(Some Continuity features, like Handoff, use a Personal Area Network, where devices connect directly.) A colleague suggested leaving Wi-Fi on for Continuity features but blocking internet access over Wi-Fi using the Wi-Fi adapter’s MAC address.

I recently encountered an odd iCloud syncing problem that I might have to solve ultimately by connecting to my network via ethernet. Block specific devices from joining the network.Even if someone gets the network password, they still wouldn’t be able to join the network. Create a list of only permitted devices for security’s sake.This can be useful if you’re trying to establish access from outside your network to a service run on a computer or other device on your network. Assign a fixed IP address to a device by MAC.ARP is intended for use by system administrators and is not generally useful as a way to track down computers and people on the Internet. ARP works only within the small group of computers on a local area network (LAN), though, not across the Internet. Using 'arp,' you can in fact determine the MAC address of some computers from their IP address. In Windows, Linux and other operating systems, the command line utility 'arp' shows this information. Most computers allow you to see the list of IP and MAC addresses that ARP has collected there. Using ARP, each computer maintains a list of both IP and MAC addresses for each device it has recently communicated with. The technology called ARP - Address Resolution Protocol included with TCP/IP makes it possible. However, computers connected to the same TCP/IP local network can determine each other's MAC addresses. Simply stated, a computer's own hardware configuration determines its MAC address while the configuration of the network it is connected to determines its IP address. These two addresses originate from different sources. It is usually not possible for a person to get the MAC address of a computer from its IP address alone.

How to get mac address of server linux