A mobile device gets 2 IP address in DHCP server

Lê Phùng Hiến 61 Reputation points
2021-02-26T15:03:21.267+00:00

Hi guys, I created DHCP server on Windows server 2016 (ver 1607 (build 14393.4225). When mobile devices join my network, I see some devices show in address leases take multi IP address with difference Unique ID. What happen with them? Could you please help me resolve this problem? ![72551-dhcp.png][1] [1]: /api/attachments/72551-dhcp.png?platform=QnA

Windows DHCP
Windows DHCP
Windows: A family of Microsoft operating systems that run across personal computers, tablets, laptops, phones, internet of things devices, self-contained mixed reality headsets, large collaboration screens, and other devices.DHCP: Dynamic Host Configuration Protocol (DHCP). A communications protocol that lets network administrators manage centrally and automate the assignment of Internet Protocol (IP) addresses in an organization's network.
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  1. Sunny Qi 10,906 Reputation points Microsoft Vendor
    2021-03-01T06:11:29.763+00:00

    Hi,

    Thanks for posting in Q&A platform.

    Based on my knowledge, the Unique ID in DHCP server means MAC address of the DHCP client. DHCP server assign available IP address based on MAC address of DHCP client. According to the provided screenshot, the DHCP client with same hostname but has different MAC address.

    Please help to confirm if these DHCP clients are different mobile devices or the same mobile device.

    If they are the same mobile device and if it has several interfaces, every interface will has its own MAC address, DHCP server assign IP addresses according to the different MAC address, the behavior of DHCP server is normal.

    If they are different mobile devices, the behavior of DHCP server is normal as well. Although the hostname of these devices are same, the MAC addresses are different, as above working flow, the behavior of DHCP server is normal.

    For more details regarding how DHCP works, please refer to the following article:

    How DHCP Technology Works

    Best Regards,
    Sunny

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