[LARTC] failover works - but balancing does not

[roderick tapang <retapang@gmail.com>]

here's the setup (two dsl - same provider)

                                +-----> link1
LAN----- linux box  --|             |----------internet
                                +-----> link2

the setup is ok in terms of the failover requirement. the other link
takes over when one is down. however, there is a very noticeable lag
when both lines are up. i've tried changing the weight value to a
higher one but the links are still under utilized and some client machines
playing games or mostly disconnected. taking down one link makes the
connection ok.
any suggestions? do i need to patch the kernel?

below is the script i'm  using on a mandrake 10.1 box.

thanks.
erik

<start of script>
#!/bin/sh
# Iptables userspace executable
IPTABLES="/sbin/iptables"
# Internal Interface
NET_INT_INT=eth1
# Internal IP
NET_INT_IP\x192.168.0.101
# Internal Subnet
NET_INT_SUB=/24
# Internal Network
NET_INT_NET\x192.168.0.0
# First external interface
NET_EXT_INT1=eth0
# First external IP
NET_EXT_IP1\x192.168.1.7
# First external interface's gateway
NET_EXT_GW1\x192.168.1.1
# Second external interface
NET_EXT_INT2=eth2
# Second external IP
NET_EXT_IP2\x192.168.1.3
# Second external interface's gateway
NET_EXT_GW2\x192.168.1.1
echo "Flushing All Tables"
$IPTABLES -F
$IPTABLES -F -t nat
$IPTABLES -F -t mangle
$IPTABLES -X -t nat
$IPTABLES -X -t mangle
$IPTABLES -X

$IPTABLES -t mangle -N ETH0
$IPTABLES -t mangle -F ETH0
$IPTABLES -t mangle -A ETH0 -j MARK --set-mark 1

$IPTABLES -t mangle -N ETH2
$IPTABLES -t mangle -F ETH2
$IPTABLES -t mangle -A ETH2 -j MARK --set-mark 2

$IPTABLES -t nat -N SPOOF_ETH0
$IPTABLES -t nat -F SPOOF_ETH0"
$IPTABLES -t nat -A SPOOF_ETH0 -j SNAT --to ${NET_EXT_IP1}

$IPTABLES -t nat -N SPOOF_ETH2
$IPTABLES -t nat -F SPOOF_ETH2H2 "
$IPTABLES -t nat -A SPOOF_ETH2 -j SNAT --to ${NET_EXT_IP2}

echo "Setting some local network rules..."
$IPTABLES -A INPUT -p icmp -s ${NET_INT_NET}/24 -d ${NET_INT_IP} -j ACCEPT

echo "Setting Mangle rules for eth0..."
$IPTABLES -t mangle -A OUTPUT -o ! ${NET_INT_INT} -m random --average 50 -j ETH0
$IPTABLES -t mangle -A PREROUTING -i ${NET_INT_INT} -m random
--average 50 -j ETH0
ip ro add table 10 default via ${NET_EXT_GW1} dev ${NET_EXT_INT1}
ip ru add fwmark 1 table 10
ip ro fl ca

echo "Setting Mangle rules for eth2..."
$IPTABLES -t mangle -A OUTPUT -o ! ${NET_INT_INT} -m random --average 50 -j ETH2
$IPTABLES -t mangle -A PREROUTING -i ${NET_INT_INT} -m random
--average 50 -j ETH2
ip ro add table 20 default via ${NET_EXT_GW2} dev ${NET_EXT_INT2}
ip ru add fwmark 2 table 20
ip ro fl ca

echo "Setting up spoofing rules..."
$IPTABLES -t nat -A POSTROUTING -o ${NET_EXT_INT1} -j SPOOF_ETH0
$IPTABLES -t nat -A POSTROUTING -o ${NET_EXT_INT2} -j SPOOF_ETH2

echo "Adding default route..."
ip ro add default nexthop via ${NET_EXT_GW1} dev ${NET_EXT_INT1}
weight 1 nexthop via ${NET_EXT_GW2} dev ${NET_EXT_INT2} weight 1

echo "Disabling Reverse Path Filtering..."
echo 0> /proc/sys/net/ipv4/conf/eth0/rp_filter
echo 0> /proc/sys/net/ipv4/conf/eth2/rp_filter

echo "Enabling IPv4 Packet forwarding..."
echo "1"> /proc/sys/net/ipv4/ip_forward
<end of script>

-- 
roderick e. tapang
retapang at gmail dot com

(o_.'       http://counter.li.org/
//\         ----------------------
V_/_        Linux User   #  253842
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