[LARTC] Re: Queries

[Stef Coene <stef.coene@docum.org>]

On Wednesday 30 January 2002 05:01, Arindam Haldar wrote:
> hi all,
> hi stef,
>
> stef i went thru the site www.docum.org & would really like to thank u
> on one part--->monitor.pl.. :-).. havent tried it yestreday but will
> today when i find time but reading it i know that ... :-)
> 1) comming accros 2 one of the pages -->
> www.docum.org/stef.coene/qos/tests/cbq/splitting/weight/splitting-weight.ht
>ml ..i saw these 4 lines & got curious 2know y ur sending pkts with mark of
> 1 & 2 to both classes 10:2 & 20:10 ?..wont there b confusion 2 what rulesse
> 2b applied?
> tc filter add $DEV parent 10: protocol ip prio 3 handle 1 fw classid
> 10:2
> tc filter add $DEV parent 10: protocol ip prio 3 handle 2 fw classid
> 10:2
> tc filter add $DEV parent 20: protocol ip prio 3 handle 1 fw classid
> 20:10
> tc filter add $DEV parent 20: protocol ip prio 3 handle 2 fw classid
> 20:20
The filters are attached to different parents.  So when a packets enters 10:, 
it's matched.  If it has mark 1 it's sended to class 10:2.  But qdisc 20: is 
attached to 10:2 so the packet is matched to the filter that puts the packet 
in 20:10.  This test was to see how you have to attach the filters.  But it's 
not recommended to use more then 1 qdisc in your setup.

> 2) our linux box does managemnt of public lan(office ) & pvt
> lan(cable)--by ip's.. sucess with public ips, marking & using tc filter
> is sucessful but not true with pvt ips (10 series, marking part!).. to
> let u know better here is what we did with public ip..
>  iptables -t mangle -A PREROUTING -i eth1 -s <a.b.c.0/26> -d
> <a.b.e.0/25> -j MARK --set-mark 90
>  iptables -t mangle -A PREROUTING -i eth0 -d <a.b.c.0/26> -s
> <a.b.e.0/25> -j MARK --set-mark 91
>  the tc commands
>  tc filter add dev eth0 parent 1:105 pfifo limit 2
>  tc filter add dev eth1 parent 2:105 pfifo limit 2
> This works fine--tested with different traffic loads of download&
> upload.
> BUT with lan on eth4 which has pvt ip range(10series) vr not sucesful.
> the problem is how to make sure that the pkts detination for 10.0.0.0/8
> should be marked as they r MASQUERADEd. so i trired to mark with
> FORWARD/OUTPUT/POSTROUTING but unsuccesful. tc -s class.... etc command
> doesnt show any data being passed thru the class while iptables -nvL -t
> mangle shows pkts r being marked & passing thru.
>
> 3) do we need to reset/restart the iptables script when iproute script
> is reapplied or vice versa ?
Nop.

Stef

-- 

stef.coene@docum.org
 More QOS info : http://www.docum.org/
 Title : "Using Linux as bandwidth manager"
     
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