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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