From the course: Analyzing VoIP Traffic with Wireshark
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Domain Name System - Wireshark Tutorial
From the course: Analyzing VoIP Traffic with Wireshark
Domain Name System
- [Instructor] Every device that's connected to the internet, such as a web or email server, a VoIP phone, or other end device, has an IP address. Domain name system, or DNS, maps a host name to an IP address and works like the internet's phone book. This enables devices to connect with one another. Whenever you place a call to a SIP address, the server will request the address from the DNS server. Once it's resolved, you can make the call. With DNS, there are a number of different types of resource records. These resource records are used to specify a resource type and an IP address to locate the resource. Some commonly seen records are a type A record. A type A resource record is used for an IP version four address. You might also see a quad A, which is used for an IP version six address. A mail exchange record will redirect mail to a mail server. And the last entry is a service record, which defines available services such as HTTP, LDAP, and SIP. Similar to the way a mail exchange…
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