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==INVESTIGATION 1: IPTABLES TROUBLESHOOTING CHECKLIST==
By now , you've have probably figured out discovered that a simple mistake in your iptables rules can have very serious and unexpected consequences for not just only your services , but any the network connectivityin general. There's is a general process (checklist) that you can follow following to help troubleshoot iptables in order to fix the problem. '''Refer to figure out whatthe following IPTABLES Troubleshooting Checklist:'''s wrong.
# First figure out if you network is set up correctly. You can use the [http://zenit.senecac.on.ca/wiki/index.php/OPS335_Lab_1#Linux_Network_Connection_Configuration_Troubleshooting steps in lab 1] as a guide, but keep in mind the firewall may be blocking pings and DNS requests.
