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Firewall filtering rules are grouped together in chains. It allows a packet to be matched against one common criterion in one chain, and then passed over for processing against some other common criteria to another chain. For example a packet should be matched against the IP address:port pair.
We strongly suggest keeping the default firewall on. Here are a few adjustments to make it more secure. Make sure you configure additional changes when you completely understand the benefit of these particular firewall rules. To see the default firewall rules through the CLI you can type:
