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DNS Performance and the Effectiveness of Caching Jaeyeon Jung, Emil Sit, Hari Balakrishnan, Member, IEEE, and Robert Morris
 

Summary: 1
DNS Performance and the Effectiveness of Caching
Jaeyeon Jung, Emil Sit, Hari Balakrishnan, Member, IEEE, and Robert Morris
Abstract--This paper presents a detailed analysis of traces of DNS and
associated TCP traffic collected on the Internet links of the MIT Laboratory
for Computer Science and the Korea Advanced Institute of Science and
Technology (KAIST). The first part of the analysis details how clients at
these institutions interact with the wide-area domain name system, focusing
on performance and the prevalence of failures and errors. The second part
evaluates the effectiveness of DNS caching.
In the most recent MIT trace, 23% of lookups receive no answer; these
lookups account for more than half of all traced DNS packets since query
packets are retransmitted overly persistently. About 13% of all lookups re-
sult in an answer that indicates an error condition. Many of these errors ap-
pear to be caused by missing inverse (IP-to-name) mappings or NS records
that point to non-existent or inappropriate hosts. 27% of the queries sent
to the root name servers result in such errors.
The paper also presents the results of trace-driven simulations that ex-
plore the effect of varying TTLs and varying degrees of cache sharing on
DNS cache hit rates. Due to the heavy-tailed nature of name accesses, re-

  

Source: Akella, Aditya - Department of Computer Sciences, University of Wisconsin at Madison

 

Collections: Computer Technologies and Information Sciences