Iptables logging under Debian

Mike Waychison mike-DlQxw/23Tq2aMJb+Lgu22Q at public.gmane.org
Tue Dec 30 20:06:27 UTC 2003

Walter Dnes wrote:
>   I do want to log them, but only to file, not to
> console.  I'm using log-level 6, like so...
> [0:0] -A UNSOLICITED -j LOG --log-prefix "UNSOLICITED:" --log-level 6
>   The manpage is totally useless.  I presume I have to use a different
> log-level, but which one ?

You need to turn down the kernel's logging to the console.  This is done 
by the kernel.printk sysctl or by writing to the four values to 
/proc/sys/kernel/printk :

echo "5 4 1 5" > /proc/sys/kernel/printk

Where the numbers signify:

(first) - The current minimum loglevel to actually show on the console 
(minimum really meaning maximum in that it will print loglevels 1-5 in 
the example above).

(second) - the default level of kernel printks that don't specify a loglevel

(third) - the minimum level to log to the console when syslog disables 
console logging.

(fourth) - the minimum level to log to the console when syslog reenables 
console logging

If you still wanted some other 'info' messages to show up on the 
console, then you could manually configure them via /etc/syslog.conf (or 
however your next-gen logger is configured).


Mike Waychison
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