Meraki dashboard connectivity lost after setting 1.1.1.3 DNS

[SahadSalmiT]

Hi Guys, 

 I faced an issue when one of our engineers set the DNS as 1.1.1.3 in DHCP, the Meraki devices received that DNS lost connectivity with the dashboard, once the change reverted it regain the connectivity.

    I tried to "nslookup" dashboard.meraki.com, api.meraki.com and config.meraki.com with both 8.8.8.8 and 1.1.1.3, seems to be both DNS servers are resolving the DNS. What could go wrong here?

[alemabrahao]

Have you tried with OpenDNS?

I particularly prefer OpenDNS.

[SahadSalmiT]

Nope, the company requered to setup 1.1.1.3.

[alemabrahao]

As far as I know, Cloudflare IP is 1.1.1.1

 

[SahadSalmiT]

this one is bit aggressive and blocks malware and adult content. 

[alemabrahao]

This is a false sense of security, there are other tools that are much more effective at doing this.

Zscaler is an example. But that's okay, it's your choice.

[Brash]

Seems odd on the face of it.

Do you have anything upstream blocking DNS lookups to 1.1.1.3?

[SahadSalmiT]

Not at all, and on one site it didn't go offline for a few days and one day suddenly go offline. Reverting to google DNS fixed it immediately.

[PhilipDAth]

Is there an upstream firewall that might be blocking access to 1.1.1.3?

[SahadSalmiT]

nope, no upstream firewall. All are directly connected to ISP.