Tech Blog (wh)

I’m working to set up monitoring of Canon printers with SNMP, and I’m having a hard time finding resources around the internet on how to go about doing this, so this article will be collecting the resources I’ve found and putting them in once place.

Commands for Monitoring Canon Printers with SNMP

One of the problems that I had to look into was monitoring of CANON printers, and properly modifying Nagios config files for that: Once you understand a little how NAGIOS works you will understand what I am trying to show you here in example:

in /usr/local/nagios/etc/objects/commands.cfg I added a command:

define command{
          command_name check_snmp_canon
          command_line $USER1$/check_snmp -H $HOSTADDRESS$ -l STATUS -C public $ARG1$ $ARG2$
          }

then in: /usr/local/nagios/etc/objects/printer.cfg you define host and service like this:

define host{
          use          generic-printer
          host_name    SOMECANONPRINTER
          alias        SOMECANONPRINTER Alias
          address      "IP of the printer goes here"
          hostgroups   network-printers
          }

define service{
          use                   generic-service
          host_name             SOMECANONPRINTER
          service_description   Printer Status
          check_command         check_snmp_canon!-o hrDeviceStatus.1 -r "2|3"
          normal_check_interval   10
          retry_check_interval  1
          }

via http://mariuszgal.com/blog/?p=93

Some of the commands I’ve tried to execute directly from the command line use something like this:

/usr/lib/nagios/plugins/check_snmp -H 192.168.0.105 -C public -o hrDeviceStatus.1 

snmpwalk -v <snmp version, typically '2c'> -c <community string> <agent address, e.g. '192.168.3.141'> 1.3.6.1

snmpwalk -v 2c -c public 192.168.0.104

What is SNMP

Simple Network Management Protocol (SNMP) is a set of standards for managing network devices, network devices are monitored by a SNMP manager which connects to an SNMP agent on network devices. Data which the SNMP agent can access is stored in a database called Management Information Base (MIB), MIBs are sometimes called MIB trees and small pieces of information (variables) are stored on MIB leaves.

A community string is a password for accessing the SNMP agent and separate community strings are usually used for systems which require read only or read/write access.

There are 4 version of SNMP;

• SNMPv1 – Basic authentication through the use of community strings using SMIv1, the community string is sent in plain text
• SNMPv2 – Does not community strings to authenticate. Mandates the use of SMIv2 and allows the use of a new message GetBulk and Inform
• SNMPv2c – Uses SNMP version 1 style community strings sent in plain text but operates more similarly to to SNMPv2
• SNMPv3 – Similar to SNMPv2 but improvements made for security and access control.

There aren’t that many SNMP message types and its useful to know them all, the SNMP message types are;

• Get – Requests a single single variable from a MIB
• GetNext – Requests the next MIB leaf in the MIB tree
• GetBulk – Requests a sequential list of MIB leaves in a single request, GetBulk is commonly used to extract complex MIB structures
• Set – this message changes the value of a MIB variable
• Response – Sent in response to a set, get or inform type messages
• Trap – This message is sent in an unsolicited fashion and does not require confirmation
• Inform – Sent between SNMP managers to inform each other about MIB data

via http://communitystring.com/2009/06/snmp-community-strings/

monitor all HP Laserjet printers using nagios’ check_hpjd

On Thu, Jul 23, 2009 at 11:35 AM, SYS ADMIN wrote:

I have managed to monitor all my HP Laserjet printers using checkhpjd. I have several networked Canon copier/printers on my LAN, and can’t seem to get any response back from them, although snmp is installed, and I try checksnmp. Does anyone have any experience/idea what to do? I can’t seem to even find OIDs for Canons.

Make sure you are using the correct SNMP community string .. if you use an incorrect community string with an SNMP agent, you will not get an error back from the agent, just a timeout.

Did you check the vendor’s web site for MIBs? That is my first step when I am asked to monitor a device for which I have no local MIBs to look at.

Once you have a valid community string, you can do an SNMP walk on the device to see what OIDs it supports .. e.g. with the Net-SNMP CLI utilities

snmpwalk -v <snmp version, typically '2c'> -c <community string> <agent address, e.g. '192.168.3.141'> 1.3.6.1

that will walk the entire OID tree of the agent. Some agents won’t walk the enterprise OID tree with that, so you might have to do a separate walk to get the enterprise OID tree output from the agent

snmpwalk -v <snmp version, typically '2c'> -c <community string> 192.168.3.1 1.3.6.1.4.1

Other good resources to search for MIBs are the obvious one (Google) or mibdepot.com

• Max

via http://www.mail-archive.com/nagios-users@lists.sourceforge.net/msg28182.html

Keywords I used to find information about Monitoring Canon Printers with Nagios

Keywords I used when I was searching for how to do this:

• Canon iR nagios
• canon snmp nagios example
• canon snmp oid -
• check_hpjd | Nagios Plugins
• check_snmp -H 192.168.0.15 -C public -o 1.3.6.1.2.1.43.11
• community snmp agent community snmp sysad
• define command check_snmp canon
• ir 3035 oid smnp
• monitoring – How can I set up Nagios to Monitor a Canon iR 3035? -
• canon check_snmp public
• nagios canon check_snmp public
• nagios canon snmp oid
• nagios monitor canon imagerunner paper

Canon Environment Setup

This section describes how to set up the environment for communication between the machine and computers on your network. If you are configuring the settings for the first time, use the control panel of the machine.

