Intermittent DHCP Problem, drving me mad!
When the problem happens the PC fails to get an IP address and assigns itself a 169 address. Attempting to release and renew doesn't seem to work, but doing one of the following allows it to pick up an address again:
disconnect / reconnect the network cable
disable / enable network connection
restarting the PC (most of the time)
changing the speed of the card or making driver alterations
Updating the network driver
Setting the network card speed permanently to 100mb
putting different images on the PC's
The network cards are 1 gb Broadcom net extreme 57xx
The problem seems worst in 2 or 3 rooms although I am seeing the same dhcp events on other PC's as well so I can't rule them out.
I have spotted in DNS that PC's in one of the troublesome rooms share IP's with other PC's. Could this cause this type of problem? If so, I'm not sure how it then works if you disconnect reconnect the network cable.
This problem is drving me mad because of it's intermittent nature so if anyone has any clues that would be much appreicated.
duplex and DHCP addresses...
If you have added a range of ip addresses to your DHCP server, they might not be used - if they are a new subnet. So you might still be running out of addresses (just a thought).
Worth right clicking on each scope/range on the DHCP server and getting the stats, to see if ip addresses are being used (or used up) - assuming you have more than one DHCP scope?
Oh yes I ought to mention, that 100Mb half duplex is worth trying - sometime you can get duplex errors between different NICs (only on 100Mb afaik)