nanog mailing list archives
Re: is ipv6 fast, was silly Redeploying
From: Owen DeLong via NANOG <nanog () nanog org>
Date: Mon, 22 Nov 2021 20:45:17 -0800
On Nov 22, 2021, at 02:45 , Masataka Ohta <mohta () necom830 hpcl titech ac jp> wrote: Mans Nilsson wrote:Not everyone are Apple, "hp"[0] or MIT, where initial allocation still is mostly sufficient.The number of routing table entries is growing exponentially, not because of increase of the number of ISPs, but because of multihoming.
Again, wrong. The number is growing exponentially primarily because of the fragmentation that comes from recycling addresses.
As such, if entities requiring IPv4 multihoming will also require IPv6 multihoming, the numbers of routing table entries will be same.
There are actually ways to do IPv6 multihoming that don’t require using the same prefix with both providers. Yes, there are tradeoffs, but these mechanisms aren’t even practical in IPv4, but have been sufficiently widely implemented in IPv6 to say that they are viable in some cases. Nonetheless, multihoming isn’t creating 8-16 prefixes per ASN. Fragmentation is.
Your reasoning is correct, but the size of the math matters more.Indeed, with the current operational practice. global IPv4 routing table size is bounded below 16M. OTOH, that for IPv6 is unbounded.
Only by virtue of the lack of addresses available in IPv4. The other tradeoffs associated with that limitation are rather unpalatable at best. Owen
Current thread:
- Re: is ipv6 fast, was silly Redeploying, (continued)
- Re: is ipv6 fast, was silly Redeploying Michael Thomas (Nov 19)
- Re: is ipv6 fast, was silly Redeploying John Levine (Nov 19)
- Re: is ipv6 fast, was silly Redeploying John Lee (Nov 19)
- Re: is ipv6 fast, was silly Redeploying Saku Ytti (Nov 20)
- Re: is ipv6 fast, was silly Redeploying j k (Nov 23)
- Re: is ipv6 fast, was silly Redeploying Masataka Ohta (Nov 20)
- Re: is ipv6 fast, was silly Redeploying Owen DeLong via NANOG (Nov 20)
- Re: is ipv6 fast, was silly Redeploying Masataka Ohta (Nov 21)
- Re: is ipv6 fast, was silly Redeploying Måns Nilsson (Nov 21)
- Re: is ipv6 fast, was silly Redeploying Masataka Ohta (Nov 22)
- Re: is ipv6 fast, was silly Redeploying Owen DeLong via NANOG (Nov 22)
- Re: is ipv6 fast, was silly Redeploying Masataka Ohta (Nov 23)
- Re: is ipv6 fast, was silly Redeploying Owen DeLong via NANOG (Nov 23)
- Re: is ipv6 fast, was silly Redeploying Masataka Ohta (Nov 23)
- multihoming Dave Taht (Nov 23)
- Re: multihoming Masataka Ohta (Nov 23)
- Re: multihoming Baldur Norddahl (Nov 24)
- Re: multihoming Saku Ytti (Nov 24)
- Re: multihoming Christopher Morrow (Nov 24)
- Re: multihoming Geoff Huston (Nov 24)
- Re: multihoming Christopher Morrow (Nov 24)