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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/20-van-br0.netdev
+4 -3
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@@ -1,6 +1,7 @@
# LAN bridge: joins the AP Wi-Fi (added by hostapd, once it's in AP mode) and the
# wired LAN port (enx00e04c331140, added by networkd) into one 10.42.0.0/24 segment.
# STP off: only two member ports, no loops, and it avoids the forwarding delay that
# LAN bridge: joins the AP Wi-Fi radios (added by hostapd, once in AP mode) and the
# wired LAN ports (enx00e04c331140 + onboard eth0, added by networkd) into one
# 10.42.0.0/24 segment. STP off: all members are leaf ports, no loops (don't cable
# the two wired ports to the same switch), and it avoids the forwarding delay that
# would otherwise stall the first DHCP handshake on a freshly-plugged client.
[NetDev]
Name=br0