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DNS Messages


If you want to write programs that can utilize DNS messages then you must understand the format.  So where will you find all the queries and responses that DNS uses to resolve addresses?  Well the majority are mostly contained within UDP, each message will be fully contained within a UDP datagram.  They can also be…

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DNS Zone Transfers


Zone transfers are an important part of distributing changes between name servers.  Every domain on the internet (and within private networks for that matter) much have a master server which contains the definitive records of names and addresses for that domain.  Zone transfers are the system which allows any changes on the master server be…

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The Basics of the Domain Name System


So what is the Domain Name System or as it’s more commonly known as DNS? Well, very simply it is a huge distributed database which contains the domain names and addresses of all devices on the network.  This structure is crucial to the way DNS functions, it allows local control of specific segments – and…

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