[root@nto2 ~]# iptables -Viptables v1.4.21

[root@nto2 ~]# iptables --helpiptables v1.4.21
Usage: iptables -[ACD] chain rule-specification [options]
       iptables -I chain [rulenum] rule-specification [options]
       iptables -R chain rulenum rule-specification [options]
       iptables -D chain rulenum [options]
       iptables -[LS] [chain [rulenum]] [options]
       iptables -[FZ] [chain] [options]
       iptables -[NX] chain
       iptables -E old-chain-name new-chain-name
       iptables -P chain target [options]
       iptables -h (print this help information)
Commands:
Either long or short options are allowed.
--append-A chain  Append to chain
--check-C chain  Check for the existence of a rule
--delete-D chain  Delete matching rule from chain
--delete-D chain rulenum
    Delete rule rulenum (1 = first) from chain
--insert-I chain [rulenum]
    Insert in chain as rulenum (default 1=first)
--replace-R chain rulenum
    Replace rule rulenum (1 = first) in chain
--list-L [chain [rulenum]]
    List the rules in a chain or all chains
--list-rules-S [chain [rulenum]]
    Print the rules in a chain or all chains
--flush-F [chain]  Delete all rules in  chain or all chains
--zero-Z [chain [rulenum]]
    Zero counters in chain or all chains
--new-N chain  Create a new user-defined chain
--delete-chain-X [chain]  Delete a user-defined chain
--policy-P chain target
    Change policy on chain to target
--rename-chain-E old-chain new-chain
    Change chain name, (moving any references)
Options:
--ipv4-4  Nothing (line is ignored by ip6tables-restore)
--ipv6-6  Error (line is ignored by iptables-restore)
[!] --protocol-p proto  protocol: by number or name, eg. `tcp'[!] --source  -s address[/mask][...]    source specification[!] --destination -d address[/mask][...]    destination specification[!] --in-interface -i input name[+]    network interface name ([+] for wildcard) --jump -j target    target for rule (may load target extension)  --goto      -g chain                              jump to chain with no return  --match -m match    extended match (may load extension)  --numeric -n  numeric output of addresses and ports[!] --out-interface -o output name[+]    network interface name ([+] for wildcard)  --table -t table  table to manipulate (default: `filter')  --verbose -v  verbose mode  --wait  -w [seconds]  maximum wait to acquire xtables lock before give up  --wait-interval -W [usecs]  wait time to try to acquire xtables lock    default is 1 second  --line-numbers  print line numbers when listing  --exact -x  expand numbers (display exact values)[!] --fragment  -f  match second or further fragments only  --modprobe=<command>  try to insert modules using this command  --set-counters PKTS BYTES set the counter during insert/append[!] --version -V  print package version.