u/CM-Burns

I've got an IPC running alpine Linux and configured with an IP in /26 subnet. Gateway is set and reachable

It is possible for the ipc to ping a remote server but not the other way round. If running tcpdump on the ipc, I can see that there is a reply being sent back to the server but that one still says no response. Changing server from Ubuntu to Windows server = same result. Changing alpine to Ubuntu, same result. Swapping the IPC for a Windows laptop with the same network settings, switch port and cable makes ping successful between both devices. Does anyone have an idea where to continu from here? I'm lost..