Hi

You can do the load balancing with iptables. However it is little complicated, here are quick links to get started:

http://www.linux.com.lb/wiki/index.p...ltiple%20Links
http://linux-ip.net/html/adv-multi-internet.html
http://tetro.net/misc/multilink.html

However if you have large setup; it is best if you opt for hardware based router

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