Public resolver 1.1.1.1

Hello
When I try to use your public resolver 1.1.1.1 from this IP address range 102.223.128.0/24, the connection is refused.
Regards

Are you making DNS Port 53 connections? Or is this DoH?

Your ISP is probably blocking it.

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Hello

I try to use Port 53
Regards

No, I confirm that there is no blocking at the ISP level.

Hi, can you share the traceroute/mtr output?

dig @1.1.1.1 google.com

; <<>> DiG 9.11.4-P2-RedHat-9.11.4-26.P2.el7_9.7 <<>> @1.1.1.1 google.com
; (1 server found)
;; global options: +cmd
;; connection timed out; no servers could be reached
• [root@resolver1 ~]# telnet 1.1.1.1 53
Trying 1.1.1.1…
telnet: connect to address 1.1.1.1: Connection refused
mtr
Regards

What steps did you take to confirm that?

And, can you add -b to your mtr command so that it shows the actual IPs? e.g. mtr 1.1.1.1 -b

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Hello Erisa
I contacted the ISP, and they confirmed to me that there is no blocking on their end
mtr

Hi, from the MTR it seems like it could be your gateway or router. It doesn’t seem to leave your local network. Does 1.0.0.1 work for you?

Hello
Yest 1.0.0.1 works:

dig @1.0.0.1 cloudeflare.com +short
64.91.248.18

  • the MTR test for 1.0.0.1:
    image

Thanks. You could use 1.0.0.1 or one of the alternative addresses then. I’m sorry there’s little we can do to fix the 1.1.1.1 takeover by your CPE, either your ISP should be able to fix it (if it’s configurable/firmware update) or you’d have to replace the CPE. It would be helpful if you could share the hardware model for others, if you don’t mind.

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