I described ea:f6:0a:ca:f5:b4 as "locally administered, no OUI" and treated
it as the class of MAC that may regenerate at boot. ha-dev corrected it and
the correction verifies: the device advertises e8:f6:0a:ca:f5:b4 over mDNS,
which differs in exactly the locally-administered bit, and E8:F6:0A is
registered to Espressif Inc. in the IEEE registry while EA:F6:0A resolves to
nothing. That is the standard ESP32 pattern — one factory base MAC in eFuse,
sibling interface MACs derived deterministically — so the reservation is
keyed correctly and cannot drift on its own.
The PoE-cycle test still stands and is now corroborating evidence rather than
the only evidence. The residual risk narrows to a firmware change to the
derivation scheme.
Also from ha-dev: tcp/7638 is open alongside 6638; mDNS crosses the VLAN
boundary so HA rediscovers without help; and HA's pending smlight config flow
is keyed on the mDNS service name, which did not change, so a stale flow may
still hold the dead 10.0.10.58 and should be dismissed rather than confirmed.
ha-dev declined the dns: resolver fix on their stack — configuring by IP
costs them nothing and the entry would couple HA name resolution to AdGuard
uptime for no present benefit.
The coordinator arrived on esh-userland (VLAN 10) at a DHCP-assigned
10.0.10.58. It now sits on esh-iot (VLAN 90) at 10.0.90.10, reserved on
the UDM and named slzb-mr1u.esh.internal.
Address on the network side, not the device — the pfi-gx10 ruling: a
reservation moves with the hardware, a device-side static goes stale.
10.0.90.10 is below the 10.0.90.40-250 pool so it cannot be handed out.
The MAC is locally administered (ea:f6:0a:ca:f5:b4, no OUI), which is
exactly the case where a reservation can silently stop matching. The
PoE power-cycle that makes the device re-DHCP is also the stability
test, so it cost nothing: it rebooted and came back on exactly
10.0.90.10, which only happens if the MAC held.
ESH-Media carried 8 port_overrides and that PUT is a whole-array
replace, so the array was diffed to prove exactly one field on one port
changed before sending, and read back after.
Inter-VLAN reachability needed no firewall work and was proven from
inside the HA container before the move, against existing IoT devices.
Testing from the Docker host would have proven the wrong thing — HA
runs on a macvlan address, 10.0.50.46, not the host's 10.0.50.45.
Documented but NOT fixed: the HA container cannot resolve any
.internal name (its resolver is Docker's 127.0.0.11, upstream excludes
the fleet AdGuard). Pre-existing, verified against names that predate
this change. HA should be configured with the IP; changing the DNS of
a live home-automation stack is ha-dev's call.
vh