Re: DSCP, ToS and Egress

[Dan Cox <dan@xxxxxxx>]

I would post my scripts but they're around several thousand lines, intertwined
with lots of variable substitution and generate about 300 qdiscs and 
classes so
I don't think it would be easy to follow :)

I'm using stock Fedora Core 3 packages for kernel (2.6.10), iptables and
iproute2 (2.6.9) with the QNET patchset applied
(http://kem.p.lodz.pl/~peter/qnet/). I've also done this under Gentoo with the
same stock kernels, packages and patches.

Basically, I sort traffic into several different HTB classes based on 
protocol,
then I have 4 levels of priority subclasses under each protocol, with yet
another 4 levels of subpriorities under those. IPTables helps here by MARKing
the packets so I know which priority subclass to sort them into. Then I use an
HTB + diffserv combo on these leaf priority subclasses to apply GRED for
AF1-AF4 and apply RED for BE (not using EF yet).

Here is an organizational snippet with 1 protocol priority level:
|root DSMARK qdisc
|root DSMARK bit mask filters
|HTB main qdisc
|HTB main class
|HTB main filters (sort based on protocol into subs)
 |HTB UDP Protocol Subclass
 |HTB UDP Protocol Subclass filters (sort based on MARK value into subs)
  |HTB UDP Priority 1 Subclass
  |HTB UDP Priority 1 filters (apply DSMARK bit mask for sorting into subs)
   |HTB AF1 Class
    |GRED qdisc
   |HTB AF2 Class
    |GRED qdisc
   |HTB AF3 Class
    |GRED qdisc
   |HTB AF4 Class
    |GRED qdisc
   |HTB BE Class
    |RED qdisc

There's a great site with lots of examples and info:
http://www.opalsoft.net/qos/DS.htm

Hope that helps-
Dan-

Quoting Antonios Halkiopoulos <alg0@xxxxxxxxxxxxxxxxx>:

> On Tue, 15 Feb 2005, Dan Cox wrote:
>
>
> > > I'm successfully using HTB + GRED to shape traffic based on the DSCP field.
>
> I am investigationg WHY HTB + GRED does not work on my test beds. In 
> SuSe 9.1 , 9.2 and Debian testing with 2.6.8 and 2.4.27 i face LOTS 
> of problems (actually GRED works partially).
>
> Can you sent me your scripts and mention the version's of the kernel 
> and iproute2 you are currently using?
>
> Thanks in advance for your time,
> Antonios Chalkiopoylos
>
> My only working configuration is vanilla kernel 2.4.20 (patched with HTB)



-- Dan-

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