Re: [LARTC] can anyone help me to solve this problem?

["Folke Aeon" <aeon_folke@hotmail.com>]

Thanks Werner, :)

  i still want to know whether i can mark the
dscp at the ingress qdisc or not , for if i cannot
do this , then at the egress qdisc i still have
no dscp to use . :(




>From: Werner Almesberger <wa@almesberger.net>
>To: Folke Aeon <aeon_folke@hotmail.com>
>CC: Subject: Re: [LARTC] can anyone help me to solve this problem?
>Date: Fri, 25 Oct 2002 14:39:14 -0300
>
>Folke Aeon wrote:
> > BUT my trouble is , since i also use have to
> > direct all packets into mpls layer , i cannot
> > do the dscp marking at the egress . because
> > the mpls header is added at the step immediately
> > after the packet passes through system routing
> > table.
>
>You can explicitly classify on the DSCP, i.e. without using
>tcindex. If you need to explicitly skip the MPLS header,
>you may use a construct like this:
>
>field mpls_hdr = raw if meta_protocol = ETH_P_MPLS; /* or whatever */
>field ip_hdr = mpls_hrd[4]; /* skip shim header */
>
>...
>     do_whatever if ip_dscp = some_value;
>...
>
> > on the packet. i cannot setup proper filter
> > based on the index value marked at the ingress.
> > thought i still not quite sure whether it is
> > because of the mpls header that influences my
> > purpose,
>
>That's odd, yes. If MPLS clears skb->tc_index, that would be
>a bug.
>
>- Werner
>
>--
>   
>_________________________________________________________________________
>  / Werner Almesberger, Buenos Aires, Argentina         wa@almesberger.net 
>/
>/_http://www.almesberger.net/____________________________________________/
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