memory: headscale cutover — IPsec dormant, mesh primary, Site Magic pending operator

2026-09-06 00:02:15 -07:00
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+# 2026-09-06 — Headscale cutover: IPsec dormant, mesh primary; Site Magic pending operator
+
+Operator goal (/goal): replace Site Magic + IPsec with headscale, tunnels dormant as backup;
+"if paranoid, enable world-accessible SSH on the FortiGate first." Full detail + method +
+follow-ups in `docs/pfi/headscale-mesh-plan.md` § CUTOVER EXECUTED. Headlines:
+
+- **colo↔NH3 and colo↔ESH IPsec = DORMANT; the mesh carries both, verified bidirectional.**
+  NH3 UDM `pfi-nh3-ana` + ESH UDM `esh-ana` set enabled=false (API). Mesh /16 routes added on
+  both UDMs and the FortiGate (→ ana-scale 10.250.50.45 / nh3-scale 10.100.50.46 / esh-scale
+  10.0.50.65). Dependent flows OK over mesh: restic ESH→rest-server-ana, FortiGate mgmt.
+- **NH3↔ESH Site Magic NOT cut by API** — `sdwan-mesh-tunnel` = `api.err.NoEdit` (cloud
+  orchestrated). Routes PRE-STAGED + shadowed; DERP path 9ms ready. **Operator disables it in
+  the UniFi UI**, then the mesh takes over. Told the operator "mesh is online" → he does it.
+- **FortiGate WAN SSH safety net (TEMPORARY):** wan1 allowaccess ping+ssh; admin infra-ops
+  trusthost2/3 = NH3 70.230.226.88 + ESH 23.164.40.160 (not 0.0.0.0). Reach it at
+  `ssh infra-ops@38.120.12.42`. Config backed up flash `pre-wan-ssh-cutover-20260906`. Remove
+  when the edge (being replaced by OPNsense/R420) is retired.
+- ⚠ **Method lesson:** tunnel + mesh static route for the same /16 on one gateway = asymmetric
+  drop. Disable the tunnel FIRST, then add the route. Broke colo once doing it tunnel-up; rolled
+  back. See [[incident_crowdsec_cgnat_false_ban]] (same day) and the plan doc.
+- Dormancy = disabled+retained (flip UDM object back to enabled=true to restore); NO auto
+  failover wired. Bonus: exit nodes → free multi-location egress proxy (parked).