DNS and Telephony Training

Duration: 1 day.

La formation est aussi disponible en français.

Other courses: Basic DNS, DNS Security, Advanced DNS, DNS and IPv6, DNS on Windows Servers, LDAP Courses, Telecommunications/SS7 courses.

The primary focus of the course is BIND which is available on Linux, UNIX and Windows platforms. The course is offered with Linux (Fedora Core), FreeBSD or Windows 2003 as the platform for all excercises.

Summary

Reliable and robust operation of the DNS hierarchy - from the root servers to an individual domain name server - is critical to all Internet operations and particularly when used to support telephony. The course covers the configuration and operation of DNS systems used to support VoIP and Telephony applications - specifically uses in Mobile systems, SIP, H.323 and ENUM are covered. While the primary focus of the course is BIND other DNS software (NSD and Windows) will be discussed.

Description

Students will review the theory behind the DNS hierarchy, the DNS protocol, forward and reverse mapping zone files. The major Zone file Resource Records (SOA, NS, MX, CNAME, A, AAAA, PTR, TXT, SRV and NAPTR) are described and explained in detail with reference to their uses in SIP, H.323 and ENUM applications. The course includes a number of hands on configuration exercises.

Audience:

The course is designed for DNS administrators, Network and System Administrators, VoIP administrators and those who need a thorough understanding of the the DNS when used to support telephony applications. Students with a particular interest in IPv6 mobile applications should attend the DNS and IPv6 course. Students should ideally have attended the Basic DNS course or have two years of DNS operational experience.

About the Instructor

Ron Aitchison is the author of Pro DNS and BIND (Apress ISBN 1-59059-494-0) which was the first book to cover the new DNS security protocols (DNSSEC). Ron has been involved in communications and networking for more years than he cares to admit and is president and founder of Zytrax, Inc. a company specializing in IP communications (wired and wireless), systems development and consulting in Montreal, Canada. He has been involved with Open Source software and systems for over 10 years.

Outline

Outline

Module 1: DNS Refresher

• The DNS hierarchy (name servers and resolvers)
• Authoritative and cached responses
• Delegation - Parent and child domains
• Forward and Reverse mapping
• Zone files - best practice
• DDNS, AXFR, IXFR, NOTIFY
• DNS types
• Diagnostic Tools - DIG, NSLOOKUP
• DNS software - options and overview

Module 2: DNS Security Basics

• Security overview
• Security threat analysis
• DNS security scope (Zone transfer, DDNS, Zone integrity)
• Stealth configurations
• Administrative security (jails, permissions, server configurations)
• BIND Logs
• BIND's server clause
• Cache Poisoning 101
• RNDC - advanced configuration
• Mail Anti-SPAM (SPF, DKIM)
• Software diversity

Module 3: Mobile Telephony

• The mobile environment
• Mobile and IPv6 (3GPP)
• Status and plans
• DNS (and DHCP) implications

Module 4: VoIP and DNS

• SIP Protocol Overview
• H.323 Protocol Overview
• DNS requirements

Module 5: DNS Configurations

• H.323 DNS configurations
• SIP DNS configurations (SRV RR)
• Exercise

Module 6: ENUM

• ENUM Overview
• ENUM configuration - Reverse Mapping
• NAPTR RR
• ENUM NAPTR RR examples
• Exercise

Module 7: Summary

• Review
• Resources

Other courses: Basic DNS, DNS Security, Advanced DNS, DNS and IPv6.