North American Network Operators Group

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Re: IPv6 routing /48s

  • From: Joe Abley
  • Date: Mon Nov 17 18:47:54 2008

On 2008-11-17, at 17:46, [email protected] wrote:

Are there any parties out there routing /48 IPv6 networks globally?

Yes. Some particularly visible examples are root and TLD server operators. There are some TLDs which are well-served by IPv6-capable nameservers, but which would be completely invisible to v6-only clients if their covering /48s were not accepted.

ASes which refuse prefixes longer than 32 bits across the board as a matter of policy are broken.

The last time I looked, the RIRs with v6 micro-assignment policies were all doing long-prefix assignments from an easy-to-identify range of addresses. Creating a general-purpose filter which lets through PI / 48s but drops PA/deaggregated /48s is not rocket science.

I ran
into a supposed Catch-22 with Verizon and IPv6 address space and was
looking for clarification.

I was once told by another large carrier I was trying to buy from in Miami that "you are not allowed to announce your own addresses in IPv6; you have to use addresses from your upstream".

While the goal of encouraging use of PA addresses and discouraging deaggregation may be noble and good, it seems more education is required in some areas. "There is such a thing as PI in IPv6", for example, and perhaps "just because it's a /48 doesn't mean it's not PI".