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DNS Protocol Analysis

Capturing & Analyzing ...

Capturing & Analyzing DNS Traffic

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Revision #1

Created 3 years ago by David Cassidy

Updated 3 years ago by David Cassidy

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Domain Name Format

The DNS Tree

Root Servers

TLD Servers

Authoritative Nameservers

Local Name Resolutions

DNS Resolvers

Iterative Name Resolution

Recursive Name Resolution

Caching

DNS Name Resolution Workflow

Reverse Name Resolution

Registration Hierarchy

Registration Process

Choose a Registrar

Choosing a TLD

Choosing a Second-Level Domain

WHOIS

Domain Contacts

Domain Privacy

EPP Status Codes

SOA Records

NS Records

A & AAAA Records

CNAME Records

TXT Records

MX Records

SRV Records

PTR Records

Architecture

Client

Cache-Only DNS Server

Authoritative DNS Server

High Availability

NSLOOKUP

HOST

DIG

WHOIS

DNS Messages

RCODES

DNS Header

Capturing & Analyzing DNS Traffic

Constructing DNS Packets

Methodology

Configuration Issues

Latency Issues

Considerations

Configuration Errors to Avoid

Tracking Down Bad Domains

Securing DNS: RPZs

DNS Fingerprinting

Common DNS Attacks

DNS Cache Poisoning Attacks

DNS Cache Poisoning Attacks with Subdomains

NXDomain Attack

DNS Query Flood Attack (DDoS)

DNS Amplification

Phantom Domain Attacks

BIND DNS Security

DNSSEC

Capturing & Analyzing DNS Traffic