Been using XCP-NG on our servers here at work for a few years now after moving off of hyper-v. We run exchange in house here, and in running the health checker script I noticed an error about the packets being discarded. I tried both the xcp and the citrix drivers but the result is the same. There are no NIC power management settings in any of the tabs and I did run the powershell command to disable nic power management just in case but the errors persist. I booted up one of the VMs on the old hyper V server as a test and it did not have these errors. The event lots also don’t have any useful info.
I also tested the MTU and it appears 1500 is correct (1472+28).
Just to follow up on this, I have tested with some other servers and have found it is only the BROADCOM network adapters having this issue. Crappy Broadcom NICs in dell servers strike again.
Actually aligning MTU size obviously the main reason of many miracles. Just fought with bunch of it.
Than we are in bridge/vlan space it may decreases a little bit.