topic Re: OpenDNS setup on Router in OpenDNS

OpenDNS setup on Router

AbdurRahaman72426 — Tue, 05 Aug 2025 10:15:53 GMT

Hey everyone,
I’ve got kind of a weird issue and wanted to get some clarity.
So I’m using a PPPoE(Dynamic ipv4)connection at home, but I noticed something strange — all the devices on my Wi-Fi are getting slightly different public IPs, even though they’re on the same router.

Example:

144.48.151.129
144.48.151.125
144.48.151.140
144.48.151.132

They’re all in the same range, so I’m guessing my ISP is doing CGNAT or some kind of load balancing in the background.
Now here’s the problem: I’ve been trying out NextDNS, but their filtering breaks because they rely on identifying each device by its public IP — and in my case, that keeps changing. Some devices get filtered, others don’t.
I’ve heard OpenDNS handles this better — like it can still apply the same filtering even if your IP changes a bit within a range?
So my questions are:
1. Will OpenDNS still work properly in this case?
2. Do I need to run the OpenDNS updater on one device to keep things synced?
3. Is there any way to tell OpenDNS to just treat a whole subnet (like 144.48.151.0/24) as my network?
Really appreciate any advice from folks who’ve dealt with this. Thanks in advance!

Re: OpenDNS setup on Router

Enes Simnica — Tue, 05 Aug 2025 11:28:16 GMT

hello @AbdurRahaman72426 I see that ur question is still not answered, so let me help.... U’re likely dealing with multi-session PPPoE or some ISP-side load balancing, which is why ur devices are getting different public IPs from the same subnet. That messes with services like NextDNS that rely on identifying devices by IP.

first question: OpenDNS will likely have the same problem, it identifies networks by IP and not subnets....

second question: Yes, u’d need to run the OpenDNS updater, but it only tracks one IP, so it won’t help if ur devices all get different ones.

third question: No, OpenDNS doesn’t support IP ranges like /24, it works per IP....

I would suggest to use NextDNS with DoH per device, which doesn’t rely on IP. U can assign each device a unique ID/profile, which is it’s much more reliable in setups like urs. And the last option would be to check with ur Isp if u can get a single static IP or consolidate to one PPPoE session.... hope it helps and PEACE!

https://help.nextdns.io/t/x2h9k4q/different-blocklistssettings-per-device

-Enes

Re: OpenDNS setup on Router

MHM Cisco World — Tue, 05 Aug 2025 11:47:40 GMT

I need more detail

This change happened rapidly?

There are only few packets between client abd dns

During this exchange of packet ISP change public IP?

I dont think so.

What NextDNS some time filter and other not? It depend on if nextDNS have info about site you ask for or not.

MHM

Re: OpenDNS setup on Router

AbdurRahaman72426 — Tue, 05 Aug 2025 12:06:45 GMT

DoH is not possible.Because,on my router maximum 30+ user using Wifi. My router doesn't have DoH or Dns over TLS/QUIC.

You suggested DoH per device's, i don't have access all user phone, and any help from isp side is not available 😭