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Redirecting IP requests

Is it possible to redirect requests from one IP to another, would this be done at the switch or router level.

We had a TFTP server that our IP phones boot to located at x.x.4.216

The address of that server is now x.x.1.51

I would prefer not to manually reconfigure each phone to use the new address, and the 4.216 address is no longer in use, so is it possible to forward all requests that IP to our new TFTP server IP address?
IP TelephonyNetworking Protocols

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What you are asking for is called NAT and can be implemented on a router, provided that the router is between the server and the phone
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A little more thought, if there is a router that is on both subnets, or if the old subnet was removed, you could add another IP address to the router that is the OLD servers address, then configure your NAT (or port forwarding as some may know it as) to the new server address.  This I would consider a bandaid as it is making your network overly complex without much reason.
Networking Protocols
Networking Protocols

Networking software modules are interfaced with a framework implemented on the machine's operating system that implements the networking functionality of the operating system. The best known frameworks are the TCP/IP model and the OSI model. Systems typically do not use a single protocol to handle a transmission. Instead they use a set of cooperating protocols, sometimes called a protocol family or protocol suite.[9] Some of the best known protocol suites include: IPX/SPX, X.25, AX.25, AppleTalk and TCP/IP. Other protocols indirectly related to networking include the hypertext transfer protocol (HTTP) and its related technologies, Dynamic Host Configuration Protocol (DHCP), Domain Name Server (DNS) and other Internet protocols.

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