![]() ![]() Your router knows which IP addresses are already in use and won't give them out twice. ![]() Unless your router malfunctions, two devices should never get the same IP address under this system. The device uses this IP for some time until the lease expires, at which point it has to get a new IP from the router. With DHCP, when you connect a new device to your network, your router chooses an available IP address from the pool of options. Public IPs are how the rest of the internet sees any device on your network, but they aren't relevant to this discussion about duplicate IP conflicts. Keep in mind that we're only talking about private IP addresses here, which refers to addresses used on your own network. Think about mail delivery trying to find the right mailbox if two houses on the same street had the same number it's the same way for your home network. If this happens, the network becomes confused by the duplicate IP addresses and can't use them correctly. Check out our explanation of how routers work for more details on this.īecause of this setup, no two devices on one network can have the same IP address. Your router uses those IP addresses to direct network traffic to the right devices. Like a physical home address for receiving mail, IP addresses act as a way to identify your computer on a network. To explain why this is a problem, we must take a step back and look at what IP addresses are for. An IP address conflict occurs when two or more devices on the same network are assigned the same IP address.
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