On 16 Feb. 2017 8:14 pm, "Randy Bush" <randy(_at_)psg(_dot_)com> wrote:
"something useful" makes it subjective.
some of us try to operate networks. useful is what customers pay us to
do.
SLAAC, NPT66, ILNP are the biggest one that I can think of.
slaac is real, used, and is useful in some environments that customers
want.
One of the benefits of a /64 is that IIDs within it can be sparsely
distributed, making device discovery by unsolicited inbound address probing
ineffective.
I think a router having these sorts of sparse IIDs in its addresses would
be a useful mitigation against router control plane attacks, such as a syn
attack on port 179 from the Internet.
Regards,
Mark.
Trivial to make SLAAC work with variable length prefixes of course.
64 for slaac is fine.
for the rest, we went to cidr over a decade back, when folk scammed mo
out of 8+8.
randy
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