LARTC - Apr 2002 - Has TC can act as a filter with IPv6 Flow Label ?

Hi all,
    Suppose I have two IPv6 flows, one's flowlabel is 0 ,the other's is
not 0 . Can I make a filter which filte with the flowlabel?

-Scottin


Beauty is our Business .
         -----Dijkstra

Hi,
Thank u for giving me the advice.
> Scottin wrote:
> >     Suppose I have two IPv6 flows, one's flowlabel is 0 ,the
other's is
> > not 0 . Can I make a filter which filte with the flowlabel?
> 
> Something like this ought to work (completely untested, of course):
> 
> tc filter add dev eth0 parent 1:0 protocol ipv6 prio 1 u32 \
>   match u32 0x0 0xfffff at 0 classid 1:1
I think it could  work.But if  I do match on IPv6 Flowlabel ,I think it should
be :

tc filter add dev eth0 parent 1:0 protocol ipv6 prio 1 u32 \
match u32 0x0 0x000fffff at 0 classid 1:1

for the IPv6 header's first 4 bits is the Version field and following 8 bit
is the TC field.


What is tcng? I haven't heard about it.

 
> Or you could use tcng, where it then becomes:
> 
> field ipv6_flowlabel = raw[0].nl & 0xfffff;
> 
> prio {
>     class (1) if ipv6_flowlabel == 0;
> }
> 
> You have to tweak the output and change "ip" to "ipv6"
in this
> case, though, because tcng doesn't really support IPv6 at the
> moment.
> 
> - Werner
> 
> --
>   _________________________________________________________________________
>  / Werner Almesberger, Buenos Aires, Argentina     werner@almesberger.net /
> /_http://icapeople.epfl.ch/almesber/_____________________________________/
> 
> _______________________________________________
> Diffserv-general mailing list
> Diffserv-general@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/diffserv-general
> 

-Scottin
____
Beauty is our Business .
               -----Dijkstra

----- Original Message ----- 
From: "Werner Almesberger" <wa@almesberger.net>
To: "Scottin" <scottin1980@hotmail.com>
Cc: "lartc" <lartc@mailman.ds9a.nl>;
"diffserv-general" <diffserv-general@lists.sourceforge.net>
Sent: Friday, April 26, 2002 4:36 PM
Subject: Re: [Linux Diffserv] Has TC can act as a filter with IPv6 Flow Label ?

> Scottin wrote:
> > > tc filter add dev eth0 parent 1:0 protocol ipv6 prio 1 u32 \
> > >   match u32 0x0 0xfffff at 0 classid 1:1
> >
> > I think it could  work.But if  I do match on IPv6 Flowlabel ,I think
it should be :
> >
> > tc filter add dev eth0 parent 1:0 protocol ipv6 prio 1 u32 \
> > match u32 0x0 0x000fffff at 0 classid 1:1
> 
> 0xfffff equals 0x000fffff, lo and behold, even in iproute2/tc :-)
Yeah,yeah...My fool :-)
> So if this is all you've changed, either version should work.
> 
> > What is tcng? I haven't heard about it.
> 
> tcng ("Traffic Control, Next Generation") is a revision of the
> traffic control infrastructure. One of its features is a more
> human-friendly configuration language.
> 
> It's at  http://tcng.sourceforge.net
Ok,I will browse it later . I had thought it is a kind of API ;-)
> 
> - Werner
> 
> --
>   _________________________________________________________________________
>  / Werner Almesberger, Buenos Aires, Argentina         wa@almesberger.net /
> /_http://icapeople.epfl.ch/almesber/_____________________________________/
>