Welcome to the Community,
how does the physical network look like. What type/model of switch do you use, and how are the ports - to which the ESXi host is connected - configured.
... but are unable to but any traffic via the nics (e.g. from port-group "External Network" to "GasrNetz Network" members).
Routing etc. needs to be configured on the physical network in order for two subnets (which I assume you are using here) can talk to each other.
if I got you right, you are looking the the direction of the external switch.
Both test VMs are part of one network range (192.168.56.112 and 192.168.56.113). As long as these test VMs are part of the same port-group or same vSwitch --> all is fine.
If I move one test VM to "External Network" (vmnic2) and the other to "GastNetz Network" (vmnic1), they stop talking. In this setup, both nic Ports are connected to a unmanaged (hardware)test switch. And even if I use a direct cable between the two nics --> no traffic.
The only nic with throughput is the vmnic0 - where currently all my VMs are running.
For me - key question is --> what is stopping the traffic to pass vmnic1 or vmnic2.
I hope that answers helps - if not - let me please know.
Is one of the two VMs able to access an IP address on the physical network, once you place them on the separate port groups?
Sorry for delay.
Not sure what you mean with "on the separate port groups", but when ever a VM wants to communicate via one of the two Intel nics - no communication/traffic flow.
As mentioned before - I'm happy to delete the two nics and the relevant port-groups/vswitches and build all new. But if you just remove the nics - reboot - put the nics back in - the is no difference. I believe there is something stored in a config file. Any idea how to do a clean reconfiguration?
PS: If possible, I would like to keep my working on-borad nic an that setup