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Tables firewall d
iptables is a packet filter, or firewall in common terms. And yes, that is what you need in order to allow or deny traffic from reaching your server. There's no "securing" packets per se, as iptables does nothing to the packet content (it does not encrypt/decrypt).
iptables management is a faily large subject, I suggest you get yourself some reading material.
This is a good starting primer :
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Iptables for securing the packets is that right
IPTables does secure your server, you can create all kind of different configurations wich will provide you security in different sections. But mainly its a firewall for network traffic (Ports, IP's etc.)
Now i understand about IPTables