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RedHat 9 (Linux i386) - man page for snmp_config (redhat section 5)

SNMP.CONF(5)				     Net-SNMP				     SNMP.CONF(5)

       snmp_config - describes how to configure the Net-SNMP applications.

       The Net-SNMP package uses various configuration files to configure its applications.  This
       manual page merely describes the overall nature of them, so that the  other  manual  pages
       don't have to.

       First  off, there are numerous places that configuration files can be found and read from.
       By default, the applications look for configuration files in the following 3  directories,
       in  order: /usr/share/snmp, /usr/lib/snmp, and $HOME/.snmp.  In each of these directories,
       it looks for files with the extension of both .conf and 6 default places  a  configuration
       file can exist for any given configuration file type.

       Additionally,  the  above default search path can be overridden by setting the environment
       variable SNMPCONFPATH to a colon-separated list of directories to search for.

       Finally, applications that store persistent data will also look in the /var/snmp directory
       for configuration files there.

       Each  application  may use multiple configuration files, which will configure various dif-
       ferent aspects of the application.  For instance, the SNMP  agent  (snmpd)  knows  how  to
       understand  configuration  directives  in both the snmpd.conf and the snmp.conf files.  In
       fact, most applications understand how to read the contents of the snmp.conf files.  Note,
       however,  that  configuration  directives  understood in one file may not be understood in
       another file.  For further information, read the associated manual page with each configu-
       ration  file type.  Also, most of the applications support a -H switch on the command line
       that will list the configuration files it will look for and the	directives  in	each  one
       that it understands.

       The  snmp.conf configuration file is intended to be a application suite wide configuration
       file that supports directives that are useful for controlling the  fundamental  nature  of
       all  of	the SNMP applications, such as how they all manipulate and parse the textual SNMP
       MIB files.

       It's possible to switch in mid-file the configuration type that the parser is supposed  to
       be  reading.   Since  that sentence doesn't make much sense, lets give you an example: say
       that you wanted to turn on packet dumping output for the agent by default, but you  didn't
       want  to  do that for the rest of the applications (ie, snmpget, snmpwalk, ...).  Normally
       to enable packet dumping in the configuration file you'd need to put a line like:

	      dumpPacket true

       into the snmp.conf file.  But, this would turn it on for all  of  the  applications.   So,
       instead,  you  can put the same line in the snmpd.conf file so that it only applies to the
       snmpd daemon.  However, you need to tell the parser to expect this line.  You do  this  by
       putting	a  special type specification token inside a [] set.  In other words, inside your
       snmpd.conf file you could put the above snmp.conf directive by adding a line like so:

	      [snmp] dumpPacket true

       This tells the parser to parse the above line as  if  it  were  inside  a  snmp.conf  file
       instead of an snmpd.conf file.  If you want to parse a bunch of lines rather than just one
       then you can make the context switch apply to the remainder of the file or until the  next
       context switch directive by putting the special token on a line by itself:

	      # make this file handle snmp.conf tokens:
	      dumpPacket true
	      logTimestamp true
	      # return to our original snmpd.conf tokens:
	      rocommunity mypublic

       Any  lines  beginning  with  the character '#' in the configuration files are treated as a
       comment and are not parsed.

       Information about writing C code that makes use of this system in either the  agent's  MIB
       modules or in applications can be found in the read_config(3) manual page.


4th Berkeley Distribution		   28 Aug 2001				     SNMP.CONF(5)

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