I have the following setup: Dell R720 Server with Esxi 6.5 running on it. On this esx, there is a pfsense-vm. The first network-adapter of this host is connected to fibre-internet with a media converter. The second adapter is connected to a LTE-router. The pfsene is connected to this adapters. If I select the fibre-connection as default IPv4-Gateway in the pfsense, I got up to 15% packet loss while pinging 126.96.36.199 from the pfsense shell. After switching the gateway to LTE, there is 0% loss. If I ping my IP from the outside, I only got < 1% lost packets (7 of 2500 packages are lost). The loss already occurres if I ping the second ip-adrress traceroute gives me (the first one after my pfsense).
The gateway overview of the pfsense shows me:
Fiber (default) 185...* 185...* 3.771ms 3.06ms 19% Warning, Packetloss: 19%
The ISP says "everything is fine, the problem is your configuration".
Next week I will directly connect my notebook to the media converter and repeat the test, but at the moment, I have no physical access to this server.
What do you think? Sounds like configuration problem on pfsense, esx or broken media converter? Is there a possibility to track these lost packets?