[LARTC] howto mark packet's dscp value

[LARTC] howto mark packet's dscp value

[Philip Ho]

Dear all

can anyone tell me how to mark packet's DSCP value using tc?

Thanks.

Regards,
philip






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Re: [LARTC] howto mark packet's dscp value

[Alexander Trotsai]

On Thu, Mar 13, 2003 at 03:56:48PM +0800, Philip Ho wrote:
PH>Dear all

PH>can anyone tell me how to mark packet's DSCP value using tc?

You must use iptable not tc
iptable -t mangle -A <chain> <conditions> -s DSCP --set-dscp <num>

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Re: [LARTC] howto mark packet's dscp value

[Maria Joana Urbano]

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>
>can anyone tell me how to mark packet's DSCP value using tc?
>

Hi,

You can use the dsmark qdisc. Something like (example):

tc qdisc add dev $DEV handle 1:0 root dsmark indices 64 set_tc_index
(...)
tc class change $DEV parent 1:0 classid 1:1 dsmark 0x3 value 0xb8 # EF
(...)
tc filter add dev $DEV parent 1:0 prio 4 u32 ip dst y.y.y.y classid 1:1

This way, packets going to y.y.y.y get EF mark.


Iproute2 packages comes with some examples. The "Differentiated Services on 
Linux" draft by Almesberger, Jamal and Alexey Kuznetsov is another good 
source, including commented and easy to understand examples.

Regards,
Joana Urbano


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Re: [LARTC] howto mark packet's dscp value

[Philip Ho]

Dear Joana

I guess dsmark qdisc is runned before iptables PREROUTING phase, right?

Regards,
philip

Maria Joana Urbano wrote:

> >
> >can anyone tell me how to mark packet's DSCP value using tc?
> >
>
> Hi,
>
> You can use the dsmark qdisc. Something like (example):
>
> tc qdisc add dev $DEV handle 1:0 root dsmark indices 64 set_tc_index
> (...)
> tc class change $DEV parent 1:0 classid 1:1 dsmark 0x3 value 0xb8 # EF
> (...)
> tc filter add dev $DEV parent 1:0 prio 4 u32 ip dst y.y.y.y classid 1:1
>
> This way, packets going to y.y.y.y get EF mark.
>
> Iproute2 packages comes with some examples. The "Differentiated Services on
> Linux" draft by Almesberger, Jamal and Alexey Kuznetsov is another good
> source, including commented and easy to understand examples.
>
> Regards,
> Joana Urbano
>
>   ------------------------------------------------------------------------
>
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> Outgoing mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.459 / Virus Database: 258 - Release Date: 25-02-2003

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Re: [LARTC] howto mark packet's dscp value

[Maria Joana Urbano]

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Hi Philip,


>I guess dsmark qdisc is runned before iptables PREROUTING phase, right?
>

Hummm, I actually use dsmark after all iptables hooks, at the QoS Egress, 
just before the packet leaves the interface (please see KPTD at www.docum.org).

Probably you can do it before the routing code, using the IMQ, but I 
haven't try it and I am not sure if this is possible...

Regards,
Joana Urbano



> > >
> > >can anyone tell me how to mark packet's DSCP value using tc?
> > >
> >
> > Hi,
> >
> > You can use the dsmark qdisc. Something like (example):
> >
> > tc qdisc add dev $DEV handle 1:0 root dsmark indices 64 set_tc_index
> > (...)
> > tc class change $DEV parent 1:0 classid 1:1 dsmark 0x3 value 0xb8 # EF
> > (...)
> > tc filter add dev $DEV parent 1:0 prio 4 u32 ip dst y.y.y.y classid 1:1
> >
> > This way, packets going to y.y.y.y get EF mark.
> >
> > Iproute2 packages comes with some examples. The "Differentiated Services on
> > Linux" draft by Almesberger, Jamal and Alexey Kuznetsov is another good
> > source, including commented and easy to understand examples.
> >
> > Regards,
> > Joana Urbano
> >