From mboxrd@z Thu Jan  1 00:00:00 1970
From: nix4me <nix4me@cfl.rr.com>
Date: Sat, 04 Mar 2006 00:00:00 +0000
Subject: [LARTC] my shaping rules wont work on nat box
Message-Id: <4408D880.4060100@cfl.rr.com>
List-Id: <lartc.vger.kernel.org>
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To: lartc@vger.kernel.org

I am currently running the following script on an internal machine to 
shape outbound ftp and email traffic.

I am trying to move the script to my nat router (ipcop with 2 nic cards) 
so that it shapes the whole network and not only the outbound of 1 box.

I have cable modem -> ipcop (eth1) >(eth0 - 192.168.1.1)  > 
192.168.1.100 and 192.168.1.101.

The scripts works great running on 192.168.1.101.  But I cannot get it 
to work on either of the ipcop interfaces.

Does it have something to do with NAT ?

Script:
#!/bin/bash
#shaping passive and active outbound ftp traffic on an internal computer 
without affecting inbound and lan speed

# mark the outbound passive ftp packets on ports 50000-51000
iptables -t mangle -D OUTPUT -o eth0 -j MYSHAPER-OUT 2> /dev/null > 
/dev/null
iptables -t mangle -F MYSHAPER-OUT 2> /dev/null > /dev/null
iptables -t mangle -X MYSHAPER-OUT 2> /dev/null > /dev/null
iptables -t mangle -N MYSHAPER-OUT
iptables -t mangle -I OUTPUT -o eth0 -j MYSHAPER-OUT
# mark packets: 20 is lan traffic, 26 is active ftp and passive ftp, 30 
is ACK for downloads, 35 is email
iptables -t mangle -A MYSHAPER-OUT -m mark --mark 0 -j MARK --set-mark 20
iptables -t mangle -A MYSHAPER-OUT -p tcp --sport 59999 -j MARK 
--set-mark 26
iptables -t mangle -A MYSHAPER-OUT -p tcp --sport 50000:51000 -j MARK 
--set-mark 26
iptables -t mangle -A MYSHAPER-OUT -p tcp -m length --length :64 -j MARK 
--set-mark 30
iptables -t mangle -A MYSHAPER-OUT -m tcp -p tcp --dport 25 -j MARK 
--set-mark 35
# clear it
tc qdisc del dev eth0 root

#add the root qdisk
tc qdisc add dev eth0 root handle 1: htb default 20

#add main rate limit class
tc class add dev eth0 parent 1: classid 1:1 htb rate 100mbit

#add leaf classes, 1:2 is lan, 1:3 is outbound max
tc class add dev eth0 parent 1:1 classid 1:2 htb rate 100mbit
tc class add dev eth0 parent 1:1 classid 1:3 htb rate 40kbps
# 1:31 is ftp with lower prio, 1:32 is ACk AND email higher prio
tc class add dev eth0 parent 1:3 classid 1:31 htb rate 1kbps ceil 40kbps 
prio 2
tc class add dev eth0 parent 1:3 classid 1:32 htb rate 20kbps ceil 
40kbps prio 1

#filter traffic into classes
tc filter add dev eth0 parent 1:0  prio 0 protocol ip handle 20 fw 
flowid 1:2
tc filter add dev eth0 parent 1:0  prio 0 protocol ip handle 26 fw 
flowid 1:31
tc filter add dev eth0 parent 1:0  prio 0 protocol ip handle 30 fw 
flowid 1:32
tc filter add dev eth0 parent 1:0  prio 0 protocol ip handle 35 fw 
flowid 1:32
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