The machine supports the SNMP v. 1 and SNMP v. 3 management functions. You can use them simultaneously. The [Read Only]/[Read/Write] functions of SNMP v. 1 and the security functions of SNMP v. 3, such as an encrypted communication path, enable you to manage devices more securely. The available combinations of SNMP v. 1 and SNMP v. 3 functions you can use are shown below:

If you want to specify a Community Name 1 Press [Community Name 1 Settings] ? [On] ? specify the settings for and the community name in [Community Name].

You can also change the community name in [Community Name] to a name other than ‘public’.

via http://www.tcnj.edu/~helpdesk/documents/Canon%20eManuals/Canon%20BW%20eManual/imageRUNNER3245Manualus/contents/nw_007/func.html

How can I set up Nagios to Monitor a Canon iR 3035?

Canon ImageRunner printers support SNMP(v1, “public” community by default) to query their status. They report through the standard printers MIB (.1.3.6.1.43, available here) as well as a proprietary Canon MIB (available through Canon, with a developer membership).

You can also implement screen-scraping from the web interface, but SNMP would be easier (and less likely to change if you change printers in the future).

via http://serverfault.com/questions/352801/how-can-i-set-up-nagios-to-monitor-a-canon-ir-3035/

Nagios Plugin Check SNMP

Usage:
check_snmp -H <ip_address> -o <oid> [-w warn_range] [-c crit_range]
[-C community] [-s string] [-r regex] [-R regexi] [-t timeout] [-e retries]
[-l label] [-u units] [-p port-number] [-d delimiter] [-D output-delimiter]
[-m miblist] [-P snmp version] [-L seclevel] [-U secname] [-a authproto]
[-A authpasswd] [-x privproto] [-X privpasswd]

Options:
 -h, --help
    Print detailed help screen
 -V, --version
    Print version information
 -H, --hostname=ADDRESS
    Host name, IP Address, or unix socket (must be an absolute path)
 -p, --port=INTEGER
    Port number (default: 161)
 -n, --next
    Use SNMP GETNEXT instead of SNMP GET
 -P, --protocol=[1|2c|3]
    SNMP protocol version
 -L, --seclevel=[noAuthNoPriv|authNoPriv|authPriv]
    SNMPv3 securityLevel
 -a, --authproto=[MD5|SHA]
    SNMPv3 auth proto
 -x, --privproto=[DES|AES]
    SNMPv3 priv proto (default DES)
 -C, --community=STRING
    Optional community string for SNMP communication (default is "public")
 -U, --secname=USERNAME
    SNMPv3 username
 -A, --authpassword=PASSWORD
    SNMPv3 authentication password
 -X, --privpasswd=PASSWORD
    SNMPv3 privacy password
 -o, --oid=OID(s)
    Object identifier(s) or SNMP variables whose value you wish to query
 -m, --miblist=STRING
    List of MIBS to be loaded (default = none if using numeric OIDs or 'ALL'
    for symbolic OIDs.)
 -d, --delimiter=STRING
    Delimiter to use when parsing returned data. Default is "="
    Any data on the right hand side of the delimiter is considered
    to be the data that should be used in the evaluation.
 -w, --warning=THRESHOLD(s)
    Warning threshold range(s)
 -c, --critical=THRESHOLD(s)
    Critical threshold range(s)
 --rate
    Enable rate calculation. See 'Rate Calculation' below
 --rate-multiplier
    Converts rate per second. For example, set to 60 to convert to per minute
 -s, --string=STRING
    Return OK state (for that OID) if STRING is an exact match
 -r, --ereg=REGEX
    Return OK state (for that OID) if extended regular expression REGEX matches
 -R, --eregi=REGEX
    Return OK state (for that OID) if case-insensitive extended REGEX matches
 --invert-search
    Invert search result (CRITICAL if found)
 -l, --label=STRING
    Prefix label for output from plugin
 -u, --units=STRING
    Units label(s) for output data (e.g., 'sec.').
 -D, --output-delimiter=STRING
    Separates output on multiple OID requests
 -t, --timeout=INTEGER
    Seconds before connection times out (default: 10)
 -e, --retries=INTEGER
    Number of retries to be used in the requests
 -v, --verbose
    Show details for command-line debugging (Nagios may truncate output)

via http://nagiosplugins.org/man/check_snmp