DHCP? SOme devices get different lease times

Komendat Jason 6 Reputation points
2021-09-01T20:52:32.117+00:00

So we have 32 buildings and DHCP scopes for each one all that works etc. We have a new building that replaced one the settings are the same. In that building we have a Scope for the IP phones. In that scope most work fine get their 30 day lease but 2 keep failing and going offline. All we can find is in DHCP they are getting an hour lease vs the 30 days and in the logs I can see about every hour they get a new lease, and go offline while its doing it. I've swapped those phones and the new ones do it. Is there any reason a specific device would get a different lease time then the rest of them? On the devices they are all set to just DHCP nothing special.

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.
1,028 questions
0 comments No comments
{count} votes

3 answers

Sort by: Most helpful
  1. Dave Patrick 426.3K Reputation points MVP
    2021-09-01T21:23:13.983+00:00

    Sounds like there may be a rogue DHCP server. Maybe you can disable for a few minutes to see if another replies.

    --please don't forget to Accept as answer if the reply is helpful--

    0 comments No comments

  2. Komendat Jason 6 Reputation points
    2021-09-02T12:30:23.377+00:00

    No its not a rogue DHCP I can see these 1 hour leases in my actual DHCP server

    0 comments No comments

  3. Limitless Technology 39,461 Reputation points
    2021-09-02T12:45:38.43+00:00

    Additionally,
    I would suggest to wipe out those two Phones or reset to factory default and see if you are getting 30 days lease.

    If the reply was helpful, please don’t forget to upvote or accept as answer.

    Thanks,