shaping ftp traffic

[nix4me <nix4me@xxxxxxxxxx>]

I am trying to mark outbound passive ftp traffic with iptables and shape 
it to 35KBytes.  I am using the following script on the computer that 
runs the ftp server.

It is not working correctly, it seems to limit ALL traffic.  Cant file 
share or anything.

Anyone might know what is wrong?  It seems that I might need to add a 
'lan limit' so all traffic that is not marked still runs at 100mbit.  I 
cant quite decipher the docs to do this.

#!/bin/bash
#shaping passive ftp traffic

# mark the outbound passive ftp packets on ports 50000-51000
iptables -t mangle -D POSTROUTING -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 POSTROUTING -o eth0 -j MYSHAPER-OUT

iptables -t mangle -A MYSHAPER-OUT -p tcp --dport 50000:51000 -j MARK 
--set-mark 1

# shape the traffic to 35Kbytes
tc qdisc del dev eth0 root
tc qdisc add dev eth0 root handle 1: htb
tc class add dev eth0 parent 1: classid 1:1 htb rate 35kbps
tc filter add dev eth0 parent 1:  prio 0 protocol ip handle 1 fw flowid 1:1
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