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DNS and Telephony
DNS Training Description:

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.

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.

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 exercises.

DNS Training 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.

DNS Training Course duration:

1 day

DNS Training Course 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

Please contact your training representative for more details on having this course delivered onsite or online

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