Does anyone know why this setting is always grayed-out in my Win7 guest? (Parallels for Mac 5.0.9344) The description of the feature sounds like it would solve my problem at home, where my wireless AP will not give out two IP address (one to my Mac, one to my guest) when using bridged networking. Using NAT networking fixes this, of course, but for other reasons I want to stay in bridged mode at work and not have to switch to NAT at home just to get my guest talking on the network. Anyway, the "Send host's MAC address to DHCP server" looks promising, but no matter what I change it never becomes active and "check-able." Is this feature not really implemented, yet, or am I doing something wrong?