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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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deploy.sh
+4 -2
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@@ -1,8 +1,9 @@
#!/usr/bin/env bash
# Deploy vanlink configs/scripts (Pi 4 "wan" port) to their system locations.
# Usage: cd ~/vanlink && sudo ./deploy.sh
# Idempotent. Netplan (onboard eth0+wlan0 = NM-managed WANs) is NOT touched here —
# reference copy in ap/50-van-wan.yaml, applied once manually (apply flaps uplinks).
# Idempotent. Netplan (wlan0 + Starlink NIC = NM-managed WANs; eth0 is a LAN
# port on br0) is NOT touched here — reference copy in ap/50-van-wan.yaml,
# applied once manually (apply flaps uplinks).
set -euo pipefail
cd "$(dirname "$(readlink -f "$0")")"
[ "$(id -u)" = 0 ] || { echo "Run with sudo (writes to /etc, /usr)."; exit 1; }
@@ -24,6 +25,7 @@ install -D -m0644 ap/10-van-ap.network /etc/systemd/network/10-van-ap.netwo
install -D -m0644 ap/20-van-br0.netdev /etc/systemd/network/20-van-br0.netdev
install -D -m0644 ap/21-van-br0.network /etc/systemd/network/21-van-br0.network
install -D -m0644 ap/22-van-lan.network /etc/systemd/network/22-van-lan.network
install -D -m0644 ap/23-van-lan-eth0.network /etc/systemd/network/23-van-lan-eth0.network
install -D -m0644 ap/van-ap-unmanaged.conf /etc/NetworkManager/conf.d/van-ap-unmanaged.conf
install -D -m0644 ap/nftables.conf /etc/nftables.conf
install -D -m0644 ap/regdomain.service /etc/systemd/system/regdomain.service