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lan: repurpose onboard eth0 as an internal LAN port on br0

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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>
This commit is contained in:
Andreas Wrede
2026-07-12 07:44:44 -04:00
co-authored by Claude Fable 5
parent 751facd511
commit a36b64c7c4
6 changed files with 32 additions and 20 deletions
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ap/50-van-wan.yaml
+7 -11
View File
@@ -1,18 +1,14 @@
# /etc/netplan/50-van-wan.yaml — replaces cloud-init's 50-cloud-init.yaml.
# Both onboard interfaces plus the Starlink USB NIC are WANs handed to
# NetworkManager so van-failover can steer them (mirrors wayback where NM owns
# all WANs): wlan0 = wifi uplink (Wapana at home / campsite wifi), eth0 =
# ethernet uplink, enxd8ec5eeb3512 = Starlink. The AP radios and
# the wired LAN port (USB dongles, wlx*/enx* MAC-named) are deliberately absent:
# systemd-networkd/hostapd own them, and van-ap-unmanaged.conf hides them from NM.
# Apply once by hand: netplan generate && netplan apply (flaps both uplinks).
# The WANs handed to NetworkManager so van-failover can steer them (mirrors
# wayback where NM owns all WANs): wlan0 = wifi uplink (Wapana at home /
# campsite wifi), enxd8ec5eeb3512 = Starlink. The AP radios and the wired LAN
# ports (USB dongle + onboard eth0, since 2026-07-12 an internal LAN port) are
# deliberately absent: systemd-networkd/hostapd own them, and
# van-ap-unmanaged.conf hides them from NM.
# Apply once by hand: netplan generate && netplan apply (flaps the uplinks).
network:
version: 2
ethernets:
eth0:
renderer: NetworkManager
optional: true
dhcp4: true
# Starlink dish uplink (RTL8153 USB NIC, MAC-named — travels with the
# adapter). The /32 link route keeps the dish's management address reachable
# no matter which WAN holds the default route: the dish answers on