1. Edit the file /usr/local/etc/syslog-ng/syslog-ng.conf

At the bottom of the file, add:

filter f_routers { facility(local5); };
log {
        source(src);
        filter(f_routers);
        destination(routers);
};
destination routers {
 file("/var/log/network/$YEAR/$MONTH/$DAY/$HOST-$YEAR-$MONTH-$DAY-$HOUR.log"
 owner(root) group(root) perm(0644) dir_perm(0755) create_dirs(yes)
 template("$YEAR $DATE $HOST $MSG\n"));
};

2. Create the directory /var/log/network/

	# mkdir /var/log/network/

3. Restart syslog-ng:

	# /usr/local/etc/rc.d/syslog-ng restart

4. See if messages are starting to appear under

	/var/log/network/2009/02/21/...