Specifications

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VMware GSX Server Virtual Machine Guide
To set the virtual machine’s Ethernet adapter to promiscuous mode, you must launch
GSX Server as root because you must have read and write access to the VMnet device.
For example, if you are using bridged networking, you must have access to
/dev/vmnet0.
To grant selected other users read and write access to the VMnet device, you can
create a new group, add the appropriate users to the group and grant that group read
and write access to the appropriate device. You must make these changes on the host
operating system as root (su -). For example, you can enter the following
commands:
chgrp <newgroup> /dev/vmnet0
chmod g+rw /dev/vmnet0
<newgroup> is the group that should have the ability to set vmnet0 to
promiscuous mode.
If you want all users to be able to set the virtual Ethernet Adapter (/dev/vmnet0 in
our example) to promiscuous mode, you can simply run the following command on
the host operating system as root:
chmod a+rw /dev/vmnet0