It works. But the result is not what i expected. The system/kernel-logs were already logged in messages and bootmessages.
I read the man-page after i read the first post to understand what the cryptic line means. Now give me another hint and explain me where
i can log or find the ip adresses which wanted to access my pc sniffing etc. Let me compare to ZoneAlarm. There is always a list/log where you can look at if someone tried to breach your pc. port/protocol. Does iptables log something in the same way ?
I have installed snort too. Iam still reading. I think this one does something similar and can be linked to iptables so that snort does the work. Which is not what i want right now. It's only an where is the message if there is one from iptables.
Thank you.