I have a unique requirement where I need to disable ARP on a Windows 7 box. In previous Windows versions you could modify the ArpRetryCount in the registry (and set it to 0), but this does not work in 7 (nor does it exist). Does anybody know how, or if this is possible? I've been asked to elaborate this more and I'm not quite sure how. I want to switch off ARP (including gratuitous arp) on Windows 7 for a project I'm working on. You can do this in Linux by simply adding '-arp' when you bring up an interface, but you cannot do this in Windows 7. You could in previous versions by modifying the registry, but this does not work any more. If the fine folk here aren't sure then I don't like my chances...