Getting disconnected from a VM after a while

[nouserx]

Hi

 

I hope you can help me figure out a network issue. To be honest, I don't need to fix it necessarily since almost all machines are running in a virtual HOME LAB (Proxmox) which I have been practicing with for a while to lean something new.

 

I installed OPNsense as a VM in Proxmox 8 to practice with this   firewall. It gets an IP (its main WAN port) from my physical router   which manages my home LAN. I set a WAN pass rule in OPNsense to allow my pc on my physical LAN to  get access both to OPNSense GUI, VMs and physical machines on its  internal LAN. Of course, I also set a route up on my Home router to reach the Opensense VM's  LAN. From my physical PC on the HOME LAN. I can ping the laptop connected to a Proxmox NIC that is on the  OPNSense LAN. So far so good.

 

However, when I connect to the laptop via Windows RDP  a problem occurs  that I can't still manage to get my head around, after I log in the  connection gets closed after a while (from 10 to 20 secs), sometimes I  can't even connect to the machine.

 

 

 

I get the same problem if I want to connect to the laptop via a SSH connection (putty).

So,  I ran Wireshark on my Windows machine to try to figure out this issue. I don't know if the screenshot below can be of any help:

 

 

 

I also ran tcpdump on proxmox in the hope of catching something meaningful. Here is a couple of screenshots:

 

 

 

 

 

IP 192.168.9.10 is my laptop address on the OPNsense LAN. 192.168.3.100 is my physical PC IP. AFAIK, I don't think that the problem has anything to do with OPNsense. I have the same problem if I run a Mikrotik x86 VM with pretty  much the same network setup in Proxmox.

 

Could you help me figure it out please? Thanks