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Weird, might need more help than I can give. did you try to do passthrough or such on the system with the old motherboard? did you add the old proxmox boot drive to the new motherboard and start there? What version of Proxmox are you using? by the lspci details I would expect you have...

Post in thread 'Unknown devices (ifconfig)' https://forum.proxmox.com/threads/unknown-devices-ifconfig.42407/post-203988

What is the output from the following two commands? lspci | grep Ethernet ip a

Well looks like a realtek ethernet controller card at PCI 0000.04.00.0 is there, but not showing up with ip a. I would expect that realtek card to be enp4s0f(0-3) with ip a if a 4 port card. I will amend my earlier guess and state that 1. 4 port Intel i350 card at PCI 0000.01.00.(0-3) and...

From the command line what is the output from lspci | grep Ethernet

To be clear on this proxmox node you have two 4 port PCI ethernet cards (8 ports total by PCI) and I assume eno1 is the nic attached to the motherboard? I also guess that enp1s0f(0-3) are on one PCI card and enp(8&9)s0f(0&1) are on the other pci card. If I understand you correctly, then the...

How many nics do you have on the proxmox node? If at least 2, you can take it slowly and setup vmbr1 (without a gateway) with a static Proxmox address (192.168.200.2 for example) in the 192.168.200.0/24 subnet and use the second nic as bridgeport. Connect that second Proxmox nic to the...

What is the result you are not happy with? From Proxmox What are you physically connecting enp8s0f* and enp9s0f* to? Is LACP configured and working on that other end of the connection?

Read through the webpage below to get a feel for what will need to be done. https://www.servethehome.com/how-to-change-primary-proxmox-ve-ip-address/

In order for you to use LACP whatever is on the other end of the connection would also have to handle LACP. Typically it would be a switch, proxmox node or router that does LACP. If you want to plug separate things/devices into those 4 ports then you could use a broadcast bond. Regardless, yes...

As stated use VirtIO (as the name suggest e1000 is limited to 1g max) and consider setting Multiqueu to however many cores you have given this VM.

Not sure why this doesn’t work for you. Maybe try a different approach and use Linux bridge which is not vlan-aware and specifically define the vlans on the bond as the example below and see if that works for you. Example: Use VLAN 5 with bond0 for the Proxmox VE management IP with traditional...

Are you using vmbr0 or vmbr0.4 with the VM’s/lxc?

I have been unsuccessful getting ipv4 multicast to cross my linux bridges to my ruckus icx7150 switch, I can get ipv6 multicast. Some folks have no issue ... others no luck with multicast. Not sure what the magic combination is.

Out of curiousity where or how exactly are you changing things in the VM? AS you figured out Virtio should almost always be used instead of e1000

@arminanton not sure that pi setup is the way to go with ifupdown2 and proxmox. Not part of your question, but Proxmox should have a static address somewhere so that can reliably get to it from the network. you may already have this if not all of /etc/network/interfaces is copied over. Couple...

I can't help further on OVS as I have only used it briefly, sorry. Let me preface this next question by saying that I understand the innate desire to optimize and squeeze out every bit of speed possible. I subconsciously feel the same way. Specifically on VXLAN: What are you transferring...

You consider using the RSTP Loop Setup or Broadcast Setup from that page and creating vlans on top of that? also consider @spirit vxlan ring network recommendation as well as a Batman ring networking from the thread below...

It's not yet implemented from the gui, but is doable today and can be automated with pbs-client for your disaster-recovery. https://forum.proxmox.com/threads/backup-pve-using-pbs.80045/post-355138

Do you really need a crossover lan cable? Which of the 2 is connected to the internet? Do you also have an ISP router between the internet and either Pop OS and/or Proxmox node? You can set up a router/firewall VM on proxmox and connect that to WAN and put both Pop OS and proxmox behind that...