Getting Let’s Encrypt Certificate using DNS-01 challenge with acme-dns-certbot-joohoi or acme.sh

Getting Let’s Encrypt Certificate using DNS-01 challenge with acme-dns-certbot-joohoi or acme.sh, in manual or automated way, using a cron job and/or DNS APIs, if available Read More …

Nginx – How to disable access (http and https) to a website using IP address [New Question]

A quick question, answered on Heelpbook, about how to “Disable access (http and https) to a website using IP address”, on Linux platforms using Nginx web/reverse proxy server . This will help forcing access to web sites and applications using only FQDNs. Read More …

What are Data URLs?

A Data URL is a URI scheme that provides a way to inline data in a document, and it’s commonly used to embed images in HTML and CSS. Data URLs are a form of Uniform Resource Locators, although they do not in fact remotely locate anything. Instead, the resource data is contained within the URL string itself as a base64-encoded string. This saves the browser from having to make additional HTTP requests for the external resources, and can thus increase page loading speed. Read More …

Direct Broadcast Address (DBA)

With directed broadcast, all recipients are always addressed within the target network. A combination of the number of the target network and the setting of all host bits to 1 produces the broadcast address in this case. If the destination is not located in its own (sub-) network, a router forwards the data packet. Read More …

Ubuntu – What is netplan?

Since Ubuntu 18.04 LTS has switched to Netplan for configuring network interfaces. Netplan is based on YAML based configuration system that makes configuration process very simple. Using netplan gives a central location to describe simple to complex networking configurations that function from Desktop to Server and from Cloud to IoT environments. Read More …