Origin of DNS setting(s)?

Installing and Using OpenWrt
1

My home network has a PiHole and for the most part it seems to do its job though it occasionally leaks. While investigating a recent leakiness I noticed on the EA8300 router’s Status Overview page under the section titled Network and then IPv4 Upstream (has blue background and located about 1/3 down the page) that the DNS settings do not point to the PiHole. Instead, they point to the ISP. I could not locate any setting in Luci that would affect changing those. The PiHole does not point to either of those DNS servers. The router’s DNS setting under Interfaces → lan → Advanced → Use custom DNS servers points to the PiHole IP. Additionally, under the DHCP Server tab → Advanced Settings → DHCP-Options also is set to advertise the PiHole via option 6.

Is something broken?

Protocol: DHCP client
Address: re:da:ct:ed/##
Gateway: re:da:ct:ed
DNS: 75.75.75.75
DNS: 75.75.76.76

2

As a fellow Xfinity customer, the wan interface must have the “Use DNS servers advertised by peer” enabled on the Advanced tab of the interface details.

3

OK, I think that’s a default setting and one I had not touched. It IS enabled/checked.

4

Why is this? Is Xfinity now blocking the use of non-Xfinity DNS servers (seems unlikely)?

5

Sorry, I meant that his setting is probably enabled, not that it is required to be enabled. Ambiguous word choice on my part.

Mine is off and pointing to 1.1.1.2.

6

TY @Dave14305 for clarifying how to employ that setting. Toggling it to OFF/Cleared and then inserting the PiHole IP into the resultant field reset the IPv4 Upstream DNS setting to that of the PiHole’s IP. Well, it did so after the changes were Saved and Applied.