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

Mark Andrews marka at isc.org
Wed Sep 25 02:31:58 UTC 2019

> On 25 Sep 2019, at 11:52 am, John Levine <johnl at taugh.com> wrote:
> In article <9CA43B29-1345-4FD4-9766-36C624589DA0 at isc.org> you write:
>> 	         ISP SITE <-> CPE <-> CUSTOMER SITE
>> The CPE is a SITE boundary.  It is also a Link-Local Boundary. ULA source
>> packets DO NOT cross the CPE by default it the CPE is properly configured.
> Really?  Are you sure you're not confusing LL and ULA addresses?  Why
> would CPE filter ULA addresses?  In the normal case where the ISP
> provides the customer with a default route, they're like global
> addresses.

Because the CPE is a site boundary.

RFC 7084. Basic Requirements for IPv6 Customer Edge Routers

                            The IPv6 CE router defaults to acting as the
   demarcation point between two networks by providing a ULA boundary, a
   multicast zone boundary, and ingress and egress traffic filters.

Which is referenced in the CableLabs documents.

> R's,
> John
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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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