snmpwalk  -  retrieve a subtree of management values using SNMP GETNEXT




   snmpwalk is an SNMP application that  uses  SNMP  GETNEXT  requests  to
   query a network entity for a tree of information.

   An  object identifier (OID) may be given on the command line.  This OID
   specifies which portion of the object identifier space will be searched
   using  GETNEXT  requests.  All variables in the subtree below the given
   OID are queried and their values presented to the user.  Each  variable
   name is given in the format specified in variables(5).

   If  no OID argument is present, snmpwalk will search the subtree rooted
   at SNMPv2-SMI::mib-2 (including any MIB object values  from  other  MIB
   modules,  that  are  defined  as  lying  within  this subtree).  If the
   network entity has an error processing the  request  packet,  an  error
   packet  will  be  returned  and  a  message  will  be shown, helping to
   pinpoint why the request was malformed.

   If the tree search causes attempts to search beyond the end of the MIB,
   the message "End of MIB" will be displayed.


   -Cc     Do  not  check  whether the returned OIDs are increasing.  Some
           agents (LaserJets are an example) return OIDs out of order, but
           can  complete  the  walk anyway.  Other agents return OIDs that
           are out of order and can cause snmpwalk to  loop  indefinitely.
           By  default,  snmpwalk  tries to detect this behavior and warns
           you when it hits an agent acting illegally.  Use  -Cc  to  turn
           off this check.

   -CE {OID}
           End  the  walk  at  the  specified  OID,  rather  than a simple
           subtree.  This can be used to walk a partial subtree,  selected
           columns  of a table, or even two or more tables within a single

   -Ci     Include the given OID in the search range.   Normally  snmpwalk
           uses  GETNEXT  requests starting with the OID you specified and
           returns all results in the MIB  subtree  rooted  at  that  OID.
           Sometimes,  you  may  wish  to include the OID specified on the
           command line in the printed results if it is a valid OID in the
           tree itself.  This option lets you do this explicitly.

   -CI     In  fact,  the given OID will be retrieved automatically if the
           main subtree walk returns no useable  values.   This  allows  a
           walk  of a single instance to behave as generally expected, and
           return the specified instance value.   This  option  turns  off
           this  final  GET  request,  so a walk of a single instance will
           return nothing.

   -Cp     Upon completion of the walk,  print  the  number  of  variables

   -Ct     Upon completion of the walk, print the total wall-clock time it
           took to collect the data (in seconds).  Note that the timer  is
           started  just  before  the beginning of the data request series
           and stopped just after it  finishes.   Most  importantly,  this
           means  that  it  does  not include snmp library initialization,
           shutdown, argument processing, and any other overhead.

   In addition  to  these  options,  snmpwalk  takes  the  common  options
   described in the snmpcmd(1) manual page.


   Note  that snmpwalk REQUIRES  an argument specifying the agent to query
   and at most one OID argument, as described there.  The command:

   snmpwalk -Os -c public -v 1 zeus system

   will retrieve all of the variables under system:

   sysDescr.0 = STRING: "SunOS 4.1.3_U1 1 sun4m"
   sysObjectID.0 = OID: enterprises.hp.nm.hpsystem.10.1.1
   sysUpTime.0 = Timeticks: (155274552) 17 days, 23:19:05
   sysContact.0 = STRING: ""
   sysName.0 = STRING: ""
   sysLocation.0 = STRING: ""
   sysServices.0 = INTEGER: 72
   (plus the contents of the sysORTable).

   The command:

   snmpwalk -Os -c public -v 1 -CE sysORTable zeus system

   will retrieve the scalar values, but omit the sysORTable.


   snmpcmd(1), snmpbulkwalk(1), variables(5).


Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.

Free Software

Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.

Free Books

The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.