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what does your I/O delay performance look like?

Are you trying to connect hosts directly (without an intermediate switch)?

I'm not sure I understand the technology you're referring to - is it vmware NSX? There is a development feature on proxmox, documented here https://pve.proxmox.com/pve-docs/chapter-pvesdn.html which might be relevant

Maybe I'm not reading this correctly but from what you've posted, the Mellanox only has a single port?

Is this on the same 192.168.1.0 subnet as the proxmox host?

if the data is VERY important you might want to thinking about backing up the drives *before* you attempt any recovery procedures - doesn't have to be a pair of nvme drives, you just need to save an image of each of the drives before making any changes. After that, you might find some answers...

Would this config solve the problem? Internet-->ISP Router--><R1>---<DDOS>--><R2>--><Target> ^ | +-------------------------+

have you seen this https://www.servethehome.com/two-fanless-intel-celeron-n5105-4x-2-5gbe-options-reviewed/ they mention running pfsense under proxmox as well - although they did it with nic pass-through worth asking in their forums perhaps?

Have you tried to benchmark host-to-host, perhaps using iperf? would give you a baseline indication and indicate if the issue is host or vm related....

Sorry, didn't fully read your question. Having a private VM host network on Proxmox is fairly common particularly when running in a hosted environment. The usual way is via iptables command which need to manually added to the hosts /etc/network/interfaces file Here's an example auto lo iface...

see https://tailscale.com/

It looks identical to the Virginmedia ISP routers we get here in the UK. Q1: Is the Ziggo box running with 'normal' settings - or have you disabled the wifi and dhcp functions (called 'Modem Mode' here in the UK)? Q2: Have you considered how your home wifi is going to work afterwards?

If you have two network interfaces why not just use one as LAN and the other as WAN with pfSense between them? No need for vlans at all

have you watched this youtube video https://youtu.be/z59_MWWPL-Q

If only the VM traffic needs to go through pfsense create virtual network bridge not attached to any physical port on the host - e.g vmbr2 create a pfsense vm with 2 nic, one attached to a real nic with a route to the internet, the other attached to vmbr2 assign an ip to the 2nd nic as the...

How many network ports are on your pc? It's easy to do with 2 or more network interfaces, harder to do with a single network interface and usually involves VLANs

I don't think 192.168.56.0 is a valid IP address for the host - only 1-254 are allowed, .0 and .255 are reserved

There is no mechanism for sharing disks between VM's apart from the usual nfs or samba filesharing.

Apart from the fact that your manual config settings had no netmask, I'm out of ideas

This is normally down to the nic interface names changing - please post the output of ip a on the host and the contents of your /etc/network/interfaces file