[LARTC] cascaded HTB urgent question

[LARTC] cascaded HTB urgent question

[Osama Abu Elsorour]

Hi there,
I have a question with regards to cascading multiple HTB qdiscs. Assume
that I want to build the following hierarchy:

(qdisc htb 1:0) -> (class htb 1:1) -> (qdisc htb 2:0) -> (class htb 2:1)
						      -> (class htb 2:2)

I want to attache aggregate u32 filters at 1:0 for supernets, then at
2:0 (and 3:0, 4:0, etc), I attach the more specific u32 filters for say
HTTP and SMPT shaping.

so I attach the following filters:
tc filter add dev eth0 parent 1:0 protocol ip u32 match ip dst
	172.16.1.0/24 classid 1:1
so that all the class c traffic is directed to 1:1
then for that c class web traffic
tc filter add dev eth0 parent 2:0 protocol ip u32 match ip sport 80
	0xffff classid 2:1
then for that c class smtp traffic
tc filter add dev eth0 parent 2:0 protocol ip u32 match ip sport 25
	0xffff classid 2:2
and so on and so forth

however, when I build that setup, the c class traffic gets directed to
1:1 alright, but nothing goes nay further in 2:1 and 2:2

my reasoning could be one of the following:
1) you cannot cascade HTB qdiscs, which to me is illogical, it defies
the concept and adventages of having a hierarchical setup.
2) there is something wrong with the way I attached the filters.
3) I totally misunderstood HTB!

Please advise.

Thanks a million.



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Re: [LARTC] cascaded HTB urgent question

[Alexey Sheshka]

On 28 Apr 2003 11:50:46 +0300
Osama Abu Elsorour <osama@wayout.net> wrote:

> Hi there,
> I have a question with regards to cascading multiple HTB qdiscs. Assume
> that I want to build the following hierarchy:
> 
> (qdisc htb 1:0) -> (class htb 1:1) -> (qdisc htb 2:0) -> (class htb 2:1)
> 						      -> (class htb 2:2)
> 
> I want to attache aggregate u32 filters at 1:0 for supernets, then at
> 2:0 (and 3:0, 4:0, etc), I attach the more specific u32 filters for say
> HTTP and SMPT shaping.
> 
> so I attach the following filters:
> tc filter add dev eth0 parent 1:0 protocol ip u32 match ip dst
> 	172.16.1.0/24 classid 1:1
> so that all the class c traffic is directed to 1:1
> then for that c class web traffic
> tc filter add dev eth0 parent 2:0 protocol ip u32 match ip sport 80
> 	0xffff classid 2:1
> then for that c class smtp traffic
> tc filter add dev eth0 parent 2:0 protocol ip u32 match ip sport 25
> 	0xffff classid 2:2
> and so on and so forth
> 
> however, when I build that setup, the c class traffic gets directed to
> 1:1 alright, but nothing goes nay further in 2:1 and 2:2
> 
> my reasoning could be one of the following:
> 1) you cannot cascade HTB qdiscs, which to me is illogical, it defies
> the concept and adventages of having a hierarchical setup.
> 2) there is something wrong with the way I attached the filters.
> 3) I totally misunderstood HTB!
> 
> Please advise.
> 
> Thanks a million.
> 

AFAIK filters can be atached ONLY to leaf classes (2.1 and 2.1)

-- 
Sheshka Aleksey
Senior Security Administrator

PGP key : http://pgp.dtype.org:11371/pks/lookup?op=get&search=0x0BE90515

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Re: [LARTC] cascaded HTB urgent question

[Rob Cresswell]

You should be able to cascade these ... I did something similar awhile ago
with htb.init cause the various tc commands involved confused me :)
You can grab the script at:: http://sourceforge.net/projects/htbinit

However you can avoid htb.init if you want ...
IIRC, there's an example of using HTB in a hierachy at:
http://luxik.cdi.cz/~devik/qos/htb/manual/userg.htm

Perhaps the problem is that the classids of 2:* cannot be children
of class 1:1?  I dunno -- that is conjecture ... read the docs
instead of listening to my late-night theories :)

good luck,
-rob

On Mon, Apr 28, 2003 at 11:50:46AM +0300, Osama Abu Elsorour wrote:
> Hi there,
> I have a question with regards to cascading multiple HTB qdiscs. Assume
> that I want to build the following hierarchy:
> 
> (qdisc htb 1:0) -> (class htb 1:1) -> (qdisc htb 2:0) -> (class htb 2:1)
> 						      -> (class htb 2:2)
> 
> I want to attache aggregate u32 filters at 1:0 for supernets, then at
> 2:0 (and 3:0, 4:0, etc), I attach the more specific u32 filters for say
> HTTP and SMPT shaping.
> 
> so I attach the following filters:
> tc filter add dev eth0 parent 1:0 protocol ip u32 match ip dst
> 	172.16.1.0/24 classid 1:1
> so that all the class c traffic is directed to 1:1
> then for that c class web traffic
> tc filter add dev eth0 parent 2:0 protocol ip u32 match ip sport 80
> 	0xffff classid 2:1
> then for that c class smtp traffic
> tc filter add dev eth0 parent 2:0 protocol ip u32 match ip sport 25
> 	0xffff classid 2:2
> and so on and so forth
> 
> however, when I build that setup, the c class traffic gets directed to
> 1:1 alright, but nothing goes nay further in 2:1 and 2:2
> 
> my reasoning could be one of the following:
> 1) you cannot cascade HTB qdiscs, which to me is illogical, it defies
> the concept and adventages of having a hierarchical setup.
> 2) there is something wrong with the way I attached the filters.
> 3) I totally misunderstood HTB!
> 
> Please advise.
> 
> Thanks a million.
> 
> 
> 
> _______________________________________________
> LARTC mailing list / LARTC@mailman.ds9a.nl
> http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
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