Table of Contents
Domain Name System (DNS) Configuration, Management and Troubleshooting
DNS Roadmap
DNS Reference book
DNS Introduction and Overview
The situation...
In the beginning...
Domain Name System
DNS is a distributed database
Advantages of DNS
What DNS Doesnít Do
Fully-Qualified Domain Names (FQDN)
DNS Structure
Nameservers
Tasks of DNS Client (Resolver)
Tasks of the DNS server...
If partial answer is known...
Check our cache for answer
ěReverseî lookups
Types of DNS Nameservers
Types of Nameservers
Root Nameservers
Zone
Delegation
Sample Zone file
Really ugly sample in zone file
Delegation lists all authoritative servers for a domain
Authoritative Answer
Primary Nameserver
Primary Nameserver
Secondary Nameserver
Zone Transfer
Secondary Asks for SOA
Secondary Performs Zone Transfer
Secondary Nameserver Configuration file
Secondary Nameserver SOA Magic Numbers
Caching-only Nameserver
Caching-only Nameserver
Forwarder
Slave
Configuration file CACHE line
Configuration file PRIMARY 127/8 line
DNS Resource Records
Resource Records
Multiple Resource Records
A Record
PTR Record
MX Record
CNAME Record
NS Record lists nameservers for the zone
Common Mistake #1: Parent and Child donít agree
Common Mistake #1: Part 2 of 2
Common Mistake #2: NS Records != Servers
Common Mistake #2 (part 2 of 2)
SOA Record
Example SOA Record
SOA Record Fields
More SOA Record Fields
Records you donít care about very much
DNS Hints
Location of Nameservers
DNS Technology: A litmus test for your ISP
Vulnerabilities
Short Cuts
Record Short Cuts
Short Cuts
Pseudo-root Nameserver
Registering Domains and Nameservers
DNS Troubleshooting
DNS Troubleshooting Using NSLOOKUP
Using NSLOOKUP
Query types
Answers
Debugging
Common Problems
Problem Symptoms
DNS Configuration, Management and Troubleshooting
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