LARTC - Feb 2006 - Conceptual question ;-)

ehlo list,

I''m willing to shape ppp users e.g. each pppX interface to get XXX
kbits
I classify traffic going to ppp+ interfaces like this:
iptables -t mangle -A POSTROUTING -o ppp+ -j CLASSIFY --set-class 0002:0020

then i have a file which is executed when a ppp inteface is up and first
argument parsed to that file ($1) is the ppp number (e.g. 35 for ppp35).
it generally looks like this:

tc qdisc del dev ppp$1 root
tc qdisc add dev ppp$1 root handle 2: htb
tc class add dev ppp$1 parent 2: classid 2:2 htb rate XXXkbit
tc class add dev ppp$1 parent 2:2 classid 2:20 htb rate XXXkbit
tc qdisc add dev ppp$1 parent 2:20 handle 20: sfq perturb 10

The question is, when for example 10 ppp interfaces are up will they
each get XXX kbits.

-- 
regards,
Georgi Alexandrov

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Jody Shumaker wrote:
> I don''t believe -j CLASSIFY targte can target sub-classes.  Pretty
> sure you can only target classes whose parent is the root class of the
> qdisc. You would need to use tc filters to do this, or get rid of your
> redundant classes.  For THB for some reason you have a root class and
> a child class with the same limit? This makes no sense, you''d be
fine
> with just the 2:2 class and attaching the sfq to that, and setting the
> classify to that.
> 
> Otherwise, yes I think this would work in setting a limit on those ppp
> devices as they come up to XXXkbit of bandwidth.
> 
> - Jody
Actually it looks like it can target sub-classes:

pppoe users ----- eth1-gw/router-eth0 ----- WAN/Internet

For shaping pppoe users upload i do the following:
attached a root qdisc to eth0
then attached a htb class to it (1:10 for example)

Then i attach dynamicaly classes to 1:10 with numbers (1:91 for ppp1 for
example) with parent 1:10. There are also dynamic iptables rules (alot
of dynamic stuff going on .. lol ;) saying "traffic from that pppoe user
going out trough eth0 CLASSIFY as 1:91"
When a ppp43 is up, a class 1:943 with parent 1:10 will be attached to
eth0 and iptables rule saying traffic from that pppoe user going out
trough eth0 CLASSIFY as 1:943"

and it seems to work fine, upload seems to be shaped at the desired rates.
But that is in a "one pppoe user" test environment, i think it should
work fine when deployed too, and each pppoe user will get their upload
rates ;-)


-- 
regards,
Georgi Alexandrov

Key Server = http://pgp.mit.edu/ :: KeyID = 37B4B3EE
Key Fingerprint = E429 BF93 FA67 44E9 B7D4  F89E F990 01C1 37B4 B3EE



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