On Thu, 6 Dec 2018, Badari Prasad via curl-library wrote:

> Require info on CURLOPT_INTERFACE, does libcurl choose appropriate ip
> address (ipv4 or ipv6) from an eth interface depending on destination?

I believe it does. See
https://github.com/curl/curl/blob/master/lib/if2ip.c#L117 and onwards.

But the IPv6 binding is also buggy in some senses, and we have this old
KNOWN_BUG recorded for it:

   https://curl.haxx.se/docs/knownbugs.html#interface_for_ipv6_binds_to_un

-- 
  / daniel.haxx.se
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