Networking Task: DNS and Hostname Resolution

Goal

Resolve and troubleshoot DNS names and hostnames in LAN or external networks.

Local Checks

hostname
hostnamectl
cat /etc/hostname

DNS Checks

dig example.com
nslookup example.com
getent hosts example.com

Internal DNS (Pi-hole or Unbound)

• Validate local DNS record:

  dig internal.service.local @192.168.1.2
  

• Check /etc/resolv.conf

Preventive Actions

• Set static hostnames and map in Pi-hole
• Avoid DNS leaks or misrouting

Tools

• dig, nslookup, getent, hostnamectl