The second least significant bit of the most significant byte of the MAC address is set to 1. In order to prevent conflicts when your Mac is simultaneously connected to one of your SonicWALL's network interfaces through en0 (or has been connected shortly before establishing the VPN connection), VPN Tracker uses a slightly modified version of your en0 interface's MAC address : This permits administrators to make reservations for specific IP addresses on the DHCP server for the VPN Tracker clients, no matter which of their network interfaces they currently use. VPN Tracker always bases its MAC address on the en0 (*) interface's MAC address, independent from the actual network interface that is being used (e.g.
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