BIND Logging – some basic recommendations
https://kb.isc.org/docs/aa-01526
Microsoft to add DANE and DNSSEC support to Exchange Online servers
https://www.zdnet.com/article/microsoft-to-add-dane-and-dnssec-support-to-exchange-online-servers/
Maltronics Site
Maltronics Documentation
Turning off or disabling SELinux
https://www.revsys.com/writings/quicktips/turn-off-selinux.html
A tcpdump Tutorial with Examples — 50 Ways to Isolate Traffic
https://danielmiessler.com/study/tcpdump/
Hacking Tricks
IBM’s Quad 9 Video
How To Run Multiple PHP Versions on One Server Using Apache and PHP-FPM on CentOS 7
Try Hack Me
https://tryhackme.com/room/welcome
DNS-SEC Debugger
https://dnssec-debugger.verisignlabs.com/ibm.com
DNS SEC
DNSSEC, SPF, DKIM and DMARC explained
How to Check PHP Version
https://www.thegeekdiary.com/how-to-check-the-php-version-on-linux/