Do all MIB browsers have a provision to add SNMP masks? Specifically, does the ManageEngine MIB Browser Free Tool allow for adding SNMP masks?
If you were referring to the family mask, part of SNMP VACM, then you should check the specification of the MIB Browser you are using.
As long as the product claims to fully support RFC 3415, then it should support family mask feature.
But this really depends on the vendors.
Related
SNMP is generally used to monitor the health of components in network.
For SDN [Software Defined network], is it desirable to use SNMP . I am having doubt like is it better to use some other protocol like NETCONFIG
In general SNMP can be used for configuration of a device, however personally I will not stretch it too far specifically when network configuration operation potentially spans across multiple devices and as a result will have higher order transaction requirements.
RFC3512 provides good perspective around configuration using SNMP. Reading through the RFC it will become apparent that within a device transaction relies on how well the MIBs (the objects used via SNMP for performing configuration changes) are designed and implemented. For configuration spanning across multiple devices the device transaction alone will not suffice, if rolling back the configuration is a requirement (this depending on the nature of service/use-case being addressed by your SDN controller). I would recommend reading the Transaction Control in MIB Objects further to understand the requirements on the protocol and eventually the capabilities of the MIB modules that one will be using for configuration.
Netconf was created with configuration of devices in mind and it offers various capabilities that are of use in this regard. These are covered in detail in the IETF standard for Netconf Protocol RFC under Capabilities section. The capabilities such as Candidate Configuration, Validate Configuration, Confirmed Commit, Rollback on Error and other such are specified in the standard which shall further aid in orchestration of a transaction across multiple device.
I am new to SNMP.
I am having a doubt in snmp view configuration in router.
What all the mibs will be included by default for polling in snmp v3 ?
If I include a mib in snmp view ? Only that included mib will be available for polling? All the other mibs will not be able to poll ?
The SNMP VACM subsystem of SNMPv3 is designed to restrict access to certain MIB tree branches. So yes your assumptions are correct.
I want to monitor 3 kinds of data for windows machines:
cpu temperature,
fan temperature
and fan speed, retrieving these data every 5 minutes. If these data can be retrieved by SNMP, that's my first choice.
I am wondering whether these data's root data source comes from Microsoft or the vendor of the motherboard. If they come from Microsoft, their OID should starts with 1.3.6.1.4.1.311, if they come from motherboard vendor, their OID should starts with 1.3.6.1.4.1.[motherboard vendor private snmp vendor OID], for example 1.3.6.1.4.1.11 for a HP server machine, 11 represents HP's private snmp vendor OID.
If you simply want to know how to query a Windows machine for the relevant SNMP data, this is possibly not the right site to ask this question on as it is a site for Q&A specific to software development. You may have better success asking at Server-Fault - here is a similar question to yours on there.
The OIDs for hardware specific SNMP monitoring are usually vendor specific. Typically you would need the Management Information Base (MIB) files that apply to your specific hardware in order to extract the information about which OIDs pertain to the data you require - as far as I know, CPU and Fan temperature are not generic SNMP properties.
If you cannot find the MIBs for your hardware sets (or there is no SNMP agent for your specific hardware), there is a piece of Windows software called SpeedFan that has an SNMP plugin that allows you to monitor the CPU and fan temperatures via SNMP. However this would require the Speedfan software to run in the background on all machines you wish to monitor. The OIDs for the SpeedFan software SNMP plugin are:
Temperature: .1.3.6.1.4.1.30503.1.5.x
Fans: .1.3.6.1.4.1.30503.1.6.x
Voltages: .1.3.6.1.4.1.30503.1.7.x
To get started monitoring this SNMP data on a Windows client machine you typically would need to:
install SNMP agent service
configure the SNMP service
Install speedfan
Install the Speedfan SNMP plugin
determine which OIDs are pertinent to your hardware (either using SpeedFan or vendor specific MIBs)
use an SNMP tool to perform an SNMP walk or an SNMP get to fetch the relevant SNMP data.
Using the command-line tool netsnmp you can walk the SNMP tree like so:
snmpwalk -v 2c -c public 127.0.0.1 .1.3.6.1.4.1.30503.1.5
(Assuming that your community string is "public" and you want to walk the "SpeedFan termperatures" sub-tree of your machine in this example).
A handy client tool with a gui for viewing snmp data is mibbrowser
The linked to Server-Fault Q&A has other useful information and links to various SNMP monitoring software solutions such as nagios, opennms etc.
I have some linux servers which will work as SNMP agents. I need to use Java and SNMP4J to monitor these servers (agents), and also the SNMP manager must be able to check upon these servers.
How to implement SNMP in the SNMP agent to respond to the queries from SNMP manager?
What is the usage of MIB file? If I hardcode the values in the MIB file, does it mean that I don't need to parse the MIB file?
String product = "1.2.3.1.2.3.6421"
String productmgr = "1.2.3.1.2.3.6421.4"
There are some SO questions that should help.
For #1 look at Getting started with SNMP4J
For #2 you can indeed hardcode OIDs; but that would only work for a trivial scenario, there are many questions regarding MIBs e.g. question about SNMP MIB file
In order to implement SNMP agent on client side, after installing snmp , just execute snmp commands to communicate with the manager.
The Management Information Base (MIB) is a virtual information storage area for network management information, which consists of collections of managed objects. Within the MIB there are collections of related objects, defined in MIB modules. MIB modules are written in the SNMP MIB module language, as defined in STD 58, RFC 2578, RFC 2579, and RFC 2580.
Of course you can hardcode some OIDs in SNMP MIB. But in most of the cases it will not be stable. Even if you hardcode the values in the MIB file, then again you need to reparse the same.
What is the Major difference in SNMP over DTLS and SNMPv3 USM model, which one to prefer.
TLS and DTLS make use of the Transport Security Model (TSM) security model, defined in RFC5591 which was created as an alternative to the USM security model
The difference is what is the problem each of them wants to resolve.
SNMP v3 USM enhances the SNMP message format itself to add proper integrity check and encryption, so that it can be transferred on probably unsafe wires.
SNMP over DTLS uses another approach that it tries to build safe channels on unsafe wires, and allows the messages to be transferred safely.
You can prefer either of them to achieve significant security improvements over the original SNMP, but please analyze your scenarios carefully and put the following into consideration,
What are the devices in your whole solution?
Whether they support both models? Which one of them only supports one of the model?
Then you can make a decision on which model to choose. As far as I know SNMP v3 USM is more widely supported, but I might be wrong.