IPFilter section in Handbook needs updating
fbsd1 at a1poweruser.com
Sat Dec 6 19:04:51 PST 2008
G magicman wrote:
> And incomplete yes i agree that the doc does need to be updated and examples (more) need to be added.
> --- On Fri, 12/5/08, Dean Weimer <dweimer at orscheln.com> wrote:
> From: Dean Weimer <dweimer at orscheln.com>
> Subject: IPFilter section in Handbook needs updating
> To: freebsd-questions at freebsd.org
> Date: Friday, December 5, 2008, 10:07 AM
> I was just setting up ipfilter and ipmon on a FreeBSD 7 server, and noticed that
> the ipmon and syslog information under the ipfilter section of the handbook is
> The section reads:
> 31.5.7 IPMON Logging
> Syslogd uses its own special method for segregation of log data. It uses
> special groupings called "facility" and "level". IPMON in
> -Ds mode uses security as the "facility" name. All IPMON logged data
> goes to security The following levels can be used to further segregate the
> logged data if desired:
> LOG_INFO - packets logged using the "log" keyword as the action
> rather than pass or block.
> LOG_NOTICE - packets logged which are also passed
> LOG_WARNING - packets logged which are also blocked
> LOG_ERR - packets which have been logged and which can be considered short
> To setup IPFILTER to log all data to /var/log/ipfilter.log, you will need to
> create the file. The following command will do that:
> # touch /var/log/ipfilter.log
> The syslog function is controlled by definition statements in the
> /etc/syslog.conf file. The syslog.conf file offers considerable flexibility in
> how syslog will deal with system messages issued by software applications like
> Add the following statement to /etc/syslog.conf:
> security.* /var/log/ipfilter.log
> The security.* means to write all the logged messages to the coded file
> To activate the changes to /etc/syslog.conf you can reboot or bump the syslog
> task into re-reading /etc/syslog.conf by running /etc/rc.d/syslogd reload
> Do not forget to change /etc/newsyslog.conf to rotate the new log you just
> created above.
> In trying to configure this I found that ipmon -Dsa doesn't log to
> security, but logs to local0 instead. Reading the man page for ipmon does in
> fact state this. However it also list the -L option as being able to change
> this default behavior, I tried ipmon -DSa -L security, it excepts this, but
> doesn't actually change the logging to use security. It still only outputs
> to the syslog using local0, I also tried using ipmon -DSa -L local7 as well,
> still outputs to local0. It was easy enough to modify my syslog.conf to output
> the local0.* as well as security.* to the /var/log/security file. However it
> would be greatly appreciated if someone that actually understands what's
> going on here could get this info updated. It would have saved me some time, as
> well as I am sure some other people in the future. Of course it's always
> possible I am missing something simple here that is causing this discrepancy,
> please do inform me if I did. It's probably worth mentioning that I am
> starting ipmon using the rc.conf file with ipmon_enable="YES" and
> ipmon_flags="-DSa", just in case the /etc/rc.d/ipmon script actually
> changes the default behavior of ipmon in some way, though I didn't see
> anything in it that should. And ps wwaux | grep ipmon does display the process
> running with the flags exactly as stated on the ipmon_flags line of the
> /etc/rc.conf file.
> Dean Weimer
> Network Administrator
> Orscheln Management Co
I wrote that whole firewall handbook section. How is the following for
complete replacement of the 31.5.7 IPMON Logging section?
31.5.7 IPMON Logging
Syslogd uses its own special method for segregation of log data. It uses
special groupings called ‘facility’ and ‘level’. IPMON in –Ds mode uses
local0 as the ‘facility’ name. All IPMON logged data goes to local0.
You have to manually configure the /etc/syslog.conf file by adding the
statements to direct the Local0 'facility' to the log file name
recording the log records. FBSD keeps all of its syslog files in
First allocate the new named log file for the IPFMON logged data.
touch /var/log/ipfilter.log # will allocate the file
The syslog function is controlled by definition statements in the
You will have to edit the /etc/syslog.conf file.
Add the following statement to syslog.conf:
The local0.* means to write all the logged messages to the coded file
To activate the changes to /etc/syslog.conf you can reboot or bump the
syslog task into re-reading /etc/syslog.conf by kill –HUP pid. You get
the pid (IE: process number) by listing the tasks with the ps ax
command. Find syslog in the display and the pid number is the number in
the left column.
Don’t forget to change /etc/newsyslog.conf to rotate the new named
IPFILTER log you just created above.
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