This has been showing up in my routers configuration for ages. I have heard that this is some kind of network error. Sometimes (like tonight) the Internet connection is very unstable; to the point where Windows will disconnect from it (but Linux hangs on to it). It's so slow, that even uploading the two screenshots in the attachments took just over a minute. When I Ping 0.0.0.0, I get replies from localhost/127.0.0.1

Also, I have recently taken my home server offline. I still have the ports forwarded, as I am considering putting it back online. Could that be a problem?

The first attachment ("Screenshot.png") is my router's configuration. The second attachment ("Screenshot-1.png") is what happens when I ping 0.0.0.0...

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If I run this command on my Linux system at the moment, I am asking for the route table entry involving the IP address '192.168.1.254'. That happens to be the IP address to which packets are routed by "default" on my system:

this is the command's output:

these are the headings for the columns:


if I add the 'n' option to the command, I'm asking for the same information, but without translating numeric values to their associated names:

in that form the command outputs:

in other words, in local routing tables, the IP address 0.0.0.0 instead of a special destination address, designates the "default" route, the route that is used if a route for a specific destination, or group of destinations, is not in the routing table.

HTH.

The 0.0.0.0 in the router could be a loopback interface on the router or a svi on the router , my guess is a mistake on the part of the huawei guys if you unplug all your devices and this still shows up.
Another posibility is that your dhcp server gives leases even upstream in the provider network , this is not uncommon for cheap cpe's to listen on all interfaces for dhcp requests.