We run an SBS server which looks after a network of about 60 XP clients. We also have secondary DC and DNS server. The SBS server is acting as the only DHCP server on the network.
The problem I have is that the XP clients are looking for a new DHCP lease every time they boot. If the SBS server is down, they get an APIPA address. This can happen in day 1 of the lease. I know that clients will look to renew the lease at 50% of the duration, but this is happening every time. My understanding is that a client should be able to retain a newly obtained lease if the DHCP server is down. Is this correct?
I'm pretty new to all this, so I may missing something. At the moment, even having a secondary DC and DNS server has no real benefit because if the SBS server goes down, the clients lose network connectivity.
Please could someone advise why this is happening?