administration tool for IPv4 packet filtering and NAT

-A, --append chain rule-specification
       Append one or more rules to the end of the selected chain.  When  the  source  and/or  destination
       names  resolve  to  more  than  one  address,  a  rule  will  be  added  for each possible address
       combination.

[!] -i, --in-interface name
       Name of an interface via which a packet was received (only for packets entering the INPUT, FORWARD
       and PREROUTING chains).  When the "!" argument is used before the interface  name,  the  sense  is
       inverted.   If  the  interface  name ends in a "+", then any interface which begins with this name
       will match.  If this option is omitted, any interface name will match.

-j, --jump target
       This  specifies the target of the rule; i.e., what to do if the packet matches it.  The target can
       be a user-defined chain (other than the one this rule is in), one of the special  builtin  targets
       which  decide the fate of the packet immediately, or an extension (see EXTENSIONS below).  If this
       option is omitted in a rule (and -g is not used), then matching the rule will have  no  effect  on
       the packet's fate, but the counters on the rule will be incremented.

Commands separated  by  a ; are executed sequentially; the shell waits for each command to terminate in turn.  The
return status is the exit status of the last command executed.