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[ih] IPv6 addressing

It also fails the "having customers share a /64 is an antipattern" test, a corollary of the "no, really, IPv6 addressing really *is* that big" test.

On Sun, Nov 10, 2019, at 12:46 PM, John Levine via Internet-history wrote:
> In article <871rugec4y.fsf at taht.net> you write:
> >I finally disabled IPv6 on my email exchangers today. For no reason
> >I can figure, every use of it put me in spamhaus's SBL blacklist,
> >for most of the past year, if not longer.
> 
> Turns out the problem is that his cloud provider, Linode, puts all of
> their VPS in a single /64 which is of course full of random spammers
> which get the /64 on the SBL.  I think this provisioning strategy
> fails the "be conservative" test.
> 
> One can ask for one's own /64 which I believe he has done.
> 
> R's,
> John
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