# The net/dnstop port

## dnstop-20110502 – pcap-based DNS query monitor

## Description

    dnstop is a libpcap application (a la 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

WWW: http://dns.measurement-factory.com/tools/dnstop/

Categories:
  net

## Library dependencies

## Build dependencies

- STEM->=1.21:textproc/groff

## Run dependencies