# Root qdisc is prio with 3 bands
tc qdisc add dev ppp0 root handle 1: prio bands 3

# Band 1 qdisc is sfq and filter is ICMP & SSH & DNS & outbound HTTP
tc qdisc add dev ppp0 parent 1:1 sfq perturb 16
tc filter add dev ppp0 parent 1: protocol ip prio 1 u32 match ip protocol 1 0xff flowid 1:1
tc filter add dev ppp0 parent 1: protocol ip prio 1 u32 match ip sport 22 0xffff flowid 1:1
tc filter add dev ppp0 parent 1: protocol ip prio 1 u32 match ip dport 22 0xffff flowid 1:1
tc filter add dev ppp0 parent 1: protocol ip prio 1 u32 match ip sport 53 0xffff flowid 1:1
tc filter add dev ppp0 parent 1: protocol ip prio 1 u32 match ip dport 53 0xffff flowid 1:1
tc filter add dev ppp0 parent 1: protocol ip prio 1 u32 match ip sport 80 0xffff flowid 1:1

# Band 2 qdisc is sfq and filter is anything unfiltered
tc qdisc add dev ppp0 parent 1:2 sfq perturb 16
tc filter add dev ppp0 parent 1: protocol ip prio 9 u32 match u8 0 0 flowid 1:2

# Band 3 qdisc is tbf and filter is outbound SMTP
tc qdisc add dev ppp0 parent 1:3 tbf rate 128kbit buffer 100000 latency 100s
tc filter add dev ppp0 parent 1: protocol ip prio 1 u32 match ip dport 25 0xffff flowid 1:3