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Description: How to shape packets using IFB and sharing bandwidth between
	multiple interfaces, with lot's of comments.
Author: Catalin(ux) M. BOIE 
Date: 2014-10-15
Web: http://kernel.embedromix.ro/
Version: 0.1


Let's assume the following:

- You have a router (router1) that has some pppoe connections and eth0
	to internet.
- You want to use HTB to limit traffic towards this pppoe interfaces,
	sharing the bandwidth between them.
- Let's assume 2.2.2.0/24 on pppoe interfaces.

Please note:
- From pppoe devices to outside, you use normal egress limiting support.


How to do it:

# We preapre ifb0, this is where shaping of packets from eth0 to pppoeX will
# take place.
tc qdisc del dev ifb0 root
tc qdisc add dev ifb0 root handle 1: htb default 2000
tc class add dev ifb0 parent 1: classid 1:1 htb rate 800kbit

# this is for 2.2.2.1
tc class add dev ifb0 parent 1:1 classid 1:21 htb rate 30kbit
# this is for 2.2.2.2
tc class add dev ifb0 parent 1:1 classid 1:22 htb rate 30kbit
# and so on

# default
tc class add dev ifb0 parent 1:1 classid 1:2000 htb rate 100kbit

# Now, come filters
tc filter add dev ifb0 parent 1: protocol ip prio 1 u32 \
	match ip dst 2.2.2.1/32 flowid 1:21
tc filter add dev ifb0 parent 1: protocol ip prio 1 u32 \
	match ip dst 2.2.2.2/32 flowid 1:22
# and so on
# VERY IMPORTANT TO UNDERSTAND ifb: packets will go back to interface
# they come from, here eth0.


# Add on ingress a redirect to ifb0
tc qdisc del dev eth0
tc qdisc del dev eth0 ingress
tc qdisc add dev eth0 ingress
# Please ignore "flow 1:10", it doesn't count.
tc filter add dev eth0 parent ffff: protocol ip prio 1 u32 \
	match ip dst 2.2.2.0/24 flowid 1:10 \
	action mirred egress redirect dev ifb0