![]() For urgent issues during business hours call 73. Provide them with the suspected duplicate IP and they can investigate. In the photo below you can see a Surface Ethernet Adapter (100mbit, model 1552) sitting above a Lenovo USB 3.0 Ethernet Adapter, one clearly shows the MAC address. Here is where you add new hardware identifiers. On the Client Approval and Conflicting Records tab, under Duplicate hardware identifiers section, click Add button. On the Home tab, select the site and choose Hierarchy Settings. What you will see however is the serial number which just so happens to look like a MAC address. In the Configuration Manager console, go to Administration > Overview > Site Configuration > Sites. If you don't have access to a third host on that same network or don't have command line access, submit a help request ticket and assign to ITS - Network. The MAC address is no where to be found on the back of the Surface Ethernet Adapter. If you get any MAC address in your output, it should be from another host using that IP. ![]() Wait a few minutes, then run the ARP command again. If the MAC address in the output is always the affected host, try unplugging that host from the network.You should be able to use NetDisco or DCT to track that host down. If the MAC changes, then you know another machine is trying to use the address. If so, then try running the command a few more times.You should be able to use NetDisco or DCT to track that host down via MAC address. If not, then the MAC address in the output is the MAC of another machine that has the same address.Compare this address to the affected machine. The output of the response should contain a MAC address.On a Mac or Linux machine, type "arp " and hit enter.On a Windows machine, type "arp -a " and hit enter.On an unaffected host on the same network, open up a command prompt. ![]() The ARP cache of a machine contains IP to MAC address mappings, which every host needs to communicate with hosts on the same network as its own. If you have access to a working host that is on the same VLAN as the duplicate IP, you should be able to detect the MAC addresses of the affected hosts by checking its ARP cache. You may also see intermittent "network unavailable" messages from the OS. If a host gets a duplicate IP but its OS doesn't detect it, you'll see a valid address assignment, but network connectivity will just not work, or at best will be intermittent. ![]() Most newer hosts (Windows, MACs, Linux) will actually detect a duplicate IP assignment and will generate a "Duplicate IP" error message.
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