troubleshooting Question

Cisco DHCP Lease Problem with Windows 7

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rickreevesFlag for United States of America asked on
RoutersDHCPWindows 7
4 Comments2 Solutions2349 ViewsLast Modified:
I am having problems with my Windows 7 computers.  It seems to be reelated to Windows 7 and my Cisco routers DHCP.  I recently installed Windows 7 on approximately 130 computers that were previously Winodws XP machines.  I have another 50 or so still on Windows XP.  We are using a Cisco 2921 router with a few VLAN's setup.  The DHCP pools are set up on the router for each VLAN on our network.  

DHCP has been set up on this router for a year and we have never had a problem with it and our XP machines.  Now the newly reloaded Windows 7 computers are having issues.  They worked fine for the first couple of weeks.  The other night I had several of them that when woken up from sleep mode or turned on could not pick up an IP address.  This was only a problem for the Windows 7 machines.  

I verified that the DHCP service was running on the Windows 7 computers.  The computers had the exclaimation point over the network icon and had a default 169.*.*.* address.  Releasing and renewing did not pick up the correct IP adress.  Restarting also did nothing.  Resetting the TCP/IP protocal did not work.  

After an hour of troubleshooting I cleared the ARP cahce on our main 2921 router which did not work.  I then restarted the router and this seemed to solve the problem.  The Windows 7 machines began to pick up a correct IP address.  Everything has been working fine for about 32 hours now.  I am concerned the problem will return.  Are there any Windows 7 Cisco DHCP issues related to the address lesases?  Ideas?

Thank you

Note:  We have one core switch and several IDF switches.  The Windows 7 computers are all part of our largest VLAN, approximately 130 computers.  The computers are mixed model Dell machines.  The probelm seems to be isolated to these Windows 7 computers.

This is the router DHCP entry for VLAN20, for the problem computers..

ip dhcp pool VLAN20-PC
   domain-name *********
   lease 0 6
Marius Gunnerud
Senior Systems Engineer
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