matching the source ip and port

pm8pm8 at pm8pm8 at
Fri Aug 19 21:03:22 UTC 2016

Dear All,
When receiving a response to a DNS query, does Unbound match the source ip 
of the response to the destination ip of the query and discard the response 
if they do not match? Does it match the ports?
I.e. apart from checking
query.transactionID == response.transactionID
does Unbound check for
query.destinationIP == response.sourceIP
query.destinationPort == response.sourcePort?
Can you point me to the function in the source code where this check does 
or does not happen?
Any help is appreciated.

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