SNMPTRAPD(8)							     Net-SNMP							      SNMPTRAPD(8)

NAME

       snmptrapd - Receive and log SNMP trap messages.

SYNOPSIS

       snmptrapd [OPTIONS] [LISTENING ADDRESSES]

DESCRIPTION

       snmptrapd is an SNMP application that receives and logs SNMP TRAP and INFORM messages.

       Note:  the default is to listen on UDP port 162 on all IPv4 interfaces.	Since 162 is a privileged port, snmptrapd must typically be run as
       root.

OPTIONS

       -a      Ignore authenticationFailure traps.

       -A      Append to the log file rather than truncating it.

	       Note that this needs to come before any -Lf options that it should apply to.

       -c FILE Read FILE as a configuration file.

       -C      Do not read any configuration files except the one optionally specified by the -c option.

       -d      Dump (in hexadecimal) the sent and received SNMP packets.

       -D[TOKEN[,...]]
	       Turn on debugging output for the given TOKEN(s).  Try ALL for extremely verbose output.

       -f      Do not fork() from the calling shell.

       -F FORMAT
	       When logging to standard output, use the format in the string FORMAT.   See  the  section  FORMAT  SPECIFICATIONS  below  for  more
	       details.

       -h, --help
	       Display a brief usage message and then exit.

       -H      Display a list of configuration file directives understood by the trap daemon and then exit.

       -I [-]INITLIST
	       Specifies  which  modules  should (or should not) be initialized when snmptrapd starts up.  If the comma-separated INITLIST is pre-
	       ceded with a '-', it is the list of modules that should not be started.	Otherwise this is the list of the only modules that should
	       be started.

	       To  get	a  list  of compiled modules, run snmptrapd with the arguments -Dmib_init -H (assuming debugging support has been compiled
	       in).

       -L[efos]
	       Specify where logging output should be directed (standard error or output, to a file or via syslog).  See LOGGING OPTIONS  in  snm-
	       pcmd(1) for details.

       -m MIBLIST
	       Specifies  a  colon separated list of MIB modules to load for this application.	This overrides the environment variable MIBS.  See
	       snmpcmd(1) for details.

       -M DIRLIST
	       Specifies a colon separated list of directories to search for MIBs.  This overrides the environment  variable  MIBDIRS.	 See  snm-
	       pcmd(1) for details.

       -n      Do not attempt to translate source addresses of incoming packets into hostnames.

       -p FILE Save the process ID of the trap daemon in FILE.

       -O [abeEfnqQsStTuUvxX]
	       Specifies  how  MIB objects and other output should be displayed.  See the section OUTPUT OPTIONS in the snmpcmd(1) manual page for
	       details.

       -t      Do not log traps to syslog.  This disables logging to syslog.  This is useful if you want the snmptrapd	application  to  only  run
	       traphandle hooks and not to log any traps to any location.

       -v, --version
	       Print version information for the trap daemon and then exit.

       -x ADDRESS
	       Connect	to  the  AgentX master agent on the specified address, rather than the default AGENTX_SOCKET.  See snmpd(8) for details of
	       the format of such addresses.

       --name="value"
	       Allows to specify any token ("name") supported in the snmptrapd.conf file and sets its value to "value". Overrides the  correspond-
	       ing token in the snmptrapd.conf file. See snmptrapd.conf(5) for the full list of tokens.

FORMAT SPECIFICATIONS

       snmptrapd interprets format strings similarly to printf(3).  It understands the following formatting sequences:

	   %%  a literal %

	   %a  the contents of the agent-addr field of the PDU (v1 TRAPs only)

	   %A  the  hostname  corresponding to the contents of the agent-addr field of the PDU, if available, otherwise the contents of the agent-
	       addr field of the PDU (v1 TRAPs only).

	   %b  PDU source address (Note: this is not necessarily an IPv4 address)

	   %B  PDU source hostname if available, otherwise PDU source address (see note above)

	   %h  current hour on the local system

	   %H  the hour field from the sysUpTime.0 varbind

	   %j  current minute on the local system

	   %J  the minute field from the sysUpTime.0 varbind

	   %k  current second on the local system

	   %K  the seconds field from the sysUpTime.0 varbind

	   %l  current day of month on the local system

	   %L  the day of month field from the sysUpTime.0 varbind

	   %m  current (numeric) month on the local system

	   %M  the numeric month field from the sysUpTime.0 varbind

	   %N  enterprise string

	   %q  trap sub-type (numeric, in decimal)

	   %P  security information from the PDU (community name for v1/v2c, user and context for v3)

	   %t  decimal number of seconds since the operating system epoch (as returned by time(2))

	   %T  the value of the sysUpTime.0 varbind in seconds

	   %v  list of variable-bindings from the notification payload.  These will be separated by a tab, or by a comma and a blank if the alter-
	       nate form is requested See also %V

	   %V  specifies  the  variable-bindings separator. This takes a sequence of characters, up to the next % (to embed a % in the string, use
	       \%)

	   %w  trap type (numeric, in decimal)

	   %W  trap description

	   %y  current year on the local system

	   %Y  the year field from the sysUpTime.0 varbind

       In addition to these values, an optional field width and precision may also be specified , just as in printf(3), and a flag value. The fol-
       lowing flags are supported:

	   -   left justify

	   0   use leading zeros

	   #   use alternate form

       The "use alternate form" flag changes the behavior of various format string sequences:

	      Time information will be displayed based on GMT (rather than the local timezone)

	      The variable-bindings will be a comma-separated list (rather than a tab-separated one)

	      The system uptime will be broken down into a human-meaningful format (rather than being a simple integer)

   Examples:
       To get a message like "14:03 TRAP3.1 from humpty.ucd.edu" you could use something like this:

	      snmptrapd -P -F "%02.2h:%02.2j TRAP%w.%q from %A
"

       If you want the same thing but in GMT rather than local time, use

	      snmptrapd -P -F "%#02.2h:%#02.2j TRAP%w.%q from %A
"

LISTENING ADDRESSES

       By default, snmptrapd listens for incoming SNMP TRAP and INFORM packets on UDP port 162 on all IPv4 interfaces.	However, it is possible to
       modify this behaviour by specifying one or more listening addresses as arguments to snmptrapd.  See  the  snmpd(8)  manual  page  for  more
       information about the format of listening addresses.

NOTIFICATION-LOG-MIB SUPPORT
       As  of net-snmp 5.0, the snmptrapd application supports the NOTIFICATION-LOG-MIB.  It does this by opening an AgentX subagent connection to
       the master snmpd agent and registering the notification log tables.  As long as the snmpd application is  started  first,  it  will  attach
       itself  to  it  and  thus  you should be able to view the last recorded notifications via the nlmLogTable and nlmLogVariableTable.  See the
       snmptrapd.conf file and the "dontRetainLogs" token for turning off this support.  See the NOTIFICATION-LOG-MIB for more details	about  the
       MIB itself.

EXTENSIBILITY AND CONFIGURATION

       See the snmptrapd.conf(5) manual page.

SEE ALSO

       snmpcmd(1), snmpd(8), printf(3), snmptrapd.conf(5), syslog(8), variables(5)

V5.6								    20 Jul 2010 						      SNMPTRAPD(8)