DNS
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DNS Concepts
I always compare DNS to a phone book, you know the person or company you want to call, but don't know their number. DNS is more convenient for sure: you ask the internet for what you want (most likely along the lines of a domain name), and it looks up the number for you, using DNS.
To keep DNS fast and reliable, distributed redundancy is a key component. Most domain names have their "names and numbers" stored at various locations. The problem with this is keeping all the data in sync. Luckily DNS has some solutions for that, too.
The serial number confirms records are the same, and AXFR to synchronize zone files.
DNS Record Types
DNS Software
- BIND
- NSD
- Unbound
- MyDNS software is good stuff. We use it to manage many a domain name, along with YoDNSConf!
- powerdns
- MaraDNS
- Djbdns
- Dnsmasq
- Eagle DNS
Other Uses
- DNSRBL - Realtime block lists
- Sender Policy Framework