RFC 7084, "Basic Requirements for IPv6 Customer Edge Routers", November 2013

Note: This RFC has been updated by RFC 9096

Errata ID: 7700
Status: Reported
Type: Technical
Publication Format(s) : TEXT
Reported By: Alin Nastac
Date Reported: 2023-11-14

Section 4.3 says:

   L-14:  The IPv6 CE router MUST send an ICMPv6 Destination Unreachable
          message, code 5 (Source address failed ingress/egress policy)
          for packets forwarded to it that use an address from a prefix
          that has been invalidated.

It should say:

   L-14:  The IPv6 CE router MUST send an ICMPv6 Destination Unreachable
          message, code 5 (Source address failed ingress/egress policy)
          for packets forwarded to it that use an address from a prefix
          that has been deprecated.

Notes:

The prefix route still need to exist on CPE to allow sending ICMPv6 errors back to the offending host.

Only deprecated prefixes (preferred lifetime=0, valid lifetime > 0) still have such route installed in CPE.

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