On Thu, 27 Aug 2015, Alan Cronin (alcronin) wrote:
Howdy! Sorry for responding so slowly.
The change involves adding an option to Curl (something like
CURLOPT_IP_FAMILY_PREFERENCE) which would allow a preference of IPv4 vs IPv6
to be set for the first connection in a dual stack environment. This
functionality would extend the happy eyeballs algorithm.
There is already an CURLOPT_IPRESOLVE option which limits the IP version but
this new option is more a preference in the case there is both an IPv4 and
IPv6 interface for the connection.
We propose making a change to connect.c::Curl_connecthost() and reorder the
conn->tempaddr object before calling singleipconnect() based on the option
set by the consumer.
What are your thoughts on this proposal?
I'm not opposed adding an option like this, but still, can you tell us
something about the motivation/need for this so that we understand it better?
Happy Eyeballs is after all explicitly designed to slightly favor IPv6.
--
/ daniel.haxx.se
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