The rotating privacy address was not itself the packet-loss mechanism:
the 2026-07-13 discrimination experiment (4 flows, dual-ended capture)
showed the loss keyed to hbc's exact 5-tuple — upstream per-flow state
poisoned when the flow was created during boot/apply address churn, kept
alive forever by the 10s heartbeat cadence. Fresh flows to the same
host/port were clean; restarting hbc fixed it instantly. use_tempaddr=0
stays: it removes one source of the churn that poisons newborn flows.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NuPg8vz6FmDUj4SgEJ525C
Root cause of the flow-selective IPv6 heartbeat loss investigated
2026-07-12/13: Ubuntu ships /usr/lib/sysctl.d/55-ipv6-privacy.conf with
use_tempaddr=2 system-wide. Nothing on wlan0 overrode it before this
morning's netplan fix, so the interface carried a rotating privacy
address alongside the stable one. hbc's long-lived flow eventually
straddled a temp-address deprecation event mid-flight, which looked
exactly like random upstream packet loss (in-transit, IPv6-only,
flow-selective) and cost a day of packet captures before the cause
turned out to be this default fighting the WAN config instead.
The netplan/NM ipv6.ip6-privacy=false fix already forces this per
connection, but that's a timing-dependent override racing a package
default. This makes it explicit and permanent: 99- loads after (and
wins over) 55- the next time sysctl --system runs.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
With wifi + Starlink + cellular as uplinks, the onboard GbE earns its keep
as a wired LAN port instead of the metric-150 ethernet WAN: eth0 leaves
netplan/NM (added to van-ap-unmanaged.conf) and joins br0 via networkd
(23-van-lan-eth0.network), so wired clients get 10.42.0.x DHCP/DNS and NAT
exactly like Wi-Fi clients. The eth WAN is gone from van-failover's config.
Cutover notes: delete the old netplan-eth0 / stray eth0 NM profiles, then
nmcli general reload + networkctl reload/reconfigure eth0. NEVER cable this
port (or the USB LAN dongle) back into an upstream LAN — dnsmasq on br0
would serve rogue DHCP there; STP stays off, so don't cable both wired LAN
ports to the same switch either.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
The Starlink RTL8153 gets a declarative NM profile in 50-van-wan.yaml
(replaces the auto 'Wired connection 1') with a 192.168.100.1/32 link route,
so the dish's management address stays reachable from the router and — via
the existing !br0 masquerade — from the van LAN, regardless of which WAN
holds the default route.
New Cockpit "Starlink" card queries the dish's gRPC API (:9200, get_status
via grpcurl — not packaged in apt, deploy.sh warns when missing) inside the
existing single batched spawn: online/obstructed/outage pill, alerts,
uptime, sw version, PoP latency, down/up throughput, obstruction %.
Sentinels distinguish adapter-absent / no-grpcurl / dish-unreachable.
Gotcha captured while cutting over: a WAN profile without ipv4.route-metric
makes NM re-assert its DHCP default (metric ~101) against van-failover's
enforce_route pruning every cycle; the profile metric must match (failover's
set_profile_metric does this on health transitions).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
The fixed 2 GiB ha_van allocation starved the 4 GB Pi. HA Container now
runs on the host network (http://10.42.0.1:8123): ha/homeassistant.container
installs to /etc/containers/systemd/, config in /srv/homeassistant, host
D-Bus mounted for onboard Bluetooth (needs apparmor=unconfined — Ubuntu's
dbus-daemon mediates per AppArmor label and denies AddMatch to BlueZ —
plus NET_ADMIN/NET_RAW for habluetooth adapter recovery).
