ZyXel Routers and Cincinnati Bell ISP

dns

#1

Greetings,

I apologize if this has come up before, but my search didn’t turn up anything. I am trying to get my ISP issued router to utilize CloudFlare DNS servers. I have them set in my configuration, see attached screenshot, for both IPv4 and IPv6. I have tweaked all the settings I can. Though the published tool says I am talking to CloudFlare DNS, the router’s configuration page shows a Cincinnati Bell DNS still in place. I have tried renew/releases from the box, and have set everything relevant to manual configuration. I have attached another screenshot of the relevant configuration page information. I was just wondering if this is something that can be changed. If not, how to I absolutely verify I am pulling from the CloudFlare servers other than the tool as my external IP hasn’t changed?

Router model is VMG4381.

http://dnsviz.net/d/www.example.com/dnssec/


#3

Screenshot 2.

DNS%20Server%202


#4

#5

First screenshot didn’t take, so deleted the reply and re-posted.


#6

You already have a “tool” for it:

image


#7

Yes, and I used said tool as linked, however my router is reporting differently if you look at the screenshot 2, which is from the configuration page of the router.


#8

You could try the following dig:

$ dig ch txt version.cloudflare +short

1.1.1.1 will return something like:

"Release Version: 2018.6.6"

Another resolver (8.8.8.8 or 9.9.9.9 for example) would return a servfail response. I’m not sure this is a totally conclusive test because I’m not sure if your router’s internal DNS proxy will successfully relay that query.