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DHCP IP Lease for SCCM OSD

myquestforLearning 1 Reputation point
2020-08-25T21:59:06.577+00:00

In our SCCM 1910 environment - we have provisioned 5 Win10 based PXE enabled DPs to cater 5 separate VLANs.
Everything works fine with first 10 machines in each VLAN but as soon as we try to build more machines lets say 20 machines from each VLAN, 11th machine onwards - do not get the IP from DHCOP hence OSD doesnt work.

Please suggest what should we keep as the IP lease Time and how can we ensure that the 11th device onwards IP is assigned so that OSD works.

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Microsoft Configuration Manager Deployment
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Microsoft Configuration Manager: An integrated solution for for managing large groups of personal computers and servers.Deployment: The process of delivering, assembling, and maintaining a particular version of a software system at a site.
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  1. Dominique Pollard 46 Reputation points
    2020-08-25T23:48:47.8+00:00

    I would check what the scope usage is on the DHCP server assigning addresses. Is the range limited on available addresses?

    1 person found this answer helpful.
  2. Sunny Qi 11,051 Reputation points Microsoft Vendor
    2020-08-26T06:07:26.033+00:00

    Hi,

    Thanks for posting in Q&A platform.

    Before we go further, may I know the size of address range for distribution of each scope and how long will these clients stay in corresponded VLAN?

    Please refer to the following recommendation for DHCP lease time,

    • For wired devices, a lease time of 8 days is a typical period. Wired devices won’t leave the network often, so there is no reason to create a shorter period. A shorter period only increases the DHCP-related network traffic.
    • Wireless devices tend to leave the network pretty often and can stay away for a couple of days. So a smaller lease of 24 hours is pretty common. This way regular devices will keep mostly the same IP Address.
    • For guest networks and hotspots, you want a short lease time. Hotspots an hour max, while for Office guest networks 8 hours will work fine.
    • Always make sure 20% of the DHCP pool remains available. To calculate the potential amount of devices in the network and add 20%. Increase the pool size or lower the DHCP Lease Time to make it fit.

    Regarding more details of DHCP lease time, please refer to the following article:

    DHCP Lease Time – What is it and How does it work?

    Please Note: Since the websites are not hosted by Microsoft, the links may change without notice. Microsoft does not guarantee the accuracy of this information.

    Hope my answer will help you!

    ---Please Accept answer if the reply is helpful---

    Best Regards,
    Sunny

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