[dns-operations] Link-local IP addresses for a resolver?

Mark Andrews marka at isc.org
Thu Sep 26 01:14:08 UTC 2019

> On 26 Sep 2019, at 10:39 am, John R Levine <johnl at taugh.com> wrote:
> On Wed, 25 Sep 2019, Warren Kumari wrote:
>> ULAs are very from unique -- there is a huge bias towards things which
>> humans can remember / cute names, etc (this is very similar to the
>> "IPv6 space is namp / scannable because people name hosts in
>> deterministic ways" - see some presentations from Fernando Gont).
>> There is a large ULA bias towards fd00::, fd10::, fdfd::,
>> fd00:dead:beef:, fd00:bad:coff:ee::.
> Sigh.  If people don't follow the spec, not much we can do about that. My ULAs start with fde3:783e:127d: which I generated with a one line shell script
> $ jot -r -w%02x 10|rs

And BIND’s test prefix is fd92:7065:b8e::/48 which was generated with

dd if=/dev/random bs=5 count=1 | od -tx1

for bits [9..48]

> Regards,
> John Levine, johnl at taugh.com, Taughannock Networks, Trumansburg NY
> Please consider the environment before reading this e-mail. https://jl.ly
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Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742              INTERNET: marka at isc.org

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