iptables and dmesg
 

Hello. This is my first time installing Linux. I got iptables set up with logging level 6. I also added kern.info to syslog.conf. Now, I get the iptables logs in my file that I want of /var/log/iptables, but the same logs also appear when I type dmesg. If I look at the dmesg in /var/log, it does not containg any of the iptable information. Is there a way to keep the iptables info from showing up when I type dmesg?

Thanks!
Ryan

kern.info -/var/log/iptables

# Log anything (except mail) of level info or higher.
# Don't log private authentication messages!
*.info;mail.none;authpriv.none;cron.none;kern.none /var/log/messages

# The authpriv file has restricted access.
authpriv.* /var/log/secure

# Log all the mail messages in one place.
mail.* -/var/log/maillog


# Log cron stuff
cron.* /var/log/cron

# Everybody gets emergency messages
*.emerg *

# Save news errors of level crit and higher in a special file.
uucp,news.crit /var/log/spooler

# Save boot messages also to boot.log
local7.* /var/log/boot.log

Hi Ryan,

And welcome to LQ! :)


Not really, the output of the command dmesg is the content
of the kernels ring-buffer... if you log iptables messages, they
will show in the buffer ...


Cheers,
Tink

Is there a way to filter dmesg at all? I guess I need to know what the dmesg log in /var/log/dmesg is, and how does it compare to the dmesg command? I read that dmesg reads message from the kernel... so I assume that kernel messages are the only messages in dmesg? Is there any function or code to filter these? Is the dmesg logged somewhere by default? I guess if I'm worried about missing kernel messages because of iptables logs, i could just log all kernel info to a file and grep in or out ip tables log when appropriate. Just trying to determine if this is the standard way or not.

Thanks again!
Ryan

You wouldn't miss anything ... dmesg reads a BUFFER.
Anything that is in there is being written to the relevant
logs, e.g. /var/log/messages, /var/log/debug, /var/log/syslog,

/var/log/dmesg is just the status of dmesg when the box
reaches it's selected initial runlevel, 3 in my case.


Cheers,
Tink

Thanks Tink!