3 ms·

Nothing breaks irrevocably in subnets smaller than /64, including SLAAC and privacy addresses. You just need NDP proxies between them.

• jandrese 5y ago
  There are plenty of second order effects though. Like IPv6 blacklists operating at the /64 level or higher. Sharing a /64 is like being behind the same natted IPv4 address as a bad guy.
  • Arnavion 5y ago
    Right, I wasn't saying that giving end-users something smaller than a /64 should actually be done. Not only does it require more effort but also it breaks higher-level things as you said. I was just saying that there's no technical breakage that would occur, especially not SLAAC or privacy addresses.
  • oarsinsync 5y ago
    > Like IPv6 blacklists operating at the /64 level or higher Several blocklists I'm aware of block at /48s, not at /64s, on the basis that customer allocations (per the spec) are supposed to be /48s. Not enough people use IPv6 right now, so the level of complaints from this is low->zero.
    • Arnavion 5y ago
      RFC6177 (2011) obsoleted the recommendation (which is all it was to begin with, not a "supposed to") that end users should get /48s.