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I have dhcp server (win server 2008 R2). Got about 30 pc in network. But I am facing problems on 2 of them. I have set IP manually on them. Problem is, that these 2 comps disconnect from network between 2 and 3 pm each day. I thought that it would be problem with leasing time. But I cant find setting, where I can set lease time to static IP, or any kind of other setting which can solve my problem.

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  • any event log entries on these workstations ? Like ip conflict
    – Mathieu Chateau
    Apr 19, 2012 at 22:00

2 Answers 2

Reset to default
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You could look into the logs. Disconnecting should be written in there, and why.

Maybe there is a 'schtasks' set and forgotten.

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Create IP reservation for those two clients in DHCP. http://technet.microsoft.com/en-us/library/cc780311(WS.10).aspx

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  • Do you also think it can be lease problem ?? Or any other ideas ...
    – martin
    Apr 13, 2012 at 8:37
  • Because those two IP addresses were not leased by DHCP, but was manualy requested by the clients. Try to make a reservation pool for those clients.
    – Vitali Tikaev
    Apr 13, 2012 at 8:41
  • Yes, i think it's a lease issue.
    – Vitali Tikaev
    Apr 13, 2012 at 8:43
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    It's not a lease issue... for three reasons: 1. Static ip addresses don't have a lease and therefore don't expire. 2. The problem would affect all DHCP clients, but only DHCP clients, not statically assigned ip addresses. 3. Only if the DHCP server was unavailable to renew the lease would the lease expire and the DHCP clients would lose their ip address.
    – joeqwerty
    Apr 13, 2012 at 10:51
  • If you use a static addresses (which is configured at the device) the correct way is to reduce DHCP lease pool (DHCP range), and then set the device to an ip address outside of the DHCP pool.
    – Vitali Tikaev
    Apr 13, 2012 at 11:10

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