Abstract-The Domain Name System (DNS) domain names to be used in network transactions (email, web requests, etc.) instead of IP addresses. The root of the DNS distributed database is managed by 13 root nameservers. We passively measure the performance of one of them: F.root-servers.net. These measurements show an astounding number of bogus queries: from 60-85% of observed queries were repeated from the same host within the measurement interval. Over 14% of a root server's query load is due to queries that violate the DNS specification. Denial of service attacks using root servers are common and occurred throughout our measurement period (7-24 Jan 2001). Though not targeted at the root servers, DOS attacks often use root servers as reflectors toward a victim network. We contrast our observations with those found in an earlier study of DNS root server performance by Danzig et. al. [1] .
In particular, Brownlee et al. discovered that 60%-85% of queries to the F-root server are repeated REF .
DNS measurements at a root server
GLOBECOM'01. IEEE Global Telecommunications Conference (Cat. No.01CH37270)
GLOBECOM'01. IEEE Global Telecommunications Conference (Cat. No.01CH37270)
Computer Science