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48.9.3.6. Listing Options

The default list command, iptables -L [<chain-name>], provides a very basic overview of the default filter table's current chains. Additional options provide more information:
  • -v — Displays verbose output, such as the number of packets and bytes each chain has processed, the number of packets and bytes each rule has matched, and which interfaces apply to a particular rule.
  • -x — Expands numbers into their exact values. On a busy system, the number of packets and bytes processed by a particular chain or rule may be abbreviated to Kilobytes, Megabytes (Megabytes) or Gigabytes. This option forces the full number to be displayed.
  • -n — Displays IP addresses and port numbers in numeric format, rather than the default hostname and network service format.
  • --line-numbers — Lists rules in each chain next to their numeric order in the chain. This option is useful when attempting to delete the specific rule in a chain or to locate where to insert a rule within a chain.
  • -t <table-name> — Specifies a table name. If omitted, defaults to the filter table.
The following examples illustrate the use of several of these options. Note the difference in the byte display by including the -x option. 
~]# iptables -L OUTPUT -v -n -x
Chain OUTPUT (policy ACCEPT 64005 packets, 6445791 bytes)
    pkts      bytes target     prot opt in     out     source               destination
    1593   133812 ACCEPT     icmp --  *      *       0.0.0.0/0            0.0.0.0/0

~]# iptables -L OUTPUT -v -n
Chain OUTPUT (policy ACCEPT 64783 packets, 6492K bytes)
    pkts bytes target     prot opt in     out     source               destination
    1819  153K ACCEPT     icmp --  *      *       0.0.0.0/0            0.0.0.0/0
~]#
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