Firestarter firewall and connection sharing

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http://www.linuxquestions.org – I am trying to set up a computer to act as a firewall/gateway on my network, and am using the Firestarter program to do this. Everything appears to be set up correctly, and I followed the instructions on their website completely, and I get an error message when I try to start the firewall. It says that eth0 (my internal NIC) isn't ready, and to make sure it's active. I'm not sure why it isn't working. Any help would be greatly appreciated. (HowTos)