#!/bin/sh
# esh-docker-vm: route the host's traffic for macvlan children over the shim (ifupdown if-up.d hook).
#
# Home Assistant sits on a macvlan (10.0.50.46, parent ens18). A macvlan parent cannot talk to its
# own children, so the host reaches HA only through macvlan-shim (10.0.50.47, a macvlan sibling).
# The shim holds a /24, which gives TWO equal connected 10.0.50.0/24 routes; ens18's is listed first
# and wins, so host->HA traffic left via ens18 and was dropped. HA lost MQTT (the broker is on
# this host) on 2026-08-19, 2026-09-21 and 2026-09-25, the last for two days. A /32 via the shim is
# more specific than either /24, so the choice no longer depends on route order.
# Installed by playbooks/esh-docker-vm-macvlan-shim-route.yaml. Add a line per macvlan child.
[ "$IFACE" = "macvlan-shim" ] || exit 0
ip route replace 10.0.50.46/32 dev macvlan-shim   # homeassistant