[Development] Windows: Trying to join to a multicast group as a receiver with specific interface always uses default interface

Konstantin Tokarev annulen at yandex.ru
Fri Jan 27 10:36:59 CET 2017

27.01.2017, 12:11, "Konrad Rosenbaum" <konrad at silmor.de>:
> Hi Thiago,
> On Fri, January 27, 2017 04:49, Thiago Macieira wrote:
>>  If it is IPv4, the priority for your issue has just dropped to the floor.
>>  I
>>  won't debug IPv4 multicast on Windows, on principle.
>>  I will review IPv4 patches, but I will not lift a finger to test them.
> I'm not sure whether this argument is persuasive for you: industry will
> stay on IPv4 private networks (192.168.*, 10.*, 172.16.*, etc.) for a LONG
> time. The networks are working, the infrastructure is known to every admin
> out there, and lots of software has problems with IPv6 if it supports it
> at all!

I think here Thiago just stated his personal priorities/interests, not official
position of Qt Project.

Still, multicast on Linux has much more industrial uses than on Windows.

> In fact quite a few of my colleagues will not recognize 2001:db8::42 as a
> valid IP address...
> In short: IPv4 (including multicast, which is used for "message buses")
> has to work well for the foreseeable future. Even on an OS that we both
> would not recommend for production use... ;-)
>    Konrad
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