On Wed, 25 Sep 2019, Mark Andrews wrote:
ISP’s advertings ULA’s to customers have similar problems with
advertising LLL to customers. The CPE should be the site boundary making
the ISP’s DNS servers unreachable from inside the customer’s network.
DNS servers that are expected to be reached across sites need to be
globally unique addresses which ULA and LL are not.
If a ULA isn't globally unique, something is pretty broken. Each ULA
contains a 40 bit random global ID in the prefix that's there so ULAs on
different networks won't collide if they happen to be connected. That's
why the U stands for, you know, Unique.
Regards,
John Levine, [email protected], Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly
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