Wake On Lan Disabled ESXi

Hi All,

        I have to test DPM feature in ESXi 4.1 machine.I am using Intel Xenon processor model s3420 model. While enabling the DPM it is telling to enable the Wake on Lan.Network adapter saying that wake on Lan supported "NO".But the wake on Lan enabled in Server BIOS.

        Any suggestion to enable the wake on lan using the Vsphere?

-venkat