Hello Harold, Thanks for responding!
I am pretty "dumb" when it comes to some of the terminology being used so I will do my best here to confirm and clarify your questions and statements starting from the first post.
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upstream internet connection terminated by a Verizon Fios modem. The WAN connection on that router is assigned a variable internet routeable address, usually stable.
If by "Upstream" you mean the terminus until the point where internet leaves the house, yes the last device following the line would be the Fios Modem. As for the router (Fios supplied) it is connected to the modem and works without issue. Further, my router, the TP, is connected to the Fios router and functioned seemingly normal. So it's Coax / Fiber > Fios Modem > Fios Router > TP Link Router > PiHole. IF YOU ARE SPEAKING OF THE FIOS ROUTER, I WILL CHECK SOON. -
That router offers a LAN network, ip range 192.168.1.0/24 If you mean the TP Link router, the LAN page under Network shows "IP Address 192.168.0.1". I'd have to check the Fios router at a later time.
IF YOU ARE SPEAKING OF THE FIOS ROUTER, I WILL CHECK SOON.
That router is configured with a DHCP server offering addresses from the 192.168.1.0 range. If you mean the TP Link router, Under "DHCP" the "Start IP Address" is 192.168.0.100, and the "End IP Address" is 192.168.0.199 Both "Primary DNS" and "Secondary DNS" fields are empty. All options on this page are grayed out.
This network provides “stable” undisturbed network access for your colleagues. Connections to the internet from this network are NAT translated to the upstream IP. The TP Link and Fios provided Routers both provide stable internet access simultaneously. I believe I am using OpenDNS on the PIHiole, not sure about the routers. Sadly unsure what a NAT is in this case, even after looking it up.
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Ethernet connected to this network you have a TP-Link TL-WR940N router. Yes, connected to the Fios provided router "stealing internet from it".
That router is configured with a DHCP client on its WAN link, that has acquired 192.168.1.165 from the “upstream” DHCP server. Yes, the WAN under Network has 192.168.1.165 as IP address. It also has Primary and Secondary DNS set as 192.168.1.1 and 192.168.1.100. -
That TP-Link router is also configured with a DHCP server offering the IP range 192.168.0.0/24, to your “unstable” clients. That router is also NAT translating client connections to the internet to 192.168.1.165, to be NAT translated a second time to the upstream address of the Fios router. I believe this is the same as my answer to question 2 and 3, unless you now are speaking of the TP Link router, and the prior questions are about Fios router.
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I see you note the pihole address is 192.168.0.100 so is on the “inside”" network, but the Secondary DNS:
192.168.1.100
does not match.Correct the PiHole address is as above on the "inside" TP Link network. The Secondary DNS for the TP Link network under "DHCP" is blank. Under Network > WAN it is 192.168.1.1 and 192.168.1.100. Under Network > LAN it is 192.168.0.1
Would setting the WAN DNS on the TP Link to the PiHole fix the issue? For some reason I cannot disable the DHCP as it's all grey.