---

mkdir -p /etc/net/ifaces/gre1
cat > /etc/net/ifaces/gre1/options << 'EOF'
TYPE=iptun
TUNTYPE=gre
TUNLOCAL=172.16.4.2
TUNREMOTE=172.16.5.2
BOOTPROTO=static
EOF
echo "10.0.0.1/30" > /etc/net/ifaces/gre1/ipv4address

systemctl restart network
ip link set gre1 up