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DHCP fails to operate with ip-helper after moving from 2000 Server to Server 2003
I have a Cisco 3750 switch with a vlan using the 'ip helper-address 192.168.90.4' command which passes DHCP requests to a Windows server. It has worked fine for years with a Windows 2000 DHCP server responding, but will not work with a replacement Server 2003 DHCP. No address assignment is made to the client. The 2003 DHCP server is working fine otherwise, serving addresses to the LAN and other remote networks separated by routers using similar ip helper commands. I applied KB950574 and this did not help. Has anyone seen this problem or know a solution?
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Maybe check the Windows Firewall on the server and ensure it is allowing the correct ports for DHCP. The client uses port 67 and the server uses port 68.
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Someone had used windows route map to allow connectivity between the old server and the vlan. Needed to provide ip routing for the new dhcp server to resolve.
Windows Server 2003
Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).
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