Arduino itself does not sell an Ethernet shield with native IPv6 support. I even asked the support for it. This is a pity.
If someone has an idea how I can use IPv6 on an Arduino (WiFi or Ethernet), please reply!
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@mark22k IPv6 is a software/network stack issue, nothing to do with hardware; i.e. works with standard shields, see: https://github.com/njh/EtherSia
@sgryphon Yes and no. IPv4 is already integrated in the hardware chip. Just as IPv6 is also integrated in some chips from WIZnet. This saves the IP stack in the code.
Thanks for the link!