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Indice de la Documentación
Load Balancing with multiple ISP1. Define the local subnets on local interface with following commands #ifconfig eth0 192.168.0.1 netmask 255.255.255.0 #ifconfig eth0:0 172.16.0.1 netmask 255.255.255.0 #ifconfig eth0:1 172.16.1.1 netmask 255.255.255.0 2. Assume that your two wan interfaces are eth1 and eth2 respectively. Give ips to eth1 and eth2. #ifconfig eth1 210.211.251.189 netmask 255.255.255.224 #ifconfig eth2 192.168.1.253 netmask 255.255.255.224 5. If you want to load balance the traffic with 1:1 ratio , give command, #ip route add default equalize nexthop via 210.211.251.1 dev eth1 nexthop via 192.168.1.1 dev eth2 6. Add two routing tables to your load balance server. #echo table1 > /etc/iproute2/rt_tables #echo table2 > /etc/iproute2/rt_tables Table1 wil be used for defining default route for ISP1 and table2 will be used for defining default route or ISP2. 7.Next step is to make rules to tell your load balance server which subnet will go which way, #ip rule add from 210.211.251.189 lookup table1 #ip rule add from 192.168.1.253 loookp table2 #ip rule add from 172.16.0.0/24 lookup table1 #ip rule add from 172.16.1.0/24 lookup table2 8. Add routes for local subnets. #ip route add 192.168.0.1/24 via 192.168.0.1 table1 #ip route add 192.168.0.1/24 via 192.168.0.1 table2 #ip route add 172.16.0.1/24 via 172.16.0.1 table 1 #ip route add 172.16.1.1/24 via 172.16.1.1 table 2 9. Add default route in respective tables #ip route add default via 210.211.251.189 table1 #ip route add default via 192.168.1.1 table2 10 Add natting rules #iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE #iptables -t nat -A POSTROUTING -o eth2 -j MASQUEARDE . ============================================================================================================================ failover Script : 12. Add failover script #vi failover #!/bin/bash PATH=/sbin:/usr/bin:/bin; gw1=210.211.251.189 gw2=192.168.1.1 gateway_1_down () { echo " DOWN $gw1" ip rule delete from 172.16.0.0/24 table gipl ip rule delete from 172.16.1.0/24 table icenet ip route delete default route add -net 0.0.0.0 netmask 0.0.0.0 gw 210.211.251.1 ip route flush cache iptables -t nat -F iptables -t nat -A POSTROUTING -o eth2 -j MASQUERADE service iptables save service iptables restart sleep 1m failover_start return } gateway_2_down () { echo "DOWN $gw2" ip rule delete from 172.16.0.0/24 table gipl ip rule delete from 172.16.1.0/24 table icenet ip route delete default route add -net 0.0.0.0 netmask 0.0.0.0 gw 192.168.1.1 ip route flush cache iptables -t nat -F iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE service iptables save service iptables restart sleep 1m failover_start return } resume_gw () { echo "starting sequence when both ISPs are up" sh rules echo "Rules Loaded" sh routes echo "Routes Loaded" sh snat echo "Natting Rules Loaded" failover_start return } failover_start () { if ( ping -c5 -t5 $gw1 | grep -q "100% packet loss" ) ; then gateway_1_down elif ( ping -c5 -t5 $gw2 | grep -q "100% packet loss" ) then gateway_2_down elif ( ping -c5 -t5 $gw1 | grep -q "0% packet loss" && ping -c5 -t5 $gw2 | grep -q "0% packet loss" ) then { echo "Both ISPs are up" ip rule list > /etc/rules } if( diff -b /etc/rules /etc/sysconfig/rules ); then failover_start else echo "Calling Function Resume_gw" resume_gw fi return fi } failover_start Indice de la Documentación |
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