Zyxel nebula dashboard says switches are offline

Lorcan

Hi, I believe the information on the zyxel nebula website is incorrect.

We have all 4 switches online, by this I mean they are working as switches within our internal LAN. PCs, phones, printers, etc. are all connected to the 4 switches we have. And the devices are assigned IPs by an ISP modem connected to the switch.

What is strange is that the Nebula dashboard says the switches are offline.

Does anyone know why that is?

Zyxel_Adam

Hi Lorcan, 

Thanks for sharing this information.

May we know if NCC Dashboard of your site still shows offline for all switches?
If so, please provide us your Organization name and enable Zyxel support at Help > Support request page (enable it and click SAVE button) so that we will be able to access your organization then check the issue.

SLMark1

We see this all the time when the primary DNS is not responding in a network. A good example is if there is a DC in the network and it is offline. The nebula hardware does not seem smart enough to move to the second DNS option under the DHCP configuration. We are leaning towards starting to statically assign all the network hardware because of this. Something we stopped doing years ago. It is a major issue if you ask me. We get false down alerts all the time.

Zyxel_Adam

Hi @SLMark1,

Thanks for sharing this information.

Our switch has the same behavior in either DHCP or Static IP configuration, so once switch is unable to get a reply from first DNS server, it sends packet to both DNS address you configured and see which DNS server respond to switch first.

• May we know how do you determine that your primary DNS is not responding to your network?
• May we know if you use local DNS address as switch first DNS?