Hi there, i am going to explain you my setup and post you my scripts in
case they are of any help to anybody :)
This mail is a little long, but i think the only way you can undestandme
is writing you my whole code..
1.- I have to ADSL connections connected through ehternet cards eth0 and
eth1 to the routers
-Both ADSL are 2Mbit downsteam / 300kbit upstream
-eth2 goes to my 200 users LAN.
2.- I am doing load balancing (that works great)
3.- I have a mail and web server redirected to eth0's ADSL.
4.- My QoS setup attached to eth0 and eth1
1 Qdisc for high-priority traffic (mark 1)
1 Qdisc for low-priority traffic (mark 2)
1 Qdisc for SYN,ACK traffic (mark 3)
1 Qdisc for ICMP traffic (mark 4)
1 Qdisc for Web-server traffic (mark 5)
->Scripts below
5.- Since i am doing load balancing i have a stateful firewall as
explained in Nano HOWTO
->Firewall scripts below
6.- Use the mangle table to mark packets and redirect them to the Qdisc
Let me explain my reasoning:
I want to mark interactive traffic like HTTP,SMTP,etc to
mark 1
Mark DNS traffic and MSN Messenger(dport 1863) to
interactive High priority mark 1
Mark p2p programs with the ipp2p module to mark p2p
programs to mark 2
(dport 1214 is Imesh)
In order to make sure ACKS and SYN traffic is going out
propperly i have an special qdisc
If any traffic is unmarked, mark it as low-priority
->Mangle setup below
---->PROBLEM:
The problem comes after having this setup running for an hour or so,
when interactive traffic has VERY HIGH latency, or nearly dIES.
Anybody having mor or less a similar setup, because i am driving mad
here!
Any suggestions are welcome :) Thank you very much!!!!!
My BOX is an athlon 900MHz with 1GB ram:
cat /proc/sys/net/ipv4/ip_conntrack_max
57336
txqueuelen on all eth cards is 100.
----> SCRIPTS
IPTABLES MANGLE Table
iptables -t mangle -A POSTROUTING -j CONNMARK --restore-mark
iptables -t mangle -A POSTROUTING -m mark ! --mark 0 -j ACCEPT
iptables -t mangle -A POSTROUTING -p icmp -j MARK --set-mark 4
iptables -t mangle -A POSTROUTING -p udp --dport 53 -j MARK
--set-mark 1
iptables -t mangle -A POSTROUTING -p udp -j MARK --set-mark 2
iptables -t mangle -A POSTROUTING -p tcp -m ipp2p --ipp2p -j MARK
--set-mark 2
iptables -t mangle -A POSTROUTING -m string --string 'KazaaClient'
-j MARK --set-mark 2
iptables -t mangle -A POSTROUTING -p tcp --dport 0:1024 -j MARK
--set-mark 1
iptables -t mangle -A POSTROUTING -p tcp --dport 1214 -j MARK
--set-mark 2
iptables -t mangle -A POSTROUTING -p tcp --dport 1863 -j MARK
--set-mark 1
iptables -t mangle -A POSTROUTING -j CONNMARK --save-mark
iptables -t mangle -A POSTROUTING -p tcp --tcp-flags SYN,ACK,RST SYN
-j MARK --set-mark 3
iptables -t mangle -A POSTROUTING -p tcp -m tcp --tcp-flags
SYN,RST,ACK ACK -j chkack
iptables -t mangle -A POSTROUTING -m mark ! --mark 0 -j MARK
--set-mark 2
Script for QoS attached to eth0
#!/bin/bash
DEV=eth0
tc qdisc add dev ${DEV} handle 1: root htb default 10
tc class add dev ${DEV} parent 1:1 classid 1:1 htb rate 250kbit
######################################
## Interactive traffic
tc class add dev ${DEV} parent 1:1 classid 1:10 htb rate 100kbit
ceil 250kbit
tc qdisc add dev ${DEV} parent 1:10 handle 10: pfifo
tc filter add dev ${DEV} protocol ip parent 1:0 handle 1 fw
flowid 1:10
#######################################
# Non Interactive Traffic
tc class add dev ${DEV} parent 1:1 classid 1:20 htb rate 50kbit
ceil 200kbit quantum 1500
