[ga] DNS Root-Level Pollution

[Danny Younger <dannyyounger@xxxxxxxxx>]

http://www.caida.org/research/dns/roottraffic/comparison06_07.xml

Interesting CAIDA study, especially regarding some of the conclusions cited 
below:

"The proportion of invalid traffic, i.e., DNS pollution, hitting the roots is 
still high, over 99% of the queries should not even be sent to the root 
servers. We found an extremely strong correlation both years: the higher the 
query rate of a client, the lower the fraction of valid queries. 
Repeated, identical and "referral-not-cached" queries constituted 69% of the 
total load on the roots during the 2007 observations. We are not in a position 
to evaluate the cost of this pollution to the root operators or to the 
Internet, nor the cost of cleaning it up. Some sources of this pollution could 
be mitigated by DNS operators locally serving common zones. For the March 2008 
DITL experiment we will further investigate the patterns of these invalid 
queries and identify other ways to reduce the DNS pollution at the roots."