Re: [LARTC] How to use tc to limit bandwidth of a special IP in LAN

From: "Manfred Bartz" <md-lartc@logi.cc>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] How to use tc to limit bandwidth of a special IP in LAN
Date: Tue, 12 Jun 2001 09:39:32 +0000	[thread overview]
Message-ID: <marc-lartc-99233895629789@msgid-missing> (raw)
In-Reply-To: <marc-lartc-99233276410622@msgid-missing>

Chuanbo Xu <iproute2@btamail.net.cn> writes:

> I want to limit bandwidth of a special IP in LAN, when it upload or
> download from Internet through Linux server. How to use tc to do?

The HOWTO covers this quite well:
        <http://www.linuxdoc.org/HOWTO/Adv-Routing-HOWTO.html>
but there were two hiccups I encountered:
1. with "tc class" the priority must be no more than 8
2. with "tc filter" the priority must be no more than 99

Here is my setup (shortened), modify to suit:

## ROOT Class
tc qdisc add dev eth2 root handle 12: cbq bandwidth 10Mbit avpkt 1400

tc class add dev eth2 parent 12: classid 12:1 cbq bandwidth 10Mbit \
   rate 10Mbit allot 1514 weight 1Mbit prio 2 maxburst 20 avpkt 1400

## FLOWs
# 192.168.2.12 (unbounded)
tc class add dev eth2 parent 12:1 classid 12:212 cbq bandwidth 10Mbit \
   rate 256Kbit allot 1514 weight 25Kbit prio 5 maxburst 20 avpkt 1400

# 192.168.2.13 (bounded)
tc class add dev eth2 parent 12:1 classid 12:213 cbq bandwidth 10Mbit \
   rate 64Kbit allot 1514 weight 6Kbit prio 5 maxburst 20 avpkt 1400 bounded

# unbounded class for local traffic
tc class add dev eth2 parent 12:1 classid 12:300 cbq bandwidth 10Mbit \
   rate 3Mbit allot 1514 weight 300Kbit prio 3 maxburst 20 avpkt 1400

## QDISCs
tc qdisc add dev eth2 parent 12:212 sfq quantum 1514b perturb 15
tc qdisc add dev eth2 parent 12:213 sfq quantum 1514b perturb 15
tc qdisc add dev eth2 parent 12:300 sfq quantum 1514b perturb 15

## FILTERs
# unbounded class (local)
tc filter add dev eth2 parent 12:0 protocol ip prio 10 u32 \
   match ip src 192.168.2.0/24  flowid 12:300

# bounded classes (Internet)
tc filter add dev eth2 parent 12:0 protocol ip prio 20 u32 \
   match ip dst 192.168.2.12 flowid 12:212
tc filter add dev eth2 parent 12:0 protocol ip prio 20 u32 \
   match ip dst 192.168.2.13 flowid 12:213

I have only limited downloads.  To cover uploads as well you need to 
do the same thing for that direction.

-- 
Manfred
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