iptables error (No chain/target/match by that name)

[michaeljoser]

Hi i am running an iptable command on my Debian box with kernel 2.6.9-023stab040.1-entnosplit #1 SMP.

the command is:
sudo iptables -t nat -A PREROUTING -p tcp -d ip.here.aaa.bbb --dport 3724 -j REDIRECT --to-ports 3724

but i get this error:
iptables: No chain/target/match by that name

anyone can tell me why and how to fix please?

[Lazydog]

First question I have is why are you redirecting port 3724 to 3724?
Second question is what is it that you are trying to do?

[michaeljoser]

well, basically i read this on a World of Warcraft forum where we modify packets on port 3724 (wow port) in such a way to reduce latency.

The two following commands work together to achieve the above but i get errors from the first command.

we could probably send packets from 3724 -> 3725 then socat from 3725 -> 3724.


sudo iptables -t nat -A PREROUTING -p tcp -d ip.here.aaa.bbb --dport 3724 -j REDIRECT --to-ports 3724

sudo socat -d -d -d TCP4-LISTEN:3724,nodelay,fork,reuseaddr,su=nobody TCP4:ip.here.aaa.bbb:3724,nodelay

[Lazydog]

Using redirect does nothing but add latency as the packet needs to be handled.

If you are looking to remove latency then you should not be modifying anything and sending the packet direct to the port they need to goto.

Could you post the link to where you found this? I would like to take a look.

[michaeljoser]

Most people who tested says that it does reduce the latency because blizzard uses some weird network algorithm.

So here is the link:
WoW Forums -> International Lower Ping HOWTO + Observations


But my original question is why do i get the error?