Dell Optiplex 3080 Micro & Network Drops

[Cod]

Hi

I have installed Proxmox on a Dell Optiplex 3080 Micro. I noticed issues with the VM console and the web interface intermittently stop responding. Digging further, when running a continuous ping to the host I am seeing drops. Around 10% of the pings never receive a reply.

I am running Version: 7.3-1 - I have installed all the available updates from the community repository.

I am confident it isn't a network issue. Devices on the same switch don't have any issues at all and has been worked for a long period. I installed Windows 10 on the same hardware and pinging works flawlessly.

The NIC is using Realtek RTL8111HSD-CG

Does anyone have any thoughts or ideas please?

I am not a Linux expert (Work with Windows usually) so please go easy!

Thank You!

 

[Cod]

I updated the Kernel to 5.19 using the below commands and it did not resolve the issue.

apt update
apt install pve-kernel-5.19
reboot

Any ideas please?

EDIT: I should probably add this

root@VH01:~# lspci | grep Ethernet
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15)

 

[Cod]

So I have made some progress. But still not sure what’s happening.

The issue happens when I use my Unifi Flex Mini and Proxmox.

If I use my Unifi switch with Windows on the same hardware. No packet loss.
If I use a Cisco 2960G (taken from my Cisco cert lab) with Proxmox on the same hardware. No packet loss.

Can’t seem to see anything in Unifi to fix this.

Any thoughts please?