Configuring IP Helper to Manage Broadcasts
The ip helper mechanism is an excellent way to forward certain broadcast traffic for manageability and inter-WAN communication. The interface configuration command ip helper-address is utilized to set up an interface to expect and receive broadcasts. By default, Cisco routers do not forward broadcasts to prevent broadcast storms that can easily disrupt a network. This is especially common in large, flat network designs indicative of legacy network environments. One of the most common situations is when a Dynamic Host Configuration Protocol (DHCP) client attempts to get configuration information from a DHCP server on the other side of a router in another broadcast domain. Unless a DHCP service or relay ...
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