作者: Kazuya Takemori , , Dennis Romana , Shinichiro Kubota , Kenichi Sugitani
DOI: 10.22266/IJIES2009.1231.05
关键词:
摘要: We carried out an entropy study on the DNS query traffic from Internet to top domain server in a university campus network through January 1st March 31st, 2009. The obtained results are: (1) observed difference for changes among total-, A-, and PTR resource records (RRs) based 17th February 1st, (2) found large NS RR including only keyword "." total inbound traffic. (3) also that unique source IP address slightly increased, while keywords one drastically decreased 9th, specific host which was already-hijacked classical Linux PC SSH dictionary attack sites From these results,we can detect unusual outbound attacks by watching Internet.