[](https://travis-ci.org/farrokhi/dnsdiag) [](https://pypi.python.org/pypi/dnsdiag/) []() []() [](https://github.com/farrokhi/dnsdiag/stargazers) DNS Diagnostics and Performance Measurement Tools ================================================== Ever been wondering if your ISP is [hijacking your DNS traffic](https://decentralize.today/is-your-isp-hijacking-your-dns-traffic-f3eb7ccb0ee7#.fevks5wyc)? Ever observed any misbehavior with your DNS responses? Ever been redirected to wrong address and suspected something is wrong with your DNS? Here we have a [set of tools](http://github.com/farrokhi/dnsdiag) to perform basic audits on your DNS requests and responses to make sure your DNS is working as you expect. You can measure the response time of any given DNS server for arbitrary requests using `dnsping`. Just like traditional ping utility, it gives you similar functionality for DNS requests. You can also trace the path your DNS request takes to destination to make sure it is not being redirected or hijacked. This can be done by comparing different DNS queries being sent to the same DNS server using `dnstraceroute` and observe if there is any difference between the path. `dnseval` evaluates multiple DNS resolvers and helps you choose the best DNS server for your network. While it is highly recommended to use your own DNS resolver and never trust any third-party DNS server, but in case you need to choose the best DNS forwarder for your network, `dnseval` lets you compare different DNS servers from performance (latency) and reliability (loss) point of view. # prerequisites This script requires python3 as well as latest [dnspython](http://www.dnspython.org/) and [cymruwhois](https://pythonhosted.org/cymruwhois/). Please note that "dnstraceroute" requires a modified version of dnspython module. All required third-party modules are included as GIT submodules. You just need to run `git submodule update --init` and project directory to pull the required code. # installation There are several ways that you can use this toolset. However using the sourcecode is always recommended. ## From Source Code 1. You can checkout this git repo and its submodules ``` git clone https://github.com/farrokhi/dnsdiag.git cd dnsdiag git submodule update --init ``` 2. You can alternatively install the package using pip: ``` pip3 install --process-dependency-links dnsdiag ``` ## From Binary From time to time, binary version will be released for Windows, Mac OS X and Linux platforms. You can grab the latest release from [releases page](https://github.com/farrokhi/dnsdiag/releases). # 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.py DNS: 8.8.8.8:53, hostname: wikipedia.org, rdatatype: MX 101 bytes from 8.8.8.8: seq=0 time=262.896 ms 101 bytes from 8.8.8.8: seq=1 time=305.608 ms 101 bytes from 8.8.8.8: seq=2 time=307.221 ms --- 8.8.8.8 dnsping statistics --- 3 requests transmitted, 3 responses received, 0% lost min=262.896 ms, avg=291.908 ms, max=307.221 ms, stddev=25.138 ms ``` This script calculates minimum, maximum and average response time as well as jitter (stddev) # dnstraceroute dnstraceroute is a traceroute utility to figure out the path that your DNS request is passing through to get to its destination. You may want to compare it to your actual network traceroute and make sure your DNS traffic is not routed to any unwanted path. ``` % ./dnstraceroute.py --expert -s 8.8.4.4 yahoo.com dnstraceroute.py DNS: 8.8.4.4:53, hostname: yahoo.com, rdatatype: A 1 204.109.58.53 (204.109.58.53) 1 ms 2 208.79.80.5 (208.79.80.5) 1 ms 3 162.223.13.177 (162.223.13.177) 1 ms 4 208.79.80.254 (208.79.80.254) 7 ms 5 eqixva-google-gige.google.com (206.126.236.21) 7 ms 6 209.85.242.142 (209.85.242.142) 7 ms 7 72.14.236.148 (72.14.236.148) 8 ms 8 209.85.250.70 (209.85.250.70) 16 ms 9 74.125.37.222 (74.125.37.222) 16 ms 10 * 11 google-public-dns-b.google.com (8.8.4.4) 15 ms === Expert Hints === [*] public DNS server is next to an invisible hop (probably a firewall) ``` Using `--expert` will instruct dnstraceroute to print expert hints (such as warnings of possible DNS traffic hijacking). # dnseval dnseval 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: ``` % ./dnseval.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 ``` ### Author Babak Farrokhi - twitter: [@farrokhi](https://twitter.com/farrokhi) - github: [/farrokhi](https://github.com/farrokhi/) - website: [farrokhi.net](https://farrokhi.net/) ### License dnsdiag is released under a 2 clause BSD license. ### Credits - [@rthalley](https://github.com/rthalley) for invaluable [dnspython](https://github.com/rthalley/dnspython) library - [@JustinAzoff](https://github.com/JustinAzoff) for [python-cymruwhois](https://github.com/JustinAzoff/python-cymruwhois) library - [@bortzmeyer](https://github.com/bortzmeyer) for his feedback and patches