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I”m using twisted framework to do some async reverse DNS resolving. I want to be able to test it against number of nameservers.
As i thought from reading the API docs when i create a Resolver object like this:
nameservers = [('4.2.2.2', 53), ('4.2.2.3', 53)]
r = client.createResolver(servers=nameservers)
It will query both nameservers, when in fact only one is used.
What are my options except using a loop?
You need to use a loop, with separate resolvers.
In DNS multiple servers are there for redundancy, and queries are only sent to multiple servers if previously tried servers fail to answer.