaps exponential, instead of the nice linear growthsince CIDR wasintroduced.If you just check from 01/01/99 to date then it looks linear or at least close to linear. I guess it *could* be that growing amount of new companies getting internet access is increasing. Is there any data that show "CIDR GAIN" from the cidr report, so we can see if the increase corresponds to an increase in (perhaps unneccessary) smaller announcements in larger blocks, or if it is actually just a lot more blocks allocated that needs to be routed. Any stats on arin/ripe/apnic new allocations of blocks in the same timeframe? Both in terms of IP adresses and in number of blocks of IP adresses. This would also give us some kind of hint as to when IPv4 space will be exhausted (or are there already projections about this?) -- Mikael Abrahamsson email: swmike () swm pp se
Current thread:
- CIDR Report pjnesser (May 13)
- Re: CIDR Report Mikael Abrahamsson (May 13)
- RE: CIDR Report Roeland Meyer (E-mail) (May 13)
- RE: CIDR Report Daniel L. Golding (May 14)
- Multi-home I (was CIDR Report) Rural CNE (May 13)
- RE: CIDR Report Roeland Meyer (E-mail) (May 13)
- Re: CIDR Report Christian Nielsen (May 13)
- Re: CIDR Report Vijay Gill (May 13)
- Re: CIDR Report Mark Kent (May 13)
- Re: CIDR Report Geoff Huston (May 13)
- Re: CIDR Report Jeremy Porter (May 14)
- <Possible follow-ups>
- RE: CIDR Report Owen DeLong (May 13)
- Re: CIDR Report Danny McPherson (May 13)
- RE: CIDR Report Roeland Meyer (E-mail) (May 13)
- Re: CIDR Report Randy Bush (May 13)
(Thread continues...)
- Re: CIDR Report Mikael Abrahamsson (May 13)