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DHCP - Issues a 1 hour lease instead of configured 8 hour lease RRS feed

  • Question

  • Hello,

    I have been troubleshooting an issue with DHCP and on a side note noticed that the lease that some clients get is 1 hour instead of the 8 hour configured lease time. Looking into it further the hour is the Maximum Client Lease Time (MCLT) because we have 2 DHCP servers set up with failover in a 'load balanced' configuration. Once the hour is up it then renews with an 8 hour lease. I have been referring to these articles primarily:

    What I can't seem to work out is why it's only sometimes that it gets the 1 hour lease time. For example on one PC if it boots from cold it gets a 1 hour lease, a different PC that boots will get an 8 hour lease.

    Does anyone know the difference between why it gives a 1 hour (MCLT) vs an 8 hour (which we have configured)?


    Wednesday, July 18, 2018 11:09 AM

All replies

  • Hi,

    Thanks for your question.

    In theory, when a client sends a request for a new lease, it will get lease for MCLT duration. When the client attempts to renew the lease at half the lease period i.e. MCLT/2, it will be given the scope lease duration if DHCP failover is in NORMAL state.

    This is as per the DHCP failover protocol. 

    Best regards,

    Travis


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    Thursday, July 19, 2018 9:20 AM
    Moderator
  • Hi,

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    Best Regards,

    Travis


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    Tuesday, July 24, 2018 5:24 AM
    Moderator