We will want to use IPv6 in the product but we have a US federal
requirement (DoD UCR available online) to provide a happy eyeballs
solution where preference is given to IPv4 addresses rather than IPv6.
This will be provided via configuration in the application.

Thanks,
Alan

On 03/09/2015 12:42, "curl-library on behalf of Björn Stenberg"
<curl-library-bounces_at_cool.haxx.se on behalf of bjorn_at_haxx.se> wrote:

>Alan Cronin (alcronin) wrote:
>> The reason for making this change is that we have some customers who are
>> still using IPv4 and are trialling IPv6 but do not want any traffic
>>going
>> to those (IPv6) servers during this time. However the DNS server will
>> still return A and AAAA records.
>
>If you don't want IPv6 traffic, why is option "-4" not sufficient?
>
>What practical difference would a "--happy-prefer-ipv4" option provide
>over the "-4" option?
>
>--
>Björn
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Received on 2015-09-03