DNS

• dig
• nslookup

Links

• http://stackoverflow.com/questions/4645950/dns-forwarding-using-cname
• https://www.mnxsolutions.com/devops/a-proper-server-naming-scheme.html
• http://web.archive.org/web/20091003023412/http://tothink.com/mnemonic/wordlist.txt
• https://github.com/singpolyma/mnemonicode/blob/master/mn_wordlist.c
• https://wiki.hetzner.de/index.php/DNS_Zonendatei

Check DNS Problems on Ubuntu

/etc/resolv.d
nmcli device show wlp59s0 | grep IP4.DNS
systemd-resolve --flush-caches

Systemd

systemctl status systemd-resolved
resolvectl status