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DNSTOP: STAY ON TOP OF YOUR DNS TRAFFIC

dnstop is a libpcap application (ala tcpdump) that displays various tables of DNS traffic on your network. Currently dnstop displays tables of:

  • Source IP addresses
  • Destination IP addresses
  • Query types
  • Response codes
  • Opcodes
  • Top level domains
  • Second level domains
  • Third level domains
  • etc...

dnstop supports both IPv4 and IPv6 addresses.

To help find especially undesirable DNS queries, dnstop provides a number of filters. The filters tell dnstop to display only the following types of queries:

  • For unknown/invalid TLDs
  • A queries where the query name is already an IP address
  • PTR queries for RFC1918 address space
  • Responses with code REFUSED
dnstop can either read packets from the live capture device, or from a tcpdump savefile.

© 2013 The Measurement Factory.