I have Librenms installed on a Hyper-V VM. I am trying to use two NICs to listen on two separate subnets, one for our production network and one for management. The system has been stable for several years while connected to only the production network, but if I connect both NICs I am not able to access the web interface. The host OS is Ubuntu 22.04.3 and I believe that both interfaces are configured correctly. Unfortunately, I am typically a Windows admin and am not very familiar with *nix commands. Any suggestions would be welcomed! Thanks!
Surely there are routes on your Unix.
You must establish routes between your subnets.
You will see your routes with
$ sudo route -n
Google can give you a lot of information about the route command and the Linux kernel routes.