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Azmidiske
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Contributor

Unable to capture packets in the same subnet of a virtual network in a virtual machine on Big Sur

Is there a bug or feature request to get the following issue resolved where traffic is unable to be captured from a virtual subnet when an interface is in promiscuous mode on Big Sur? It is still an issue as of Fusion 12.2.0. The workaround is not reasonable, especially when working with potentially malicious traffic or running network experiments in a virtual machines which require realtime traffic introspection. At this time, we have to run older OSX operating systems when this feature is needed (which is not desirable). Further, as of Fusion 12.2.0, support for Catalina is being deprecated per the latest release notes.

https://docs.vmware.com/en/VMware-Fusion/12/rn/VMware-Fusion-12-Release-Notes.html

Users are unable to capture transfer packets in the same subnet of a virtual network inside a virtual machine.

Virtual machine's virtual interface doesn't report packet exchanges between other virtual machines in the same subnet on Big Sur hosts.

Workaround: Use the virtual interface on the host to capture traffic information in the subnet. For example, use the interface bridge100 on macOS host to capture the traffic in the subnet.

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