Limitations of DHCP

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Limitations of DHCP

Although DHCP can substantially reduce the headaches and time required to administer IP addresses, you should note a few limiting characteristics of DHCP:

DHCP does not detect IP addresses already in use on a network by non-DHCP clients. These addresses should be excluded from any scopes configured on the DHCP server. This problem was fixed in service pack 2 for NT4.0.
A DHCP server does not communicate with other DHCP servers and cannot detect IP addresses leased by other DHCP servers. Therefore, two DHCP servers should not use the same IP addresses in their respective scopes.
DHCP servers cannot communicate with clients across routers unless BOOTP forwarding is enabled on the router, or the DHCP relay agent is enabled on the subnet.
As with manually configured TCP/IP, incorrect values configured for a DHCP scope can cause unexpected and potentially disastrous results on the internetwork.

Other than the IP address and subnet mask, any values configured manually through the Network Control Panel Applet or Registry Editor of a DHCP client override the DHCP server scope settings. If you intend to use the server configured values, be sure to clear the values from the host TCP/IP configuration dialog boxes. Enabling DHCP on the client host does not automatically clear any preexisting values, although DHCP clears the IP address and subnet mask.

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