interfaces.d for CAKE traffic shaping on cable modem (1G/100M)

interfaces.d-wan0

auto wan0
iface wan0 inet dhcp
        bridge_ports enp9s0 enp4s0f1
        #bridge_hw 00:11:22:33:44:55
        nameserver 127.0.0.1

        # CAKE / Uplink shaping
        post-up tc qdisc add dev enp9s0 root cake bandwidth 80Mbit docsis nat ack-filter
        pre-down tc qdisc del dev enp9s0 root

        # CAKE / Downlink shaping
        post-up ip link add name ifb4uplink type ifb
        post-up tc qdisc add dev enp9s0 handle ffff: ingress
        post-up tc qdisc add dev ifb4uplink root cake bandwidth 950Mbit besteffort wash nat docsis
        post-up ip link set ifb4uplink up
        post-up tc filter add dev enp9s0 parent ffff: protocol all prio 10 u32 match u32 0 0 flowid 1:1 action mirred egress redirect dev ifb4uplink
        pre-down tc filter del dev enp9s0 parent ffff:
        pre-down tc qdisc del dev enp9s0 ingress
        pre-down ip link del ifb4uplink

iface wan0 inet6 dhcp
        request_prefix 1
        # Accept SLAAC even if forwarding is enabled (router)
        accept_ra 2
        #dhcp 1