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Yes, your steps are pretty much correct: open PVE terminal, either via ssh or opening webgui on 8006 and then going to Node > Shell use lsusb and write down device address add rule file in /etc/udev/rules.d/ it should contain something like SUBSYSTEM=="usb", ATTRS{idVendor}=="xxxx"...

Maybe your storage is starting to fail? Can you check Node > Disks? What is your storage configuration?

I think iGPU acts just like usual PCI device, can you show Resource Mappings tab?

Can you e.g. create file and fill it with colons/semicolons, and then open console with other browser to see if this is a visual bug or key codes are different?

I think this post might be helpful: PCIe card falls off the bus after vm reboot, how can I automatically reset it

Have you tried temporarily disabling firewall with pve-firewall stop? (wiki link)

I think you need to add pci-stub driver at boot so linux would not initialize it further for proxmox *Untested* steps: identify your GPU with lspci: lspci -nn write down [xxxx:xxxx] part open /etc/default/grub with your favorite text editor and find GRUB_CMDLINE_LINUX_DEFAULT add...

I mean, that goes outside PVE topic, but e.g. my browser Vivaldi allows using Ctrl + 0-9 key combo to switch between tabs; it's also probably possible to rebind to single button

Bond connection will only combine interfaces at the data link (layer 2) level, it will basically work like "one powerful NIC"

In my non-enterprise experience - any computer would do the job, even a quite old one. Primary concern would be getting good disks for RAID-1 storage and possibly ECC RAM

My suggestion would be to find some customisable VNC client and install it on your (I suppose) thin client that runs monitors; though this case also seems more like XY problem, but if its going to work for you - would be cool to know! :)

Do these VMs and containers use DHCP provided IP addresses? Maybe your router doesn't route traffic for hosts that don't have valid DHCP lease?

Have you tried disabling firewall with pve-firewall stop? (wiki article)

Is DHCP lease time by any chance is around the same 5-7 hours you mentioned?

If I understood your issue correctly - maybe your eno3np0 & eno4np1 NICs do not allow MAC-spoofing for some reason?

I would suggest consulting with default firewall rules, just in case you missed some + test that fw does actually work

Do you mean you freeze out of PVE management SSH and Web interface? If so, can you try to disable firewall temporarily to see if issue persists? (wiki article) I believe that it drops packets at some point, but I can be wrong.

It is possible; I believe you would need to: enable "Router Advertisement" in pfSense VM > Firewall > Options attach VM network interface to default vmbr0 bridge and possibly more configuration inside pfSense itself but it is definitely not something that is impossible to do UPD: After...

What's your network topology? Have you tried disabling firewall with pve-firewall stop? (wiki link)

Usually it's a firewall issue, try using pve-firewall stop (wiki) to temporarily disable firewall and then try connecting to these VMs again