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BSNMPD(1)               FreeBSD General Commands Manual              BSNMPD(1)

     bsnmpd -- simple and extensible SNMP daemon

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

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

     The options are as follows:

     -d          This option is used for debugging bsnmpd 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 <> parentheses.

     -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.

     The bsnmpd 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 in which the 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 config-
     uration read causes bsnmpd to exit.  A failure during the configuration
     read caused by a module load causes the loading of the module to fail.

     The configuration is read during initialization of bsnmpd, when a module
     is loaded and when bsnmpd receives a SIGHUP.

     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.

     The configuration consists of named sections.  The MIB variable assign-
     ments in the section named ``snmpd'' are executed only during initial
     setup or when bsnmpd receives a SIGHUP.  All other sections are executed
     when either a module with the same name as the section is loaded or
     bsnmpd 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 col-
     lected into one section.

     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 speci-
     fied in the system include path.  Nesting depth 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 separated 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 host-
     name, 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.

     A variable substitution is written as


     where variable is the name of the variable to substitute.  Using an unde-
     fined variable is considered an error.

     /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
     /etc/hosts.allow, /etc/hosts.deny
                            Access controls that should be enforced by TCP
                            wrappers should be defined here.  Further details
                            are described in hosts_access(5).

     gensnmptree(1), hosts_access(5)

     The bsnmpd conforms to the applicable IETF RFCs.

     Hartmut Brandt <>


FreeBSD 6.2                    February 27, 2006                   FreeBSD 6.2


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