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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 available.

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

                          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

     -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 <>

     -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

     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
     configuration 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
     assignments 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
     collected 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
     specified 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
     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.

     A variable substitution is written as


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

     /etc/<prefix>.config                         Default configuration file,
                                                  where the default <prefix>
                                                  is ``snmpd''.
     /var/run/<prefix>.pid                        Default pid file.
     /etc:/usr/etc/:/usr/local/etc                This is the default search
                                                  path for system include
     /usr/share/snmp/mibs/BEGEMOT-SNMPD.txt       The definitions for the MIBs
                                                  implemented in the daemon.
     /etc/hosts.allow, /etc/hosts.deny            Access controls that should
                                                  be enforced by TCP wrappers
                                                  should be defined here.
                                                  Further details are
                                                  described in

     gensnmptree(1), hosts_access(5)

     The bsnmpd conforms to the applicable IETF RFCs.

     Hartmut Brandt <>


FreeBSD 11.0-PRERELEASE        February 27, 2006       FreeBSD 11.0-PRERELEASE


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