dnstools
DNS Diagnostics and Performance Measurement Tools
prerequisites
This script requires python3 as well as latest dnspython
dnsping
dnsping pings a DNS resolver by sending an arbitrary DNS query for given number of times:
% ./dnsping.py -c 3 -s 8.8.8.8 -t MX wikipedia.org
DNSPING 8.8.8.8: hostname=wikipedia.org rdatatype=MX
101 bytes from 8.8.8.8: seq=0 time=161.607 ms
101 bytes from 8.8.8.8: seq=1 time=156.355 ms
101 bytes from 8.8.8.8: seq=2 time=145.201 ms
--- 8.8.8.8 dnsping statistics ---
3 requests transmitted, 3 responses received, 0% lost
min=145.201 ms, avg=154.388 ms, max=161.607 ms, stddev=8.378 ms
This script calculates minimum, maximum and average response time as well as jitter
dnsperf
dnsperf is a bulk ping utility that sends an arbitrary DNS query to a give list of DNS servers. This script is meant for comparing response time of multiple DNS servers at once:
% ./dnsperf.py wikipedia.org
server avg(ms) min(ms) max(ms) stddev(ms) lost(%)
--------------------------------------------------------------------------
4.2.2.1 151.067 131.270 221.742 28.643 %10
4.2.2.2 142.175 132.921 178.133 13.348 %0
64.6.64.6 133.047 109.145 162.938 20.609 %0
64.6.65.6 377.270 97.669 661.471 172.717 %0
8.8.4.4 389.048 294.581 511.134 67.953 %0
8.8.8.8 0.000 0.000 0.000 0.000 %100
208.67.222.222 179.068 135.975 258.582 50.681 %0
208.67.220.220 137.817 135.822 140.113 1.504 %0
todo
- input sanitization
- new tool: DNS traceroute