You can determine this subnet by referring to the Network system preference on any Mac that is connected to main LAN. It runs a DHCP service, which hands out IP addresses to devices automatically, to avoid the need to manually configure them. The router will decide which subnet is being used for the main LAN.
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Each device on a LAN has an IP address comprising four numbers separated by full stops the subnet is typically defined by the first three numbers. The key to running multiple LANs side by side is that they operate on different subnets. Alternatively, you can use USB-3-to-Ethernet adaptors, which are available from third parties. You can add Ethernet ports via Thunderbolt-to-Ethernet adaptors or USB-C-to-Ethernet adaptors, which are available from Apple.
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Most Macs have just one Ethernet port built in, apart from the Mac Pro which has two.
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This requires the Mac to have two Ethernet ports, in order to connect it to both switches.
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Setting this up does require a bit of knowledge of IP addressing, so if you are not familiar with this topic, we would advise you to research how IP addresses work on local networks before proceeding. Smaller PoE switches are less expensive, use less power, and are quieter.
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Our macOS CCTV software SecuritySpy allows you to set up an effective video surveillance system of any size, in both home and commercial settings.