port of mirror on a vswitch

did someone knows if it is possible to mirror a port on a vswitch so I can have a Network Monitor capture traffic from a guest operating system software?

It's on esxi 4.1

It is not possible, in terms of specific port, I think not, but you can watch using the Mode "Promiscuous" on your PortGroup or vSwitch.

http://KB.VMware.com/kb/1004099

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