LARTC - Dec 2002 - questions with Stef''s scripts

Hi, Stef,

I have some questions with your following scripts on www.docum.org, 

BW1=$1''kbps''
BW2=`expr 100 - $1`
BW2=$BW2''kbps''

tc qdisc del dev eth0 root handle 1:

tc qdisc add dev eth0 root handle 1: htb default 12
tc class add dev eth0 parent 1: classid 1:1 htb rate 100kbps ceil 100kbps burst
2k
tc class add dev eth0 parent 1:1 classid 1:10 htb rate $BW1 ceil 100kbps burst
2k
tc class add dev eth0 parent 1:1 classid 1:11 htb rate $BW2 ceil 100kbps burst
2k

tc filter add dev eth0 parent 1: protocol ip prio 3 handle 1 fw classid 10:10
tc filter add dev eth0 parent 1: protocol ip prio 3 handle 2 fw classid 10:11

iptables -F
iptables -X
iptables -N acc_0
iptables -N acc_1
iptables -A OUTPUT -t mangle -p tcp --dport 2000 -j MARK --set-mark 1
iptables -A OUTPUT -t mangle -p tcp --dport 2001 -j MARK --set-mark 2
iptables -A OUTPUT -p tcp --dport 2000 -j acc_0
iptables -A OUTPUT -p tcp --dport 2001 -j acc_1
	
My questions are as follow,
1.Why the classid in tc filter are "10:10 and 10:11" instead of
"1:10 and 1:11"? How can
you associate the filters with the classes you defined before?
2.What does "fw" before "classid" in tc filter mean? Does it
refer to forward chain?
3.I guess the "handle 1" in tc filter refer to "mark1" in
iptables, am I right? But is
there any sequence problem to define handle 1 first and mark1 later in the
scripts?
4.Where can I find procedure on how to install HTB and compile kernel to use it?

Your answer will be much appreciated,


Regards,
 
James

On Thursday 05 December 2002 23:36, James Ma wrote:
> Hi, Stef,
>
> I have some questions with your following scripts on www.docum.org,
>
> BW1=$1''kbps''
> BW2=`expr 100 - $1`
> BW2=$BW2''kbps''
>
> tc qdisc del dev eth0 root handle 1:
>
> tc qdisc add dev eth0 root handle 1: htb default 12
> tc class add dev eth0 parent 1: classid 1:1 htb rate 100kbps ceil 100kbps
> burst 2k tc class add dev eth0 parent 1:1 classid 1:10 htb rate $BW1 ceil
> 100kbps burst 2k tc class add dev eth0 parent 1:1 classid 1:11 htb rate
> $BW2 ceil 100kbps burst 2k
>
> tc filter add dev eth0 parent 1: protocol ip prio 3 handle 1 fw classid
> 10:10 tc filter add dev eth0 parent 1: protocol ip prio 3 handle 2 fw
> classid 10:11
>
> iptables -F
> iptables -X
> iptables -N acc_0
> iptables -N acc_1
> iptables -A OUTPUT -t mangle -p tcp --dport 2000 -j MARK --set-mark 1
> iptables -A OUTPUT -t mangle -p tcp --dport 2001 -j MARK --set-mark 2
> iptables -A OUTPUT -p tcp --dport 2000 -j acc_0
> iptables -A OUTPUT -p tcp --dport 2001 -j acc_1
>
> My questions are as follow,
> 1.Why the classid in tc filter are "10:10 and 10:11" instead of
"1:10 and
> 1:11"? How can you associate the filters with the classes you defined
> before?
Because I did a wrong copy ''n paste :)
Where have you found that scripts so I can corrrect it ?
> 2.What does "fw" before "classid" in tc filter mean?
Does it refer to
> forward chain? 
No to firewall.  Fw is a filter that uses the marks you placed on packets with 
firewall commands like iptables or ipchains.
> 3.I guess the "handle 1" in tc filter refer to "mark1"
in
> iptables, am I right? But is there any sequence problem to define handle 1
> first and mark1 later in the scripts? 
No, the filtering is done when the packet is sended out on the wire, so long 
after the iptables rules are processed.
> 4.Where can I find procedure on how
> to install HTB and compile kernel to use it?
Kernel 2.4.20 has htb support.  You only need to patch iproute2 for htb 
support.  Or go to www.docum.org, I placed a tc binary online on the faq 
page.

Stef

-- 

stef.coene@docum.org
 "Using Linux as bandwidth manager"
     http://www.docum.org/
     #lartc @ irc.oftc.net

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