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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/23-van-lan-eth0.network
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# Onboard GbE (RP1 eth0) as the internal LAN port: enslaved to br0 so anything
# plugged in lands on 10.42.0.0/24 with DHCP/DNS from the same dnsmasq as Wi-Fi
# clients. Was the metric-150 ethernet WAN until 2026-07-12 — with wifi +
# Starlink + cellular as uplinks, the wired port earns its keep as LAN instead.
# NM must leave it alone (see van-ap-unmanaged.conf) for networkd to own it here.
[Match]
Name=eth0
[Link]
RequiredForOnline=no
[Network]
Bridge=br0