Is there an option in GrapheneOS to disable/set IPv6?

jackFang

If not, can this be implemented? This or the option to be able to set custom IPv6 DNS.

Reason: pi-hole ad blocking or your own DNS server

I know in out of the box Android they only let you configure IPv4 but not IPv6.

I am aware you can specify Private DNS. But that only allows you to specify "private DNS provider hostname" example: one.one.one.one (cloudflare, if not mistaken), but you cannot specify self hosted addresses on local network

You should be able to achieve above with 3rd party apps already, so what is stopping GOS to implement this?

bookreader

jackFang but you cannot specify self hosted addresses on local network

Wouldn't it be the job of your local network to handle DNS for connected devices? Your local network (/router) will hand out the DNS server address over DHCP and is also in a position to catch and redirect all outbound DNS traffic.

And personally, I wouldn't bother with pihole. Use a router that can run openwrt and install one of the various adblockers onto it.