How can I monitor VMs are running and connected to the internet? Linux based VMs with proxmox.

I have a few VMs that I need to access the internet. Occasionally the VM is running but the network seems to have disconnected and I need to reboot the VM. Is there a way to monitor within Linux that outbound connection is working and get notifications if it stops? The main line on proxmox never has an issue. Just the connection within Linux VM.