IPTABLES

iptables -h

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)
[!] —proto -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= try to insert modules using this command
—set-counters PKTS BYTES set the counter during insert/append
[!]