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What is SNMP?

Aamir khan (Cyber Security Analyst)
Apr 10, 2018
3 min read

Simple Network Management Protocol (SNMP) is a protocol for network management. It is used for collecting information from, and configuring, network devices, such as servers, printers, hubs, switches, and routers on an Internet Protocol (IP) network.

It usually run on UDP port 161.

Download Link: https://downloads.vyos.io/?dir=release/1.1.8

Create New Virtual Machine using the VMware and change the Network Adapter to Bridged as shown in the given screenshot.

After completing the initial setup in the VMware Boot the Newly created Virtual Machine by clicking on the Power on the Virtual Machine.

The Default Login Credentials for Vyos are

Username: vyos

Password: vyos

This is a Live Boot of the vyos, so we will install the vyos to use it properly.

We will use the iso image to install vyos.

Type the following command:

Enter “Yes” where it asks to continue.

Next it will ask about the partition management.

Enter “Auto” where it asks about Partition.

It will detect the drives in the Virtual System and ask you to select the particular drive in which you want to install vyos.

Enter “sda” where it asks about the location for installation.

Next it will ask about the size for the root partition for the vyos.

You can enter any size from 1000MB to 21474MB. But it is recommended to keep it maximum i.e. 21474MB.

Next it will ask about the name for the image.

By default the name is set to the version number that is 1.1.8. You can either give a personalized name or you can leave it default.

Next it will ask about the location to copy the sda.

It is recommended to keep it default.

After that it will ask for the password to be kept for the administrator account.

By default it is kept vyos. But from security point of view it is recommended to change it to something complex which is difficult to guess or brute force.

Now it will ask for the drive on which you want to setup GRUB Boot-loader? Again leave it default to “sda”.

After that we have completed the vyos setup. Reboot using the command

Command: reboot

After reboot it will ask for login credentials, Enter the credential that you entered during the installation.

Now we will configure the Network Interface. To do that, we will have to enter configuration mode.

Command: configure

After entering into configuration mode set up Network interface

Syntax: set interface ethernet [network interface] address [Static IPv4 Address]

Command: set interface Ethernet eth0 address 192.168.1.125/24

Now Commit and Save the Configuration

Command: commit

Command: save

After that type “exit” to get out of configuration mode and then reboot the machine using “reboot” command

We are rebooting because the configuration changes come in effect only after a reboot.

You can the view interface which we configured by using the command

Command: show interfaces

Note: Above command will run in configuration mode.

Start SNMP service

Now we will set up the snmp service in the Vyos.

For that we will enter configuration mode using command

Command: configure

Now to set up a snmp service we will need to add a community string and give it an authorization. To do that:

Syntax: set service snmp community [community-string] authorization [auth-mode]

[community-string]: It can be anything but normally it is either public or private. But from a security point of view it is recommended to keep it that cannot be easily guessed or bruteforced.

[auth-mode]: It is the Authorization Mode. We have two options

[ro]: Read Only Authorization (It can only be used to read or extract data, we can change it using this string)
[rw]: Read Write Authorization (It can be used to change the data using the string)

Command: set service snmp community ignite123 authorization ro

Command: set service snmp community ignite123 authorization rw