Description:
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When using multiple curl_exec calls but using different CURLOPT_IPRESOLVE settings, the first setting takes effect regardless of what you set in the next calls.

Test script:
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Precondition: two hosts with IPv4 AND IPv6. 
Place the script returning your remote address on one server and the test-script on the other. Execute the test-script.

Code:
http://pastebin.com/M1tfCtuq

The test-script eliminates cache-issues on both servers by using random additions to the URL fetched

Expected result:
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CURLOPT_IPRESOLVE should take effect on each call, especially in combination with CURLOPT_FRESH_CONNECT

Actual result:
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there is always the connection-type used which was used for the first connect