Drop the VM-era plumbing: the 10.42.0.50 dhcp-host pin becomes a
host-record for 10.42.0.1, and the legacy-URL DNAT + hairpin masquerade
go away entirely. ha_van.xml retired to git history.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
The x86 ha_van stayed behind on wayback at the port (9bf1420 dropped
ha/ and its DNAT/lease); with the hub moved and the Pi owning
10.42.0.0/24, HA follows. New domain XML: machine=virt + AAVMF EFI,
virtio-scsi HAOS 18.1 aarch64 image, 2 GiB (data restored from an HA
full backup — the x86 qcow2 can't cross architectures). Same MAC, so
the dnsmasq pin (10.42.0.50 / "homeassistant") and the legacy
10.42.0.1:8123 DNAT + br0 hairpin port back verbatim.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
The USB hub (5GHz + 2.4GHz AP dongles, Starlink + LAN RTL8153s) moves over
from wayback; MAC-derived wlx*/enx* names travel with it, so hostapd/
networkd/cockpit configs are unchanged. Pi diffs only: failover WAN list
(wlan0 wifi 100, eth0 150, starlink USB 200, Koodo 300), cpu_thermal
sensor, bcm2835 watchdog 10s, no HA DNAT/lease, and deploy.sh drops
battery/lid/heartbeat/ZT-dns. Netplan reference in ap/50-van-wan.yaml.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Second radio (wlxd8ec5e2faa8c, RTL8822BU/rtw88), same VanLink SSID+PSK,
ch6 HT20, bridged into br0 next to the 5GHz AP. Runs as its own hostapd
instance + own watchdog so a USB wedge on one radio never darkens the
other; van-ap-watchdog now takes conf path + unit name as args (defaults
unchanged). rtw88.conf disables deep power-save (rtw89 gotcha analog)
and the driver's USB2->3 self-upgrade (USB3 noise in the 2.4GHz band —
note: dongle currently sits in a USB3 port, so it still enumerates
SuperSpeed; move to a USB2 port if 2.4GHz range disappoints).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
The VM lived on libvirt's default NAT net (192.168.122.50) behind a
/etc/libvirt/hooks/network hook that inserted FORWARD accepts above
libvirt's REJECT. libvirtd restarts re-inserted its chains on top
without firing the hook, silently cutting clients off from HA.
Now the VM's NIC (virtio, was e1000) bridges into br0: pinned lease
10.42.0.50 / name 'homeassistant' via van-ap dnsmasq, mDNS discovery
works, and no firewall hook can rot. Legacy http://10.42.0.1:8123
kept working via DNAT + same-subnet hairpin masquerade. Hook, libvirt
DHCP reservation, and iptables rules removed; domain XML in ha/.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
After a USB re-enumeration the rtw89 radio can come back as a fresh DOWN
netdev, dropped from br0, while the still-running hostapd never notices and
never exits — so Restart=always never fires. hostapd_cli keeps answering
state=ENABLED off stale in-memory state, so the watchdog considered the AP
healthy and left it dark (observed 2026-07-05: AP down ~16:41 until manual
hostapd restart).
Add link_healthy(): require the netdev to be operstate=up and still a port of
its bridge, alongside the existing state=ENABLED check. That catches the wedged
case the control socket can't see.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Starlink's USB ethernet shares a hub with the rtw89 Wi-Fi adapter; when Starlink
flaps, the hub re-enumerates and tears the radio down, so hostapd loses its
interface and exits. Two stock defaults left the AP dark: Restart=on-failure
misses clean exits, and the 5-in-10s start limit makes systemd give up during a
re-enumeration storm.
- hostapd-restart.conf drop-in: Restart=always, RestartSec=5, StartLimitIntervalSec=0
so hostapd retries forever until the interface returns (verified: SIGKILL -> back
to state=ENABLED in ~7s).
- van-ap-watchdog daemon: backstop for the case systemd can't see (hostapd running
but radio wedged). Polls hostapd_cli status; restarts hostapd if the iface is
present but not ENABLED, waits it out if the iface is mid-re-enumeration.
- hostapd.conf: add ctrl_interface so the watchdog can read the real AP state.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Add a wired LAN port on the same 10.42.0.0/24 segment as VanLink WiFi by
bridging both into br0. The gateway IP, dnsmasq, and NAT move off the wlan name
onto br0; hostapd (not networkd) enslaves the wlan via bridge=br0, since a
station-mode wlan can't be bridged until it's in AP mode. NM leaves the wired
port unmanaged so networkd owns it. Failover/Starlink (enxd8ec5eeb3512)
untouched.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Andreas WredeandClaude Fable 5
andreas