Originally published at: http://www.howtogeek.com/195323/do-two-computers-on-the-same-wi-fi-network-have-the-same-ip-address/
When you are just starting to learn about networks and how IP addresses work, it can all seem a bit overwhelming, but with a little bit of study you can understand how it all comes together. Today’s SuperUser Q&A post helps a confused reader learn about how IP addresses work for his Wi-Fi network.
Okay!! then what is happening when windows shows IP address conflict error
An IP conflict error comes up when your internal network assigns the same internal IP to two different computers. The issue with this is that when something comes in to the modem from the outside and then the modem tries to send that on to the right computer, it doesn't know which one it's supposed to go to. One of the easiest ways for this to happen is when you're connecting a laptop and it's connected by Ethernet cable to the router and connected to the WiFi at the same time. This isn't as big an issue since the two are in fact the same computer.
No. DHCP assigns unique addresses for each port. The addresses are actually tracked via the MAC address, which is theoretically distinct for every network adapter ever made.
If you plug in your computer to the network while also maintaining a WiFi connection, the computer will get 2 IP addresses. Furthermore, modern operating systems will assign a metric to the two connections and assign traffic accordingly. Since the Ethernet jack is usually faster, the WiFi connection will sit idle for as long as you're plugged in. (This doesn't always work, but that's how it's supposed to work.)
Usually, IP conficicts happen for one of a few reasons:
1. You manually assigned the same address to 2 computers
2. You manually assigned an address to one computer, and DHCP gave another computer the same address.
3. A computer got an address via DHCP, and the DHCP server got completely reset. Then the DHCP later handed out the same address to a different computer.
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