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Complete Guide to Netflow: How Netflow & its Components Work. Netflow Monitoring Tools

Posted in Netflow

This article will cover the basics of Netflow, including its use cases, Netflow supported devices, Netflow history, and variants. We’ll also dive into the technical details of how the Netflow protocol works, including the Netflow ports, and the various Netflow versions. This will lead onto coverage of the various Netflow components, including the Netflow Exporter, Netflow Collector, and Netflow Analyzer, with some brief coverage of its main competition. Here’s the full breakdown of what’s covered:

Related articles:

Introduction to Netflow – What is Netflow Used for?

Visibility plays a key role in the maintenance and security of any network. With it, admins can identify issues, discover non-compliant users, refine their provisioning, and more. Netflow is a protocol developed by CISCO that fulfils this purpose, letting interested parties understand network patterns and protocol distribution, while supporting more granular data like IP service type for diagnosis.

Its relatively low overhead and trusted history means that Netflow is still around in some forms a decade after its release. As well as user and application monitoring, admins utilize Netflow for network planning, application reporting and profiling, security analysis, and usage-based reporting and billing.

cisco netflow router cache

Broadly, a flow is a group of packets part of the same conversation between two endpoints in a network. More technically, a single flow is defined by its 5-tuple, a collection of five data points that include:

  • Source and destination IPs addresses
  • Source and destination ports
  • The protocol

As you’d expect, the Cisco-developed protocol is supported by a number of CISCO networking devices. The company’s IOS-XR routers use a software implementation running on line card CPU, while the IOS line runs software on route processor. Meanwhile, Catalyst and Nexus switches have a dedicated hardware TCAM implementation, generally supporting more flows.

Netflow History, RFC, Netflow Vendor Variants

Free Webinar - Dealing with Remote VPN Challenges, Performance, Security & Monitoring

Posted in OpManager - Network Monitoring & Management

With a lot of enterprises switching to a work-from-home model, it is critical for admins to have a strategy in place to avoid poor performance and ensure secure access. This webinar will help you understand how you can effectively manage the security and performance of various components of your IT infrastructure even while working remotely.

Click here to register for this Free Webinar

manage engine webinar - the new normal remote workforce

Topics covered:

  • Why its critical to keep tabs on the availability and performance of servers and networks in your data center.
  • Effective ways to address and resolve real-time VPN monitoring challenges.
  • How to analyze and correlate network statistics to manage your networks better.
  • Threat factors IT admin need to be aware in order to ensure smooth transition to the new routine.
  • The need for application performance monitoring at the end-user level.

How to Enable or Disable SSH on VMware ESXi via Web GUI, vSphere Web GUI (vCenter), vSphere Client and Shell Console

Posted in Virtualization & VM Backup

SSH access to VMware’s ESXi server is by disabled by default however there are many reasons where SSH might be required. VMware and System administrators often find the need to perform advanced administrative tasks that require SSH access to the ESXi host. For example, deleting or reloading a VM with an Invalid Status can only be performed via SSH.

In this article, we’ll show you how to enable SSH on your ESXi host with just a few simple steps. This task can be achieved via the ESXi Web GUI, vSphere Web GUI (vCenter) vSphere client or ESXi console. We’ll cover all three methods.

Execution Time: 5 minutes

Security Tip: If your ESXi host management IP is not protected or isolated from the rest of the network, it is advisable to enable SSH on an as-needed basis.

Enabling and Disabling SSH Console on VMware ESXi via Web GUI

Log into your ESXi server and select the host from the Navigator window. Next, go to Action > Services and select the Enable Secure Shell (SSH) menu option:

vmware esxi enable ssh

This will immediately enable SSH. To disable SSH, repeat the same steps. You’ll notice that the Disable Secure Shell (SSH) option is now available:

vmware esxi disable ssh

Enabling and Disabling SSH on VMware via vSphere Web GUI Client (vCenter)

For those with a VMware vCenter environment, you can enable SSH for each ESXi host by selecting the host and then going to Manage > Settings > Security Profile > Edit.  In the pop-up window, scroll down to SSH Server and tick it. Optionally enter the IP address or network(s) you require to have SSH access to the host:

vmware esxi enable ssh vsphere web gui

Enabling and Disabling SSH on VMware ESXi via vSphere Client

How to Install and Configure SNMP for Windows Server 2016

Posted in Windows Server 2016

Simple Network Management Protocol (SNMP) is a UDP protocol that uses port 161 to monitor and collect detailed information on any network device supporting the SNMP protocol. All Windows servers support SNMP and we’ll show you how to easily install and configure SNMP on your Windows 2016 or 2012 server, including Read Only (RO) or Read Write (RW) SNMP community string.

In our example we will enable the SNMP agent and configure a SNMP community string to allow our Network Monitoring System (NMS) monitor our server resources.

Execution Time: 10 minutes

Step 1 – Install SNMP on Windows Server 2016

Open the Control Panel on your Windows Server and Double-click on the Program and Features icon:

windows server turn features on off

 

This will open the Add Roles and Features Wizard. Keep clicking on the Next button until you reach the Features section. From there, select the SNMP Service option:

windows server snmp service installation

 

When prompted, click on the Add Features button to include the installation of the Administration SNMP Tools:

windows server additional snmp tools

Optionally you can include the SNMP WMI Provider option located under the SNMP Service. When ready click on the Next button.

Simple Guide on Installing & Configuring a Windows 2016 Certification Authority Server

Posted in Windows Server 2016

windows ca serverA Windows Active Directory Certification Authority server (AD CA), also known as a Certificate Authority, is an essential service to every organization’s Active Directory as it can manage, issue, revoke and renew digital certificates used to verify the identity of users, computers and other network services.

This guide will show you how to quickly install and setup a Certification Authority server on Windows 2016 server. The guide includes the installation of the Certification Authority Web Enrollment service to allow your organization to request, renew and download certificates via a simple web interface.

Execution Time: 10 - 15 minutes

Step 1 – Installation of Windows Active Directory Certificate Services

Launch Server Manager and go to Manage > Add Roles and Features:

windows ca server installation server manager

 

At the next screen select simply click on the Next button:

windows ca server installation add roles features

 

Ensure Role-based or feature-based installation is selected and click on Next:

windows ca server installation select destination server

 

At the next screen select the destination server from the available Server Pool and click on the Next button:

windows ca server installation select server

 

Next, tick the Active Directory Certificate Services from the available roles:

CCENT/CCNA

Cisco Routers

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