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Understanding and evaluating the Behaviour of DNS resolvers
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The Domain Name System is a core service of the Internet, as every computer relies on it
to translate names into IP addresses, which are then utilised to communicate with each
other. In order to translate the names into IP addresses, computers resort to a special
server, called a resolver. A resolver is a special DNS server that knows the DNS structure
and is able to navigate the huge number of DNS servers in order to find the final answer
to a query. It is important for a resolver to be able to deliver the final answer as quickly
as possible, to have the smallest impact on user experienced latency.
Since there is a very large amount of domains and servers, and the system is highly
replicated, there has to be some logic as to how a resolver selects which server to query.
This brings us to the problem we will study in this thesis: how do resolvers select
which DNS server to contact? If a resolver always selects the best DNS server - the one
that will be able to provide the answer to the query the fastest - then resolvers can more
quickly answer their clients, and thus speed up the Internet. However, if they contact
different, more or less equivalent, servers they could contribute to load balancing.
To understand how exactly the resolvers select the DNS servers to contact, we conducted
an experimental study, where we analysed different resolvers and evaluated how
they select the servers. We base the structure and parameters of our study in previous
research that has been conducted on the topic, which shows that resolvers tend to use the
latency of its queries to the servers as a means of selecting which server to contact.
Descrição
Palavras-chave
Domain Name System Resolver Server Selection