Operator flagged that the pass5 IPv6 review followed prior rulings instead of
freshly assessing feasibility on the ruled links. Confirmed: pass5 cited
D-101/D-139 ("PXE v4-first", "provider dual because internet=v4") as the answer
and punted the researchable question. This pass researches ACTUAL platform
capability (upstream docs/source/bug-trackers, deployed versions: MAAS 3.7.2,
Juju 3.6.27, Caracal 2024.1, OVN 24.03.2, OPNsense 26.7, Ceph Reef), ruling-
independent, with real citations (WebSearch/WebFetch throughout).

Headline: IPv6 is substantially MORE feasible than the prior rulings held.
- metal-admin IPv6 commissioning FEASIBLE-WITH-WORK on UEFI (no MAAS blocker
  @3.7.2; only LEGACY-BIOS PXE is a firmware blocker, avoidable via UEFI);
  MAAS rack<->region v6 FEASIBLE-NOW (source prefers AF_INET6). -> D-101's
  absolute "PXE v4-first" is an overstated judgement, not a capability limit.
- provider-public v6 FEASIBLE-NOW via direct GUA routing (v6 uses NO floating
  IP); D-139's "dual because internet=v4" conflated provider-network family
  (v6-capable now) with external v6 internet reachability (the only true v4 need).
- Octavia LB VIP v6 FEASIBLE-NOW; hacluster API-VIP FEASIBLE-WITH-WORK (one charm
  bug LP#2111852); uplink edge FEASIBLE-WITH-WORK (OPNsense ready; routed not NAT66).

CONFIRMED still-hard (fresh check validated the ruling): juju LP#1723240 live-
verified still open in 3.6.27 (D-141 holds); external v6 internet (deferred).
NEW: Ceph binds one family per daemon -> v6 cross-DC replication needs the whole
cluster single-family (DEC-24 constraint, previously unassessed).

Findings CHALLENGE D-101 (PXE) and D-139 (provider-public) framings -- surfaced
for operator RECONSIDERATION, NOT ruled (GA-R5). Two DOCFIX candidates flagged
(stale OVN "No" row vs the repo's own geneve proof; soften D-101 "PXE v4-first").

pass5 note annotated as CORRECTED. D-144 owed section + CURRENT-STATE updated
(GA-R1 C1). Deliverables: pass6-w1/w2/w3 + pass6-ipv6-feasibility-note. repo-lint
0-fail.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Fg98z7QyzwYUs8fsWCn728