snmp server This is a topic that many people are looking for. bluevelvetrestaurant.com is a channel providing useful information about learning, life, digital marketing and online courses …. it will help you have an overview and solid multi-faceted knowledge . Today, bluevelvetrestaurant.com would like to introduce to you How SNMP Works – a quick guide. Following along are instructions in the video below:
“Everybody welcome to this snmp explainer in just a couple of minutes. I m gonna gonna teach you enough about snmp to be able to start monitoring devices while snmp a little complex there s a lot you don t need to know just to start monitoring. So we re gonna focus on the absolute basics here and i promise i won t get you lost in unnecessary details. How are we gonna do that well we re gonna talk about some basic background information.
We re gonna talk about two key terms you need to know we re gonna talk about why switches and routers are simple to monitor. We re gonna talk about how snmp works on a practical level and we re gonna talk about the different versions of snmp are you ready let s get started snmp stands for simple network management protocol. It s been around since 1988. So it s pretty well used snmp was developed to allow administrators to both monitor networking equipments.
Current state and also remotely modify settings and configurations on the equipment. While snmp was initially developed for switchers and routers. It has since been extended to a wide array of other devices. Such as windows and linux machines printers and uninterruptible power supplies.
Among many many other things there are two key terms. You need to know id and mim o..
It is short for object identifier think of it like this anything and everything on a device that can t be monitored with snmp has annoyed for example say i want to monitor the temperature on a network attached storage device. We have here nagios the oil for the temperature sensor on the device is a bunch of numbers separated by dots that number might look confusing. But all you really have to know is each thing. We can monitor like device temperature has annoyed you might think of annoyed as something similar to an ip address for a value we use an application like nagios x.
I to ask the device. What the value of any particular. I d have to be mint is short for management information base that sounds a lot more complicated than it actually is am it is a text file that allows us to translate numerical oils into bass toys so instead of using the numerical oi for the temperature sensor in our example. We can use this word based oil.
Which makes it a lot easier to understand what we re monitoring now. Technically you don t have to use mibs at all you could always use only numerical hoids. But mibs can make your life. A lot easier.
There are a number of standard lloyd s and mibs that are incorporated into most snmp implementations by default for example on almost any system out there you should be able to ask the uptime of a device with the oeid cysts uptime zero. This is great because when you go to do basic switch or router monitoring in nagios..
Xi you don t need to know a single weight or find any mips because those are already built in you really only need to figure out ways and mips. When you have a non standard to monitor like the temperature sensor on a network attached storage device like we just talked about a minute ago. How do you find out what the oeid are and where do you find mips the best place to start on both of those questions will be the product manuals from the manufacturer of the device. Many times.
These documents are available online and a simple search will get you the information you need so. Here is how snmp gets used in day to day practice. You have a network monitoring system like nagios. This is what monitors the things you want to monitor and then you have the things you want to monitor like switches and routers and servers and uninterruptible power supplies.
There are two ways to use snmp. The first way is called polling with polling. The network monitoring system connects to the monitored device on port 161 and tells the device. Which id.
It wants information on the device. Then responds with the information to the network monitoring systems..
Port 161 in the second way. We do what s called notifying with notifying. The device simply sends a message about a noid to the network monitoring systems. Port 162.
These messages are variously called either traps notifications or informs there are three versions of the snmp. Protocol version 1 version 2c and version 3 the biggest difference for our purposes is that version. 3 is more secure than versions. 1 to see in two ways first four versions one and two see you don t even have to supply a username.
All you need is a special password called the community string version three gets rid of the community string. And makes admins. Specify a username and a password second versions one and two c. Don t offer encryption.
But version. 3 does keep in mind that snmp can be used to change device settings..
So if an attacker were able to intercept and read your unencrypted v1 or v2 c. Snmp packets. The attacker could take control of the device you might find out there that snmp version 2 c. Is still pretty commonly used why wouldn t everyone always use version 3.
Well quite simply for a number of reasons. Not all devices and operating systems. Support version 3. It is best practice.
However to use version 3 whenever possible you now know enough to be dangerous you know about lloyd s and mips. You know about the two ways to use that cmp to monitor that would be polling and traps. You know switches and routers are easy to monitor and you know about snmp versions. You know enough to get out there and start monitoring with snmp thanks for watching download nagios exei from the link in the description below.
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