Thats because the Netsh DHCP Helper is installed when you add the DHCP. The most common use for the helper address is for clients running DHCP, which remote servers assign IP addresses and subnet masks usually performed locally through a broadcast to be served remotely with a unicast (one) packet. NOTE: Replace ipaddr with the static IP address, subnetmask with the subnet mask. Dynamic Host Configuration Protocol (DHCP). The IP helper address forwards packets that are normally discarded by default to the following services: You can configure more than one helper address per interface on a Cisco router. The command to enable an IP help address is as follows: To configure an IP helper address youll use the ip helper-address a.b.c.d in interface configuration mode on the interface that is connected to the. So to allow the ability to forward packets wisely, you can use the IP helper address command to convert a broadcast into a more specific destination address. To save on bandwidth, all Cisco routers installed with Cisco Internet Operating System (IOS) software by default have an algorithm that dictates that not all broadcast packets be forwarded. In an IP network, you use the IP helper address to change a broadcast into a more specific destination address so not all devices must view the IP data, which conserves bandwidth. Broadcasts on any network consume CPU and bandwidth to reduce this even more. Layer 3 of the TCP/IP model, IP also uses broadcasts for such services as sending IP datagrams to all hosts on a particular network. In a Layer 2 environment, you use broadcasts to find an end system's MAC address. As in any network, broadcasts are used to find and discover end systems.
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