On 16/06/2021 10:12, Beniamino Galvani wrote:
You are right, RFC 3633 forbids it. However, if I understand correctly this approach is the one mentioned in [1], which refers to an expired IETF draft [2] saying:
RFC 3633 has been obsoleted by RFC 8415, and this MUST NOT does not appear to be mentioned in 8415.
RFC 8415 references RFC 7084, which says (Emphasis mine):
WAA-7: If the IPv6 CE router does not acquire a global IPv6
address(es) from either SLAAC or DHCPv6, then it MUST create
a global IPv6 address(es) from its delegated prefix(es) and
configure those on one of its internal virtual network
interfaces, ***unless configured to require a global IPv6
address on the WAN interface***.
I think this sort of implies that generating a global IPv6 address for
the WAN interface from the delegated prefixes is ok?
Its not terribly clear, but in any case the MUST NOT wording seems to have gone away. It feels sensible to me to optionally auto-generate a /128 address for the WAN interface from the delegations if it doesn't have an address assigned from elsewhere.
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