iptables -t nat -A PREROUTING -i pronc -p tcp --dp

iptables -t nat -A PREROUTING -i pronc -p tcp --dp

iptables v1.3.3

Usage: iptables -[AD] chain rule-specification [options]

iptables -[RI] chain rulenum rule-specification [options]

iptables -D chain rulenum [options]

iptables -[LFZ] [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
--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]

List the rules in a chain or all chains
--flush
-F [chain]

Delete all rules inchain or all chains
--zero
-Z [chain]

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:
--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
--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
[!] --version
-V

print package version.