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NAME    [Toc]    [Back]

     snmpd -- simple and extendable SNMP daemon

SYNOPSIS    [Toc]    [Back]

     snmpd [-dh] [-c file] [-D options] [-I paths] [-l prefix]
	   [-m variable[=value]] [-p file]

DESCRIPTION    [Toc]    [Back]

     The snmpd daemon servers the internet SNMP (Simple Network Managment Protocol).
  It is intended to server only the absolute basic MIBs and implement
 all other MIBs through loadable modules. In this way the snmpd can
     be used in unexpected ways.

     The options are as follows:

     -d 	 This option is used for debugging snmpd and causes it not to
		 daemonize itself.

     -h 	 This option prints a short usage message.

     -c file	 Use file as configuration file instead of the standard one.

     -D options  Debugging options are specified with a -o flag followed by a
		 comma separated string of options.  The following options are

		 dump	      This option causes all sent and received PDUs to
			      be dumped to the terminal.

		 events       This causes the debugging level of the event
			      library (see eventlib(3)) to be set to 10.

		 trace=level  This option causes the snmp library trace flag
			      to be set to the specified value. The value can
			      be specified in the usual C-syntax for numbers.

     -I paths	 This option specifies a colon separated list of directories
		 to search for configuration include files. The default is
		 /etc:/usr/etc/:/usr/local/etc.  These paths are only searched
		 for include specified within <> parantheses.

     -l prefix	 The prefix is used as the default basename for the pid and
		 the configuration files.

     -m variable[=value]
		 Define a configuration variable.

     -p file	 Specify an alternate pid file instead of the default one.

CONFIGURATION    [Toc]    [Back]

     The snmpd reads its configuration from either the default or the user
     specified configuration file. The configuration file consists of the following
 types of lines:

	   +o   variable assignments

	   +o   section separators

	   +o   include directives

	   +o   MIB variable assignments

     If a line is too long it can be continued on the next line by ending it
     with a backslash. Empty lines and lines who's first non-blank character
     is a ``#'' sign are ignored.

     All MIB variable assignments of the entire configuration (including
     nested configuration files) are handled as one transaction, i.e. as if
     they arrived in a single SET PDU. Any failure during the initial configuration
 read causes snmpd to exit. A failure during the configuration read
     caused by a module load causes the loading of the module to fail.

     The configuration is red during initialisation of snmpd, when a module is
     loaded and when snmpd receives a SIGHUP.

   VARIABLE ASSIGNMENTS    [Toc]    [Back]
     Variable assignments can take one of two forms:

	   variable := string
	   variable ?= string

     The string reaches from the first non-blank character after the equal
     sign until the first new line or ``#'' character. In the first case the
     string is assigned to the variable unconditionally, in the second case
     the variable is only assigned if it does not exist yet.

     Variable names must begin with a letter or underscore and contain only
     letters, digits or underscores.

   SECTION SEPARATORS    [Toc]    [Back]
     The configuration consists of named sections. The MIB variable assignments
 in the section named ``snmpd'' are executed only during initial
     setup or when snmpd receives a SIGHUP. All other sections are executed
     when either a module with the same name as the section is loaded or snmpd
     receives a SIGHUP and that module is already loaded. The default section
     at the start of the configuration is ``snmpd''.  One can switch to
     another section with the syntax


     Where secname is the name of the section. The same secname can be used in
     more than one place in the configuration. All of these parts are collected
 into one section.

   INCLUDE DIRECTIVES    [Toc]    [Back]
     Another configuration file can be included into the current one with the
     include directive that takes one of two forms:

	   .include "file"
	   .include <"file">

     The first form causes the file to be searched in the current directory,
     the second form causes the file to be searched in the directories specified
 in the system include path. Nesting depths is only restricted by
     available memory.

     A MIB variable is assigned with the syntax

	   oid [ suboids ] = value

     oid is the name of the variable to be set. Only the last component of the
     entire name is used here. If the variable is a scalar, the index (.0) is
     automatically appended and need not to be specified. If the variable is a
     table column, the index ( suboids) must be specified. The index consist
     of elements each seperated from the previous one by a dot. Elements may
     be either numbers, strings or hostnames enclosed in [] brackets. If the
     element is a number it is appended to the current oid. If the element is
     a string, its length and the ASCII code of each of its characters are
     appended to the current oid. If the element is a hostname, the IP address
     of the host is looked up and the four elements of the IP address are
     appended to the oid.

     For example a oid of


     results in the oid


     The value of the assignment may be either empty, a string or a number.
     If a string starts with a letter or an underscore and consists only of
     letters, digits, underscores and minus signs, it can be written without
     quotes. In all other cases the string must be enclosed in double quotes.

SUBSTITUTIONS    [Toc]    [Back]

     A variable substitution is written as


     where variable is the name of the variable to substitute. Using an undefined
 variable is considered an error.

FILES    [Toc]    [Back]

     /etc/<prefix>.config   Default configuration file, where the default
			    <prefix> is ``snmpd''.
     /var/run/<prefix>.pid  Default pid file.
			    This is the default search path for system include
			    The definitions for the MIBs implemented in the

SEE ALSO    [Toc]    [Back]


STANDARDS    [Toc]    [Back]

     The snmpd conforms to the applicable IETF RFCs.

AUTHORS    [Toc]    [Back]

     Hartmut Brandt <brandt@fokus.gmd.de>

BUGS    [Toc]    [Back]


FreeBSD 5.2.1			August 15, 2002 		 FreeBSD 5.2.1
[ Back ]
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