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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 '12 at 22:00
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1 Answer

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 '12 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 '12 at 8:41
    
Yes, i think it's a lease issue. –  Vitali Tikaev Apr 13 '12 at 8:43
    
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 '12 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 '12 at 11:10
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