Iptables Command Switch
Each line of an iptables script not only has a jump, but they also have a number of command line options that are used to append rules to chains that match your defined packet characteristics, such the source IP address and TCP port.
If you don’t specify a table, then the filter table is assumed. The possible built-in tables include: filter, nat, mangle
-j ‘target’
Jump to the specified target chain when the packet matches the current rule.
-A
Append rule to end of a chain
-F
Flush. Deletes all the rules in the selected table
-p ‘protocol-type’
Match protocol. Types include, icmp, tcp, udp, and all
-s ‘ip-address’
Match source IP address
-d ‘ip-address’
Match destination IP address
-i ‘interface-name’
Match “input” interface on which the packet enters.
-o ‘interface-name’
Match “output” interface on which the packet exits
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