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The issues of two DHCP servers in the same LAN

If you have two DHCP servers running in the same LAN, you may experience some issues.

Case 1: The client has been using as router as DHCP server for two years. After the client installed a Windows SBS. 2003. Some computers have problem to access the Internet.

Cause: the SBS has DHCP enable but not DNS. If a computer is assigned IP by the SBS DHCP without DNS.

Resolution: Disable the DHCP on the router and install DNS on the SBS. Reconfigure the DHCP option to setup DNS.

Case 2: The administrators was told that some computers cannot access the file server.

Cause: one technician added a wireless router and enabled the DHCP using different subnet. When some computers renew the IP, they may receive different IP addresses.

Resolution: Disable DHCP on the wireless router.

Case 3: Some of computers receive The system has detected a conflict for IP address  message.

Cause: The client just add another wireless router which is also DHCP server. Disabling the DHCP on the wireless router fixed the probelm.

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