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Pihole is DNS based Ad blocking solution. It can also be used to enhance your home network security by filtering out malicious domain and provide privacy protection by p…

What are PTR Records? PTR records (short for Pointer Records) are used to perform a Reverse DNS lookup. As you probably know, DNS (Domain Name System) is sort of a p…

Long story short, this post will guide you to create your own mail server instead of looking for mail hosting service around the whole Internet. Background Like most g…

I wrote a previous blog talking about how to issue and install letsencrypt ssl cert on Synology 3 years ago. I also participated in updating the early version of Synolog…

Since upgrade macOS to 10.15 Catalina, 32bit applications are no longer supported. It causes mac user some inconvenience to continue use legacy applications. A typical c…

I am exploring use case of Cloudflare Workers these days. One of useful function is to leverage Cloudflare workers to serve as edge cache to speed up website load time a…

The HTTP response headers that allow us to configure and deploy security features on our site. There are headers like Content Security Policy, Strict Transport Security,…

There's lot of tips and recommendations of cruise trip preparation. As a tech person, I summarized some tips focusing on IT technology based on recent cruise trip which …

There's bunch of instruction talking about how to reset password on raspbian. But they all require physical access to the raspberry pi and take out the SD card and need …

The IT technologies are changing from closed on premise infrastructure to cloud platform. Security is no longer segregated trusted zone but more zero trust approach. Wha…