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→iptables troubleshooting procedure
= iptables troubleshooting procedure =
By now you've probably figured out that a simple mistake in your iptables rules can have very serious and unexpected consequencesfor not just your services but any network connectivity. There's a process you can follow to figure out what'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.
