notes:on dns resolution of my homelab

revisit some [[networking]] terminologies

• [[dns]]: domain name system

  • dns: take a domain example.com and resolve into ip address 192.0.0.1

  • reverse dns: take an ip address 192.0.0.1 and then turn it to a domain example.com

  • upstream, local dns and etc/hosts: a domain usually resolved by following order:

    • /etc/hosts: the record in here is absolute, usually localhost

    • nameserver: then it send domain to nameserver to resolve domain ip

      • usually an ip address with port 53, could be your localhost:53, could be 1.1.1.1 or 8.8.8.8

    • nameserver will also check /etc/hosts and if not available then will be sent to another upstream nameserver, usually ended with your isp nameserver

    • where do we get nameserver from?: usually it automatically assign from your router alongside with your ip address through dhcp

  • dhcp: dynamic host configuration protocol

    • obligatory wikipedia page

    • tl;dr: the protocol usually run on your router to automatically assign your ip address and dns nameserver

    • without ip address your machine will not have internet to use, since there is no ip address to establish the connection wit

    • so if i turned of my dhcp service from my router, how the hell that i can manually assign ip address to my machines

      • this way harder than it sound and should not rely on external thing to manage ip address since [[openwrt]] already doing a great job at this

our dns still resolve for local domain probably due to resolution order

• since we only forward what we can’t resolve so nothing really happened