High Quality Content by WIKIPEDIA articles! A UDP Helper Address is a special router configuration used to forward broadcast network traffic from a client machine on one subnet to a server in another subnet. This is used primarily in business environments as way to save money by not having to buy a server for each subnet. In networking every machine is given a unique IP address. Groups of machines with similar addresses are considered to be part of the same logical subnet. One method of assigning IPs is DHCP in which IPs are given out by single server machine. Normally this machine is on the same subnet as its clients and can answer to their broadcasted DHCP requests. However, in some situations the server is on a different subnet. The problem with this is that most routers in their default state do not pass broadcast messages to machines outside the physical subnet. Such messages are essential to the normal operation of certain network services such as DHCP.

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