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ipmon(8)							     ipmon(8)



NAME
  ipmon	- monitors /dev/ipl for	logged packets

SYNOPSIS
  ipmon	[ -abDFhnpstvxX	] [ -N <&lt;device>&gt;	] [ -o [NSI] ] [ -O [NSI] ] [ -P
  <&lt;pidfile>&gt; ] [	-S <&lt;device>&gt; ] [	-f <&lt;device>&gt; ] [	<&lt;filename>&gt; ]

DESCRIPTION

  ipmon	opens /dev/ipl for reading and awaits data to be saved from the
  packet filter.  The binary data read from the	device is reprinted in human
  readable for,	however, IP#'s are not mapped back to hostnames, nor are
  ports	mapped back to service names.  The output goes to standard output by
  default or a filename, if given on the command line.	Should the -s option
  be used, output is instead sent to syslogd(8).  Messages sent	via syslog
  have the day,	month and year removed from the	message, but the time
  (including microseconds), as recorded	in the log, is still included.

  Messages generated by	ipmon consist of whitespace separated fields.  Fields
  common to all	messages are:

  1. The date of packet	receipt. This is suppressed when the message is	sent
  to syslog.

  2. The time of packet	receipt. This is in the	form HH:MM:SS.F, for hours,
  minutes seconds, and fractions of a second (which can	be several digits
  long).

  3. The name of the interface the packet was processed	on, e.g., we1.

  4. The group and rule	number of the rule, e.g., @0:17. These can be viewed
  with ipfstat -n.

  5. The action: p for passed, b for blocked,  for a short packet, n did not
  match	any rules or L for a log rule.

  6. The addresses.  This is actually three fields: the	source address and
  port (separted by a comma), the ->&gt; symbol, and the destination address and
  port.	E.g.: 209.53.17.22,80 ->&gt; 198.73.220.17,1722.

  7. PR	followed by the	protocol name or number, e.g., PR tcp.

  8. len followed by the header	length and total length	of the packet, e.g.,
  len 20 40.

  If the packet	is a TCP packet, there will be an additional field starting
  with a hyphen	followed by letters corresponding to any flags that were set.
  See the ipf.conf manual page for a list of letters and their flags.

  If the packet	is an ICMP packet, there will be two fields at the end,	the
  first	always being `icmp', and the next being	the ICMP message and submes-
  sage type, separated by a slash, e.g., icmp 3/3 for a	port unreachable mes-
  sage.

  In order for ipmon to	properly work, the kernel option IPFILTER_LOG must be
  turned on in your kernel.  Please see	options(4) for more details.



OPTIONS

  -a   Open all	of the device logfiles for reading log entries from.  All
       entries are displayed to	the same output	'device' (stderr or syslog).

  -b   For rules which log the body of a packet, generate hex output
       representing the	packet contents	after the headers.

  -D   Cause ipmon to turn itself into a daemon.  Using	subshells or back-
       grounding of ipmon is not required to turn it into an orphan so it can
       run indefinitely.

  -f <&lt;device>&gt;
       specify an alternative device/file from which to	read the log informa-
       tion for	normal IP Filter log records.

  -F   Flush the current packet	log buffer.  The number	of bytes flushed is
       displayed, even should the result be zero.

  -n   IP addresses and	port numbers will be mapped, where possible, back
       into hostnames and service names.

  -N <&lt;device>&gt;
       Set the logfile to be opened for	reading	NAT log	records	from to	<dev-
       ice>.

  -o   Specify which log files to actually read	data from.  N -	NAT logfile,
       S - State logfile, I - normal IP	Filter logfile.	 The -a	option is
       equivalent to using -o NSI.

  -O   Specify which log files you do not wish to read from.  This is most
       sensibly	used with the -a.  Letters available as	paramters to this are
       the same	as for -o.

  -p   Cause the port number in	log messages to	always be printed as a number
       and never attempt to look it up as from /etc/services, etc.

  -P <&lt;pidfile>&gt;
       Write the pid of	the ipmon process to a file.  By default this is
       //etc/opt/ipf/ipmon.pid (Solaris), /var/run/ipmon.pid (44BSD or later)
       or /etc/ipmon.pid for all others.

  -s   Packet information read in will be sent through syslogd rather than
       saved to	a file.	 The default facility when compiled and	installed is
       local0.	The following levels are used:

       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".

  -S <&lt;device>&gt;
       Set the logfile to be opened for	reading	state log records from to
       <device>.

  -t   read the	input file/device in a manner akin to tail(1).

  -v   show tcp	window,	ack and	sequence fields.

  -x   show the	packet data in hex.

  -X   show the	log header record data in hex.

DIAGNOSTICS
  ipmon	expects	data that it reads to be consistent with how it	should be
  saved	and will abort if it fails an assertion	which detects an anomaly in
  the recorded data.

FILES
  /dev/ipl
  /dev/ipnat
  /dev/ipstate
  /etc/services

SEE ALSO
  ipl(4), ipf(8), ipfstat(8), ipnat(8)

BUGS

  If you find any, please send email to	me at darrenrATpobox.com