SNMP Hands - On

Through this hands-on you will Install and learn to use the SNMP commands, Explore and identify standard vs enterprise parts of the MIB tree and Install vendor specific MIBs and use those with the SNMP commands

Setting up the Virtualbox

Installation of virtualbox and Downloading virtual hard disks

• Download and install virtualbox 5.0.x​
• Download the Virtual Hard disks from the LEARN mirror. You can get them by following links
  • ​Netmon.vdi
• Note down the location of downloaded vdi files

Creating the VM Netmon

• Start VirtualBox and Click on New button (at top-right) to create new virtual machine
• Enter name of the VM as Netmon
• Select OS Type: Linux
• Select Version: Ubuntu (64-bit)
• Then click on Continue button
• Set VM's memory size to 2048MB and click on Continue button
• Set VM's hard disk option to Use an existing virtual hard disk file and click the browse button and browse to the location where you download the virtual hard disks. Then select the Netmon.vdi file and click on the create button.
• You will see a new virtual machine named Netmon appears on Virtual Box Manager Window

Setting up Network Interfaces

• Select the Netmon VM from left panel on Virtual box, right click and open Settings
• Click on the Network title
• On Adapter 1 check the Enable Network Adapter . Then change Attached to be to the Bridged Adapter and make sure the name of the interface is the same interface which you use to connect to the outside (Either Wi-Fi or Ethernet). This virtual interface will work as the WAN port of the of your virtual campus network that can be used to connect from out side.
• Click on Advanced drop down list and change the promiscuous mode to Allow All
• Click OK

Netmon VM

Before running Dynagen you have to start your VMs and assign IP address to the VM's network interfaces.

• Select the Netmon VM from left panel on Virtual box, right click Start and wait till the VM starts
• login to the machine using the following user credentials

  usrname  : learn
  password : <classpassword>
  

• Then change the interfaces file. Root password is the same as class password

  sudo vi /etc/network/interfaces
  

• locate the following lines

  iface enp0s3 inet static
   address 192.168.56.2
   netmask 255.255.255.0
   network 192.168.56.0
   broadcast 192.168.56.255
   gateway 192.168.56.1
   dns-nameservers 192.248.1.161
  

• Change it to the following lines. You can find your IP Address from this table

  iface enp0s3 inet static
   address <Your IP Address >
   netmask 255.255.255.0
   network 192.248.6.0
   broadcast 192.248.6.255
   gateway 192.248.6.254
   dns-nameservers 192.248.1.161
  

• Save and Exit the editor (type :wq)
• When you completed the IP settings , reboot the machine

  sudo reboot
  

• Confirm the correct IP settings by ifconfig command. Your result should be something like the following. Check the IP address of enp0s3 Interface and see whether the other interfaces are up

  enp0s3    Link encap:Ethernet  HWaddr 08:00:27:8c:e0:26
            inet addr:<your IP address>  Bcast:192.248.6.255  Mask:255.255.255.0
            inet6 addr: fe80::a00:27ff:fe8c:e026/64 Scope:Link
            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
            RX packets:1120 errors:0 dropped:0 overruns:0 frame:0
            TX packets:7550 errors:0 dropped:0 overruns:0 carrier:0
            collisions:0 txqueuelen:1000
            RX bytes:99387 (99.3 KB)  TX bytes:567441 (567.4 KB)
  
  
  lo        Link encap:Local Loopback
            inet addr:127.0.0.1  Mask:255.0.0.0
            inet6 addr: ::1/128 Scope:Host
            UP LOOPBACK RUNNING  MTU:65536  Metric:1
            RX packets:160 errors:0 dropped:0 overruns:0 frame:0
            TX packets:160 errors:0 dropped:0 overruns:0 carrier:0
            collisions:0 txqueuelen:1
            RX bytes:11840 (11.8 KB)  TX bytes:11840 (11.8 KB)
  

• Try ping to some known hosts and see the results.

  ping 192.248.6.254
  ping 192.248.1.161
  ping www.google.com
  

Remote Access

Windows

• Download ​Putty
• type your vm's IP address in the hostname text box. set the port as 22
• Click open and You will ask the username and Password of your vm. Provide them and You will be able to remote login to your linux machine

Mac/Linux

• Open a terminal
• Type ssh <your username>@<Your VM's IP address>
• Give password and you will have a remote login to your linux machine