From mboxrd@z Thu Jan  1 00:00:00 1970
From: ro0ot <ro0ot@phreaker.net>
Date: Tue, 18 Jan 2005 14:34:06 +0000
Subject: Re: [LARTC] failover works - but balancing does not
Message-Id: <41ED1E5E.3080707@phreaker.net>
List-Id: <lartc.vger.kernel.org>
References: <be7468bb0501172320480bff51@mail.gmail.com>
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To: lartc@vger.kernel.org

Hi,

Can I know how is your failover works?  Any additional scripts?

Regards,
ro0ot


roderick tapang wrote:

>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_IP2.168.0.101
># Internal Subnet
>NET_INT_SUB=/24
># Internal Network
>NET_INT_NET2.168.0.0
># First external interface
>NET_EXT_INT1=eth0
># First external IP
>NET_EXT_IP12.168.1.7
># First external interface's gateway
>NET_EXT_GW12.168.1.1
># Second external interface
>NET_EXT_INT2=eth2
># Second external IP
>NET_EXT_IP22.168.1.3
># Second external interface's gateway
>NET_EXT_GW22.168.1.1
>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>
>
>  
>



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