Hello there,
iptables is an application that allows users to configure specific rules that will be enforced by the kernel’s netfilter framework. It acts as a packet filter and firewall that examines and directs traffic based on port, protocol and other criteria
Different network protocols provide specialized matching options which can be configured to match a particular packet using that protocol. However, the protocol must first be specified in the iptables command. For example -p tcp <protocol-name> (where <protocol-name> is the target protocol), makes options for the specified protocol available
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