tc qdisc add dev ${DEV} parent 1:20 handle 20: esfq perturb 10
depth 15
tc filter add dev ${DEV} protocol ip parent 1:0 handle 2 fw
flowid 1:20
########################################
## SYN,ACK Traffic
tc clas add dev ${DEV} parent 1:1 classid 1:30 htb rate 45kbit
ceil 250kbit quantum 1500
tc qdisc add dev ${DEV} parent 1:30 handle 30: pfifo
tc filter add dev ${DEV} protocol ip parent 1:0 handle 3 fw
flowid 1:30
########################################
## ICMP Traffic
tc class add dev ${DEV} parent 1:1 classid 1:40 htb rate 5kbit
quantum 1500
tc qdisc add dev ${DEV} parent 1:40 handle 40: pfifo
tc filter add dev ${DEV} protocol ip parent 1:0 handle 4 fw
flowid 1:40
########################################
## Web-Server Traffic
tc class add dev ${DEV} parent 1:1 classid 1:50 htb rate 50kbit
ceil 200kbit quantum 1500
tc qdisc add dev ${DEV} parent 1:50 handle 50: esfq hash dst
perturb 10 depth 15
tc filter add dev ${DEV} protocol ip parent 1:0 handle 5 fw
flowid 1:50
Script for QoS attached to eth1
#!/bin/bash
DEV=eth1
tc qdisc add dev ${DEV} handle 1: root htb default 10
tc class add dev ${DEV} parent 1:1 classid 1:1 htb rate 250kbit
########################################
## Interactive Traffic
tc class add dev ${DEV} parent 1:1 classid 1:10 htb rate 100kbit
ceil 250kbit
tc qdisc add dev ${DEV} parent 1:10 handle 10: pfifo
tc filter add dev ${DEV} protocol ip parent 1:0 handle 1 fw
flowid 1:10
#######################################
# Non Interactive Traffic
tc class add dev ${DEV} parent 1:1 classid 1:20 htb rate 100kbit
ceil 200kbit quantum 1500
tc qdisc add dev ${DEV} parent 1:20 handle 20: esfq perturb 10
depth 15
tc filter add dev ${DEV} protocol ip parent 1:0 handle 2 fw
flowid 1:20
########################################
## SYN,ACK Traffic
tc class add dev ${DEV} parent 1:1 classid 1:30 htb rate 50kbit
ceil 250kbit quantum 1500
tc qdisc add dev ${DEV} parent 1:30 handle 30: pfifo
tc filter add dev ${DEV} protocol ip parent 1:0 handle 3 fw
flowid 1:30
#tc filter add dev ${DEV} parent 1:0 protocol ip u32 match ip
protocol 6 0xff match u8 0x05 0x0f at 0 match u8 0x34 0xff at 3 match u8
0x10 0xff at 33 flowid 1:30
########################################
## ICMP Traffic
tc class add dev ${DEV} parent 1:1 classid 1:40 htb rate 5kbit
quantum 1500
tc qdisc add dev ${DEV} parent 1:40 handle 40: pfifo
tc filter add dev ${DEV} protocol ip parent 1:0 handle 4 fw
flowid 1:40
Firewall setup
####################################################
## Stateful Firewall
##
##
##
iptables -t filter -N keep_state
iptables -t filter -A keep_state -m state --state
RELATED,ESTABLISHED -j ACCEPT
iptables -t filter -A keep_state -j RETURN
iptables -t nat -N keep_state
iptables -t nat -A keep_state -m state --state
RELATED,ESTABLISHED -j ACCEPT
iptables -t nat -A keep_state -j RETURN
iptables -t nat -A PREROUTING -j keep_state
iptables -t nat -A POSTROUTING -j keep_state
iptables -t nat -A OUTPUT -j keep_state
iptables -t filter -A INPUT -j keep_state
iptables -t filter -A OUTPUT -j keep_state
iptables -t filter -A FORWARD -j keep_state
iptables -t filter -A FORWARD -p tcp --dport 4661:4662 -j DROP
iptables -t filter -A FORWARD -p udp --dport 4661:4662 -j DROP
iptables -t filter -A FORWARD -p udp --dport 1663 -j DROP
iptables -t filter -A FORWARD -p udp --dport 4665 -j DROP
iptables -t filter -A FORWARD -p tcp --dport 4665 -j DROP
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