repeatedly need to enter ipconfig/renew

All my users experience random drops in network connectivity. They need to repeatedly go to cmd and type ipconfig/renew to renew their IP settings throughout the day.  I have a workaround by setting static IP addresses on the system which works well for my desktop users but those with notebooks are constantly having this problem.  Any ideas?  Thanks.
ndsnowmanAsked:
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Dean ChafeeConnect With a Mentor IT/InfoSec ManagerCommented:
Where is your DHCP server?  On a Windows server, router, or other network box?
Locate the DHCP and check the lease time configured. A very short lease time could cause this. Also, and probably more important, make sure you do not have any rouge DHCP servers on the network.
FS-
 
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Drizzt420Commented:
Are you in a domain based environment? Instead of doing an ipconfig /renew, try typing ipconfig /flushdns then ipconfig /registerdns. If those commands restore connectivity, then we can narrow it down to a probable DNS related issue.
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rsivanandanCommented:
There is nothing common about the machines that have this problem????

Take a machine and do this;

netsh int ip reset reset.log

netsh winsock reset

both in the command prompt and reboot the machine. See if that clears up problems on that machine. If yes, then it is a client side issue and if not, then you need to look at your switch.

Cheers,
Rajesh
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Shift-3Commented:
I'd recommend looking at the network hardware first.  There is likely a problem with a switch or the physical cabling.
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Shift-3Commented:
Yeah, rouge servers make network admins see red.
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ndsnowmanAuthor Commented:
yeah, ipconfig/ flushdns /registerdns works.

the dhcp also is hosted on another network box.  the least time is 10 hours and i get people with this problem 2 or 3 times an hour
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ndsnowmanAuthor Commented:
well the problem turns out there was in fact a rouge (sorry, couldn't resist) dhcp server on the network.  i shut that down and everything is working smoothly now.  Thanks for everyone's help.
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Dean ChafeeIT/InfoSec ManagerCommented:
LOL .... where is the word check on this thing!
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