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(ADM).
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.
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).
-f <device>
specify an alternative device/file from which to read the log information
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 <device>
Set the logfile to be opened for reading NAT log records from to
<device>.
-n
IP addresses and port numbers will be mapped, where possible, back into
hostnames and service names.
-N <device>
Set the logfile to be opened for reading NAT log records from to
<device>.
-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.
-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:
-S <device>
Set the logfile to be opened for reading state log records from to
<device>.
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
Treat the logfile as being composed of state log records.
-t
read the input file/device in a manner akin to
tail(C).
-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 consistant with how it
should be
saved and will abort if it fails an assertion which detects an anomoly
in the recorded data.