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CentOS 6.4 kvm iptables rules & nat creation

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http://www.linuxquestions.org – I am trying to understand where/how the extra ip chains get created when you install kvm and create virtual machines and networks. I have the following networks created for testing purposes and studying: default was 192.168.122.0/24 added 192.168.100.0/24 added 192.168.200.0.24 From the default /etc/sysconfig/iptables rules: # Firewall configuration written by system-config-firewall # Manual customization of this file is not recommended. *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT -A INPUT -p icmp -j ACCEPT (HowTos)