dnsdiff
About
dnsdiff compares the responses between two nameservers and provides output
in unified diff format.
Run dnsdiff before delegating authority of a zone to a new provider to
ensure that the new provider has imported your zonefile correctly.
Usage
usage: dnsdiff [-h] [-V] [-c] [-d SECONDS] [-t] -f FILENAME --from-ns
NAMESERVER1[:PORT] --to-ns NAMESERVER2[:PORT]
Options:
-h, --help show this help message and exit
-V, --version show program's version number and exit
-c, --color enable colorized output
-d SECONDS, --delay-max SECONDS
maximum number of seconds of delay to introduce
between each request
-t, --ignore-ttl ignore changes to TTL values
-f FILENAME, --zonefile FILENAME
FILENAME is expected to be a valid zonefile exported
from NAMESERVER1
https://tools.ietf.org/html/rfc1035#section-5
--from-ns NAMESERVER1[:PORT]
compare responses to NAMESERVER2
--to-ns NAMESERVER2[:PORT]
compare responses to NAMESERVER1
Example
$ dnsdiff --zonefile example.com.zone --from-ns ns1.example.com --to-ns ns1.cloudflare.com
--- ns1.example.com 2015-05-24 06:00:40 +0000
+++ ns1.cloudflare.com 2015-05-24 06:00:40 +0000
-example.com. 172800 IN NS ns1.example.com.
-example.com. 172800 IN NS ns2.example.com.
+example.com. 86400 IN NS ns1.cloudflare.com.
+example.com. 86400 IN NS ns2.cloudflare.com.
-example.com. 900 IN SOA ns1.example.com. dns.example.com. 1 7200 900 1209600 86400
+example.com. 3600 IN SOA ns1.cloudflare.com. dns.example.com. 2 3600 600 604800 1800
Docker
$ docker build -t dnsdiff .
$ docker run dnsdiff
$ docker run --rm -v example.com.zone:/zonefile.db dnsdiff --from-ns ns1.example.com --to-ns ns1.cloudflare.com --zonefile /zonefile.db
Installation (Debian)
Install system packages
sudo apt-get install python3.4 python3-pip
Setup virtualenv (optional)
sudo pip3 install virtualenv
virtualenv .venv/dnsdiff
source .venv/dnsdiff/bin/activate
Install dependencies
pip install dnspython3 blessings