It seems to be a specific problem with VB 6.1.16, MacOS Big Sur Wifi and Win10 Guest. Then I tested my Win10 VM again, but this time using an ethernet cable to the router. Then I installed a new Ubuntu 20.04.1 VM and checked the network bridge, it worked! So it seems something Windows related!
With wireshark I could see, that I got a valid ip-address for a few seconds and the VM communicated with other devices on the same subnet, but then suddenly a DHCP Decline packet comes along and a new negotiation for a new ip-address begins. Then I captured a network log from the VM with -nictrace1. Tried to set a fixed IP-Adress, but didn't work, so back to dhcp. Then I studied Win10 event logs and saw that it complains about "ip-address already in use, will try to get new address", Event-Source: Dhcp-Client, EventId: 1005. Switched back to bridged network and tried different adapters, without luck. Then I realized that my bridged network isn't working anymore. I also updated the VM Guest additions to the latest version. Then I needed to update Virtualbox to 6.1.16 to run my Win10 VM.
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