Ip dhcp pool dhcp_pool <- Name of DHCP pool Ip helper-address 100.100.100.2 <- Pointing to Remote DHCP Server The "ip helper-address" command makes the router to forward BOOTP broadcast packets to the specific remote DHCP server. Because DHCP clients use bootp packets that are broadcasted to all hosts(255.255.255.255) and it will be all dropped by the router. By default, router drop all the broadcast packtes sent thru the router. Where do you think the "IP helper-address" command needs to be inplace for DHCP client in remote? Answer is Ethernet interface of New York router. – As you can see below diagram, there are a DHCP server and two DHCP clients that one is in local and other is in remote. The below example might not be realistic, b/c I just made up a case to better understand this technology. In this article, we will mainly discuss about how to use IP helper-address to connect a remote DHCP server. For example, communicating between old computers that is using NetBIOS protocols, connecting remote DHCP server. As you know IP helper-address is required a network is connected certain application at remote. Once in a while, I see " IP helper-address" command for broadcast applications such as DHCP client(BOOTP), NetBIOS and so on.
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