Re: good tutorial

[Andrew Beverley <andy@andybev.com>]

On Sat, 2011-02-05 at 17:48 +0100, J Webster wrote:
> Does anyone have a tutorial recommendation for tc?
> I tried the existing tutorials on LARTC and they were all lacking 
> examples - also the pages look like they were written 10 years ago.
> I want to limit bandwidth per ip address on my server.

If you check the archives there's a discussion going on right now about
this...

You can use a classful qdisc such as HTB, create a leaf for each IP
address, then filter into that leaf using the U32 filters.

Something like this (untested - I've only copied from the list
archives):


tc qdisc add dev eth0 root handle 1: htb r2q 1
tc class add dev eth0 parent 1:0  classid 1:1 htb \
	rate 3000kbit ceil 3000kbit

tc class add dev eth0 parent 1:1 classid 1:100 htb \
	rate 1500kbit ceil 1500kbit prio 3
tc filter add dev eth0 parent 1: protocol ip u32 \
	match ip dst 172.16.254.1/32 classid 1:100
tc qdisc add dev eth0 parent 1:100 handle 100: sfq perturb 2

tc class add dev eth0 parent 1:1 classid 1:101 htb \
	rate 1500kbit ceil 1500kbit prio 3
tc filter add dev eth0 parent 1: protocol ip u32 \
	match ip dst 172.16.254.2/32 classid 1:101
tc qdisc add dev eth0 parent 1:101 handle 101: sfq perturb 2

...


You'll need a leaf class for each IP address, and all the leaf classes
should add up to the parent.

By the way - please start a new email when starting a new thread. If you
reply to a previous email and change the subject then your email will
still appear in the original thread in the message archives.

Andy