nanog mailing list archives
Re: Using IPv6 with prefixes shorter than a /64 on a LAN
From: Mark Andrews <marka () isc org>
Date: Sun, 06 Feb 2011 13:40:51 +1100
In message <4D4DF75E.1040109 () brightok net>, Jack Bates writes:
On 2/5/2011 7:01 PM, Mark Andrews wrote:And did you change the amount of growth space you allowed for each pop? Were you already constrained in your IPv4 growth space and just restored your desired growth margins?Growth rate has nothing to do with it. ARIN doesn't allow for growth in initial assignments. No predictions, no HD-Ratio, and definitely no nibble alignments. Current policy proposal hopes to fix a lot of that.In the near future I expect to be somewhere between a /24 and a /28, which is an 8 to 12 bit shift right from my IPv4 /16 allocation.Only if you can serve all those customers from that /16. You are then not comparing apples to apples. You are comparing a net with no growth space (IPv4) to one with growth space (IPv6).Not sure I get ya here. I am comparing apples to apples. ARIN gives me a /16 of space. There are the same number of /16's in IPv4 as IPv6. However, in IPv6, they will allocate a /24 at most to me, and I will never exceed that. This shift of 8+ bits is the gains we get shifting from IPv4 to IPv6.
A IPv4 /16 supports 64000 potential customers. A IPv6 /32 supports 64000 potential customers. Either you have changed the customer estimates or changed the growth space allowances or were using NAT or .... You don't suddenly need 256 times the amount of space overnight all other things being equal. About the only thing I can think of is you need to advertise 256 routes and you are asking for extra blocks to get around poorly thought out filtering policies. A routing slot is a routing slot. It really doesn't matter if that slot has a /32 or a /40 or a /48 in it. They are equally expensive. If ISPs were being honest and matching IPv4 to IPv6 filtering the filters would be set a /40 not /32. By setting the filters to /32 you force the small ISP to ask for up to 256 times as much address space as they need with absolutely no benefits to anyone just to get a routing slot that won't be filtered. What's really needed is seperate the routing slot market from the address allocation market. Mark
Jack
-- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: marka () isc org
Current thread:
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN, (continued)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Jack Bates (Feb 04)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Owen DeLong (Feb 04)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Mark Andrews (Feb 04)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Jack Bates (Feb 04)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Mark Andrews (Feb 04)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Jack Bates (Feb 04)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Mark Andrews (Feb 05)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Jack Bates (Feb 05)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Mark Andrews (Feb 05)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Jack Bates (Feb 05)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Mark Andrews (Feb 05)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Jack Bates (Feb 05)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Mark Andrews (Feb 05)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Jack Bates (Feb 06)
- Re: Using IPv6 with prefixes shorter than a /64 on a LAN Mark Andrews (Feb 06)
- What's really needed is a routing slot market (was: Using IPv6 with prefixes shorter than a /64 on a LAN) John Curran (Feb 06)
- Re: What's really needed is a routing slot market Joel Jaeggli (Feb 06)
- Re: What's really needed is a routing slot market John Curran (Feb 06)
- Re: What's really needed is a routing slot market Joel Jaeggli (Feb 06)
- Re: What's really needed is a routing slot market Jimmy Hess (Feb 06)
- Re: What's really needed is a routing slot market William Herrin (Feb 06)