WOL problems "halt"

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http://www.unix.com – Hello, sry for my bad english, is not my native language I have a XenServer, and XenServer runs on a RedHat linux system. So i would start my xenserver with wake on lan. I configured the network card with the ethtool: the option "Wake-on: g" The option for wake on lan in the bios and in the properties of the xen server is also on. When i shutdown the xenserver, the network card goes completly offline. No led lights. So the WOL doenst work... How can i configure linux, so that the network goes not complettly offline when the server is shutdown? Thank for help. (HowTos)