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Ip helper address vs DHCP server

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  • 1.  Ip helper address vs DHCP server

    Posted Oct 14, 2021 01:47 AM
    Hello team,
    Can anyone please explain what is the difference between DHCP server vs ip helper address.

    Shivam Ojha

  • 2.  RE: Ip helper address vs DHCP server

    Posted Oct 14, 2021 03:17 AM
    Not sure why you posted this to the Aruba Apps forum.

    A DHCP server is a service that hands out IP addresses to clients on the network. This DHCP service can run on (most) switches/firewalls/controllers, where the switch has a range of IPs that it can hand out to clients.

    If you have multiple subnets, it may make sense to run that DHCP service on a central server in your network, like your AD server (which has a built-in DHCP server), or a dedicated IPAM solution. In that case, you configure an ip-helper (which is the same as a DHCP Relay, which may be a better term for understanding) on the switch/firewall/controller that forwards the DHCP requests from the clients to the central DHCP server, and responds with what it receives back from the DHCP server. The switch itself does not keep an administration of IP addresses.

    My personal opinion is that you should use a central DHCP server (and ip-helpers/DHCP relay on the switches), unless there is a good reason to do local DHCP.

    Herman Robers
    If you have urgent issues, always contact your Aruba partner, distributor, or Aruba TAC Support. Check for how to contact Aruba TAC. Any opinions expressed here are solely my own and not necessarily that of Hewlett Packard Enterprise or Aruba Networks.

    In case your problem is solved, please invest the time to post a follow-up with the information on how you solved it. Others can benefit from that.

  • 3.  RE: Ip helper address vs DHCP server

    Posted Feb 18, 2022 12:55 AM
    IP helper address: It's the address of DHCP server located in another LAN from which hosts, DHCP request will be answered. DHCP relay is used to forward DHCP broadcast requests on LAN as a unicast packet to a central server, while ip helper-address is the command used to enable DHCP relay in routers.

                                                                                                                                                                                                            ACE Flare Account

    Wendell Schaefer

  • 4.  RE: Ip helper address vs DHCP server

    Posted May 17, 2022 12:57 PM
    They are same thing, but different vendors. Helper Address is the one you use in Cisco routers while Relay Agent is configured in Windows Server.
    They perform the same functionality… Unicast the broadcast DHCP traffic to the right DHCPserver in a different subnet.

    Gilbert Martin