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seeing an IPCONFIG /all from old server and new server would be helpful
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seeing an IPCONFIG /all from old server and new server would be helpful

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Also do a route print on the new server.
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Its what fixed the problem.
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I have just migrated from a Server 2003 standard to Server 2008R2 standard. The migration has gone great. All of the roles have transferred over and by all accounts everything seems to work correctly. BUT when the old 2003 server is removed from the network the new 2008 server drops almost 50% of the packets to the internet gateway. The new server can PING all of the other device on the local network without dropping any packets. Other workstations on the network can PING the internet gateway without dropping a single packet. When the old server is on the local network the new server can PING the gateway without dropping any packets. I have spent a couple of days trying to get to the bottom of this. Please help!!
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I have just migrated from a Server 2003 standard to Server 2008R2 standard. The migration has gone great. All of the roles have transferred over and by all accounts everything seems to work correctly. BUT when the old 2003 server is removed from the network the new 2008 server drops almost 50% of the packets to the internet gateway. The new server can PING all of the other device on the local network without dropping any packets. Other workstations on the network can PING the internet gateway without dropping a single packet. When the old server is on the local network the new server can PING the gateway without dropping any packets. I have spent a couple of days trying to get to the bottom of this. Please help!!

Server 2003 to 2008R2 Migration

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.

Microsoft Legacy OS

Microsoft server applications are those applications developed specifically, but not necessarily exclusively, on the Windows Server platform. In addition to well-known products like SQL Server, Exchange, Internet Information Services (IIS), Microsoft Dynamics, Forefront, Lync and Sharepoint, they include applications like Skype, BizTalk, Hyper-V, Groove and Commerce Server. Server applications are managed with the Microsoft System Center.

Microsoft Server Apps

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.