At home I have installed Pi-Hole on a Fedora 28 machine, and it is now working properly serving IPv4 addresses via DHCP, acting as the DNS server, and blocking IPv4 addresses as appropriate. However, it seems to be failing to block IPv6 addresses. In the log I see (for example):
2018-06-12 00:11:15 IPv4 v10.events.data.microsoft.com 192.168.1.79 Pi-holed - Whitelist 2018-06-12 00:11:15 IPv6 v10.events.data.microsoft.com 192.168.1.79 OK (forwarded) - Blacklist
...There are a good many other such combinations: IPv4 Pi-holed, IPv6 forwarded at the same timestamp to the same FQDN.
I know very little about IPv6 at this moment. These are a few of the gaps in my knowledge that I think are contributing to my issue:
- How do I handle distributing IPv6 addresses in my home LAN? On Pi-Hole's DHCP page, there's a setting to "Enable IPv6 Support", which I've done. Does this mean my Pi-Hole will now serve up IPv6 addresses?
- On my router, I have various IPv6 settings: IPv6 (I turned it on), DHCPv6 (also on, but makes no difference if it's off it seems), DHCPv6 Prefix Delegation (on, and unmodifyable when DHCPv6 is off). This may be colliding with PiHole, but,
- I don't know if I can shut off IPv6 or even DHCPv6 on my router, because from what I've read, the concept of having NAT'ed IPv6 addresses inside the LAN is passe'. All devices get a routable IPv6 address these days because of the large address space.
- I cannot modify the Upstream DNS servers on my PiHole settings page to include, for example, Google's IPv6 servers. I don't know why.
IPv6 testing sites show that I can reach them via IPv6.
Ultimately, I'm concerned about two things: I can't change the IPv6 DNS settings, and the logs show that IPv6 entries are forwarded.