Hi,
I am currently using the following script to shape traffic on my linux
box. I am getting ready to move the script to my linux firewall box so
it shapes traffic for my home lan. I am looking to refine my rules a
bit so to make bandwidth sharing a bit more efficient.
Specifically I am looking to give out bound email more priority so that
when a large email is sent, I want it to borrow all of the ftp
bandwidth. For some reason it only borrows some of the bandwidth but
not all.
Here is my 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 20kbps 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
Any comments would be greatly appreciated,
Mark
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