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This information was important to write in your first post ! It's not needed at all. Docs says you can use NAT from VirtualBox if you want an isolated network for your main network (like a nested network) OR if you want network "Bridged" (=Accès par pont) to your main primary network, you need...

i915 need to be blacklisted with this https://forum.proxmox.com/threads/trying-to-blacklist-i915-module-for-use-by-guest-via-pci-passthru.110217/ but, iirc, there isn't success story passthrough the only Intel igpu.

you need to be sure what is the ip of the cisco.

even without dhcp, it have its own ip even multiple when VLAN. Double check cisco router ip(s), and don't call it "switch" even if it's not the dhcp server.

RDP shoud not be exposed publicly. You need one of them : Firewall rules to accept only autorized static public ip VPN SSH (RD Gateway for enterprise with AD )

have you touched firewall rules ?

gateway need set to Wired section not Loopback...

Backups to to a slow Proxmox Backup Server can slowdown source VM up to freeze or crash. There is the fleecing function to workaround.

to confirm within guest network conf error, boot from Live Debian or Ubuntu

You can't backup to more than "one" destination tu use dirty-bitmap. If you have another Proxmox Backup Server, you need to use Sync.

I hope you mean RAID10. is ZFS ? or EXT4 over HW RAID ?

oh my bad, my english is very too bad !

Sharing your findings would be nice.

as docs says : "Installing additional packages could lead to a hardly upgradeable system and is not supported from the Proxmox support team and therefore only for expert use." You need time to try, dig and learn on how it works. Your links is a good start.

is tech preview nftables firewall enabled ?

try without your bond, fast test with only 1 ethernet cable.

because pve side writecache is another cache in addition of the guest os writecache which is another cache in addition of disk cache itself. if guest os or host crash or power lost, data lost can prevent boot guest os or corrupt app data within guest. it's unsecure for production server. I'm...

https://forum.proxmox.com/threads/zfs-raw-vm-taking-up-full-space-after-migration.134943/

indeed SDN doesn't work with OVS https://forum.proxmox.com/threads/proxmox-sdn-openvswitch-and-linux-bridges.134698/post-639498 as always, post configs , no one can guess ! Post into tags (no screenshots) output of cat /etc/network/interfaces cat /etc/network/interfaces.d/sdn head -n-0 *...

zfs install ?