network@.service setup

network_down.sh

#!/bin/bash
cd "$(dirname "$0")"
exec ./"$1"/down.sh "$1"

network_eth0_down.sh

#!/bin/bash
cd "$(dirname "$0")"
iface="$1"

echo "Removing unreachable route from lo..."
ip route del 2a01:4f8:190:83a8::/64 dev lo

echo "Flushing addresses..."
ip addr flush dev "$iface"

echo "Flushing routes..."
ip route flush dev "$iface"
ip -6 route flush dev "$iface"

echo "Downing interface..."
ip link set dev "$iface" down

echo "Done"

exit 0

network_eth0_up.sh

#!/bin/bash
cd "$(dirname "$0")"
iface="$1"

./down.sh "$iface"

echo "Bringing up interface ${iface}..."
ip link set dev "$iface" up

echo "Adding addresses..."
ip addr add 144.76.8.169 peer 144.76.8.161/32 dev "$iface"
ip addr add 144.76.21.59 peer 144.76.21.57/32 dev "$iface"
ip addr add 2a01:4f8:190:83a8::1/128 dev "$iface"

echo "Adding routes..."
ip route add default via 144.76.8.161 src 144.76.8.169 dev "$iface"
#ip route add default via 144.76.21.57 src 144.76.21.59 dev "$iface"
ip route add default via fe80::1 dev "$iface"

echo "Adding unreachable route to lo..."
ip route add 2a01:4f8:190:83a8::/64 dev lo

echo "Done"

exit 0

network_up.sh

#!/bin/bash
cd "$(dirname "$0")"
exec ./"$1"/up.sh "$1"

systemd_system_network@.service

[Unit]
Description=Network connectivity (%i)
Wants=network.target
Before=network.target
BindsTo=sys-subsystem-net-devices-%i.device
After=sys-subsystem-net-devices-%i.device

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/etc/network/up.sh %i
ExecStop=/etc/network/down.sh %i

[Install]
WantedBy=multi-user.target