16 Aug 21
Article covers the three major components of modern email domain security: DKIM for signing, SPF for sender verification, and DMARC for stricter enforcement of the other two. It is assumed the reader has a basic understanding of DNS and has experience using email with their own domain.
02 Aug 21
17 Jul 21
18 Jun 21
An illustrated guide to of how DNS over HTTPS works.
High-level introduction to DNS in the form of a comic.
14 Jun 21
28 Feb 21
04 Jan 21
How to setup DNS records to ensure that domains that do not send email cannot be used for spoofing.
09 Dec 20
Smart devices manufacturers often “hard-code” in a public DNS server, like Google’s 8.8.8.8, and their devices ignore whatever DNS server is assigned by the router. Fortunately, with a few simple firewall rules, you can intercept these hardcoded DNS queries and redirect them to your DNS resolver. These instructions are for pfSense, but can be adapted to other firewall/routers.
16 Nov 20
28 Sep 20
Good explanation of DNS for normies
18 Jun 20
18 Apr 20
14 Apr 20
02 Apr 20
11 Mar 20
23 Jan 20
19 Dec 19
04 Nov 19
Example script to use the livedns API from Gandi to dynamically update subdomains with dynamic IPs.