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Posts published in “Network”

Deploy Zabbix Agent into CentOS and Add into Zabbix Server


Zabbix Agent is required to install on all remote systems needs to be monitor through Zabbix server. The Zabbix Agent collects resource utilization data and applications data on the client system and provides such information to the Zabbix server on their requests.

There are two types of checks between Zabbix Server and Client.

  • Passive Check – Zabbix Agent sent data to server on their request.
  • Active Check – Zabbix Agent sends data periodically to server.

Adding Windows Host into Zabbix (Active Check Mode)


1. Download Zabbix Agent Make sure you are using same version as your Zabbix server. I am using Zabbix 4.0 LTS, so here is my download link for Windows Agent: 2. Install Zabbix Agent By default, it will install your agent as passive mode 2.1 Verify ports For passive mode: C:\Users\John>netstat -na | find “100”   TCP              LISTENING  …

Quickly Deploy Zabbix in CentOS7

Zabbix is a mature and effortless enterprise-class open source monitoring solution for network monitoring and application monitoring of millions of metrics. This post is going to install zabbix4.0 into a brand new Centos7.x system environment, including default installation of mariab5.5, php5.4, apache2.4 as well. 

All configurations are almost default, the ultimate goal is to  install the zabbix system in a fastest way.

Understanding Ping Command


The ping command operates by sending Internet Control Message Protocol (ICMP) Echo Request
messages to the destination computer and waiting for a response. How many of those responses are returned, and how long it takes for them to return, are the two major pieces of information that the ping command provides.

ping /?

Gartner Magic Quadrant for the Wired and Wireless LAN Access Infrastructure (2018, 2017, 2016, 2015, 2014, 2013, 2012, 2011, 2010)


Gartner’s Magic Quadrant for Wireless LAN Infrastructure has been released for a couple of years. This post listed all reports found from Internet since 2010. If you are not familiar with this research publication or Gartner, please see graphic below. Gartner places vendors in one of four quadrants – Leaders, Visionaries, Niche Players and Challengers based on their score system.


Gartner has named Cisco, Aruba (HPE), and Extreme Networks as the leader in the Magic Quadrant for Wireless LAN Infrastructure on July 2018.

Gartner Magic Quadrant for Cloud Infrastructure as a Service (Worldwide) (2018,2017,2016,2015,2014,2013,2012…)

In the context of this Magic Quadrant, cloud compute IaaS (hereafter referred to simply as "cloud IaaS" or "IaaS") is defined as a standardized, highly automated offering, where compute resources, complemented by storage and networking capabilities, are owned by a service provider and offered to the customer on demand. The resources are scalable and elastic in near real time, and metered by use. Self-service interfaces are exposed directly to the customer, including a web-based UI and an API. The resources may be single-tenant or multitenant, and hosted by the service provider or on-premises in the customer's data center. Thus, this Magic Quadrant covers both public and private cloud IaaS offerings.

Gartner's two top leaders, AWS and Microsoft, didn't change for all the time from 2010 to 2018. But Google Cloud Platform has made to leader quadrant this year.

Free DNS Server and (from CloudFlare) – Fastest and Easiest to Remember


Google free DNS server and has been used by me for many years, since it is decent fast and also easy to remember. But now Cloudflare just announced their DNS server and on April 1st 2018.

Here is their comparison diagram with other free public DNS server providers.

Not only fastest, Cloudflare pledged that it will not write your ip to the disk and not keep your tracking data long, it will purge all logs within 24 hours. How cool is this privacy focus feature? Definitely, I will give it more try later if there is any need to use a public DNS server.