Window7: an Access Denied error occurs when setting the ARP table. In Windows, the command for setting the ARP table item is arp-s <ip> <mac>. However, this command cannot specify an interface to add. Windows will select one for you. This is obviously not acceptable. The command for adding an ARP table entry to an interface is arp-s <ip> <mac> <interface-ip>, and the last one is the ip address of the interface. However, an Access Denied error occurs after you try it. Shit !!! Www.2cto.com seems to have changed the setting method in Windows. The correct method is as follows: netsh interface ipv4 add neighbors "Local Area Connection" inetaddr MAC for example: netsh interface ipv4 add neighbors "Local Area Connection" 192.168.0.1 00-24-01-d2-3a-bd where "Local Area Connection" is your Interface name rather than the IP address. Run the following command to obtain the Interface Name: netsh interface show interface author srzhz.