[FFmpeg-devel] [PATCH v2] avformat: enable UDP IPv6 multicast interface selection using zone index

[Lynne]

Apr 29, 2024, 09:34 by remi at remlab.net:

>
>
> Le 28 avril 2024 23:11:48 GMT+03:00, Lynne <dev at lynne.ee> a écrit :
> >Apr 28, 2024, 20:15 by remi at remlab.net:
>
>>> Le torstaina 11. huhtikuuta 2024, 10.50.01 EEST Lynne a écrit :
>>>
>>>> Is there a reason why we can't switch to IPv4 addresses mapped
>>>> in IPv6 and just use the IPv6 API everywhere?
>>>>
>>>
>>> IPv6-mapped IPv4 addresses are pretty much deprecated, if supported anymore. 
>>> Some people consider them insecure. But even if you don't agree with that 
>>> assessment, the fact of the matter is that they are not portable.
>>>
> >They were they deprecated?
>
> They caused more bugs than they solved problems (because what we need is to add IPv6 to IPv4 apps, not IPv4 to IPv6 apps).
>

What bugs did they cause? I know they're not very well used, because the
documentation is very lacking, but given that it's a feature of the standard
network stack of both Linux and Windows, surely it's fuzzed and unit tested
more than enough.


>> Why would they not be portable?
>>
>
> Some OS just don't support them, or have a privileged setting to disable them globally. As a user process, you can't rely on them.
>

Which ones have a setting?
Some have a setting to disable IPv6 globally which must be fairly more used,
but I haven't heard ones which have that setting in.