I have a raspberry pi running dnsmasq on my lan with both IPv4 and IPv6. I would like to use the custom dns setting on the iPad to use the raspberry rather than the DNS offered by the router in DHCP and router announcement, (I don’t want everything on my lan to use the pi). I can’t use the global IPv6 address of the Pi because I do not have a static IPv6 subnet.

On my computer I am able to use the fe80 link-local address, but it does not work on the iPad. I am thinking I need to specify a zone index, but I don’t know what it would be. I tried appending %en0 but that did not work.

Is it possible to specify the zone index on iOS, and if so, what format is used?

(Using terminology from Wikipedia IPv6 article)

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