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3 Comments on “The ip helper-address command does what?”

  1. ish says:

    The Dynamic Host Configuration Protocol (DHCP) is a standardized network protocol used on Internet Protocol (IP) networks for dynamically distributing network configuration parameters, such as IP addresses for interfaces and services. With DHCP, computers request IP addresses and networking parameters automatically from a DHCP server, reducing the need for a network administrator or a user to configure these settings manually

    The Cisco IOS DHCP relay agent will be enabled on an interface only when the ip helper-address command is configured. This command enables the DHCP broadcast to be forwarded to the configured DHCP server.




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    1. Pekovic says:

      ip helper-address command to relay broadcast requests for these key User Datagram Protocol (UDP) services.

      By using the ip helper-address command, a router can be configured to accept a broadcast request for a UDP service and then forward it as a unicast to a specific IP address




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  2. Pekovic says:

    You can implement an IP Helper address to forward Dynamic Host Configuration Protocol (DHCP) broadcasts on to their appropriate destination. In this way, you can implement a single DHCP server as one management point where you can check the leases for any device on your network and manage all the IP subnets on your network.
    Each subnet that does not have its own DHCP server will be configured with an ip helper-address command. The configuration for this command follows; note that you first must change the router interface to which you will be assigning the helper.
    Router2>enable
    Password:
    Router2#configure terminal
    Enter configuration commands, one per line. End with CNTL/Z.
    Router2(config)#interface fastEthernet 0/1
    Router2(config-if)#ip helper-address global 192.168.1.8
    Router2(config-if)#exit
    Router2(config)#exit




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