The IP helper address removes the broadcast destination address of a UDP packet received on an identified interface and replaces it with a specific destination address. The router has been
Design programmed to say, "If a broadcast comes in on this interface, forward it to this destination address," where the destination address is that of the server.
A helper address is configured on the incoming interface. The destination address may be either an individual server or a subnet address. Multiple helper addresses can be identified, and all broadcasts received on the interface will be forwarded to each destination. This is a good way to create backup servers on different segments.
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