OK altering the interface from the PiHole seems to have fixed that particular PiHole, but doesn't explain the issues with the DNS name resolution on the router/Optiplex.
For some reason the Optiplex PiHole handles a lot less traffic than the other one now, which is stated as the second PiHole...
Ah... weird issue I've found...:
Even though I have disabled the wifi network on the Win 11 PC (Optiplex), it appears that the PiHole is using with wifi0 interface instead of eth0.
This still strikes me as odd being that the router is still showing the correct ethernet connection, so I'm not...
^^^ DNS filter settings - Optiplex PiHole isn't working - looks to be the DNS issue illustrated above. Totoro (Nas) PiHole working fine.
^^^ Internet / WAN settings - requires ethernet Dual WAN to use local internet (via NTD box) - Australian NBN network - Telstra - see below:
^^^ Dual WAN...
OK sorry but I'm a bit green to this. I've got a DSL-68U (with Gnuton) and AC-68U hooked up fine. Mesh-config, wired together.
My internet works via a second ethernet WAN - and I suspect this maybe causing my issue? (Good old Australian NBN over HFC doesn't require the 'modem').
Essentially I...