ACTIVE/ACTIVE Transparent Firewall

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http://www.linuxquestions.org – Hello everyone, I am using Ubuntu Server 12.04. I am working on a Transparent Firewall configuration. I need to configure an ACTIVE/ACTIVE firewall configuration, using iptables. The two firewalls will get traffic, and the job of dividing the traffic is done by Openflow switches. When one of the firewall fails, the other firewall invokes a script to do certain tasks. My question is, how can i achieve the ACTIVE/ACTIVE firewall configuration? Thank You (HowTos)